Some Physical Properties of SBR/NBR Rubber Blends-Loaded …19)1-10.pdf · 2019-09-21 · blending process is to combine the properties of two or more individual rubbers together

Journal of. Modern Trends in Physics Research

Online ISSN 2636-4220

DOI: 10.19138/mtpr/(19)1-10 Accepted: 2019-09-01

Hafez, M. Hafez; A. S. Doma; A.Y. Zanaty; A. S. Abdel-Rahman; S.A. Khairy; H. H. Hassan (2019). Some Physical Properties of SBR/NBR

Rubber Blends-Loaded with Nano-Sized Black Fillers, J. Modern Trends in Phys. R., Vol. 19 (MTPR-18) pp. 1-10

https://doi.org/10.19138/mtpr/(19)1-10 1

Some Physical Properties of SBR/NBR Rubber

Blends-Loaded with Nano-Sized Black Fillers

M. Hafez1, A. S. Doma2, A.Y. Zanaty1, A. S. Abdel-Rahman1, S.A. Khairy1, H. H. Hassan1

1 Physics Department, Faculty of Science, Cairo University, Giza, Egypt. 2 Polymeric Materials Research Dep., Advanced Technology and New Materials Research Institute (ATNMRI), City of Scientific

Research and Technological Applications (SRTA-City), New Borg El-Arab City 21934, Alexandria, Egypt.

Abstract- Different blends of SBR/NBR compatibilized by butadiene rubber (BR) were prepared according to the

well-known standard methods. The modified blends of unfilled SBR/NBR was characterized on the basis of the effect

of blend ratio by curing parameters, mechanical characteristics, abrasion resistance, compression set and swelling

properties. It was found that SBR/NBR blends showed comparatively better mechanical properties compared to each

rubber individually. Curing parameters e.g. low torque (ML) and high one (MH) were increased, while a reduction in

the curing and scorch times were decreased with increasing SBR ratio in the blend. Results revealed that, the increase

of SBR content results in an enhancement of tensile strength (TS) and elongation at break (Eb). The effect of blend

ratio showed a peak value for (TS) & (Eb) at 50SBR/50NBR. For that, two types of carbon blacks, N220 and N774

were incorporated with the optimum blend ratio (50SBR/50NBR) by different concentrations. The effect of carbon

blacks on the mechanical characteristics, hardness, abrasion resistance, compression test and even the swelling test in

benzene have been discussed according to the recent current theories.

Correspondence Author – H. H. Hassan ([email protected])

Keywords- SBR/NBR blends; (BR) Compatibilizer; Mechanical properties; Hardness; Abrasion resistance;

Compression set; Swelling test; N220 black; N774 black.

1. INTRODUCTION

Rubbers gain great important regarding industry due to its various applications, such as cables and tires. This is

owing to their light weight, high flexibility, hydrophobicity, low cost and easy manufacturing. The main target of

blending process is to combine the properties of two or more individual rubbers together in one single material. As a

result, we have a great enhancement in mechanical properties, processability, and low-cost product [1-4]. Physical

properties of vulcanized rubber blend are highly dependent on its morphology and distribution between the two

participating phases of the blend constituents. Introducing the compatibilizer component in the form of

macromolecule is to ensure adhesion between the two phases in order to decrease interfacial tension and enhance the

mechanical and physical properties of the host material [5–7]. Styrene butadiene rubber (SBR) is one of the best

synthetic rubbers, especially in tyre production industry, due to its good abrasion and crack resistance [8]. In the other

hand, NBR is a polar elastomeric possessing high oil resistance but with bad mechanical properties when compared

to SBR. Therefore, during the last decade, physical blending of SBR and NBR have gained great attention in industry [9]. SBR/NBR blend is considered as a compatible blend due to the fact that the styrene in SBR and the nitrile groups

in NBR could form a donor-acceptor system which produces ease compatibility. Mansour et al. [10], have investigated

the effect of unsaturated polyester as compatibilizer on SBR/NBR blends, while Ramesan et al. found that Blends of

SBR and NBR are to be immiscible and its compatibility can be achieved by using dichlorocarbene modified (DCSBR)

as a compatibilizer. In addition, the effect of DCSBR on cure characteristics, swelling behaviour, mechanical

properties, oil resistance and air ageing behaviour is also studied [11]. The addition of black filler in the form of

aggregations to a rubber increases the reinforcement , improves the mechanical properties of the final matrix, and also

decreases its cost [12-14]. The objective of the present work is to introduce a useful technique for producing polymeric

composites based on SBR and NBR rubber blends filled with different concentration of conductive carbon blacks and

testing their physical characteristics. We compare the physical properties and physico-chemical properties of the

polymeric matrix in order to study the effect of the structure of two different sizes of blacks on the carbon black loaded

SBR /NBR composites.

https://doi.org/10.19138/mtpr/(19)1-10

http://www.mtpr.pub/

mailto:[email protected]

Journal of. Modern Trends in Physics Research Online ISSN 2636-4220





2. EXPERIMENTAL PROCEDURES

2.1. Materials

1. The following raw materials were donated from Transport and Engineering Co. (TRENCO), Alexandria, Egypt.

2. SBR (SBR-1502, styrene content 23.5%, Sp.Gr. 0.945).

3. NBR (NBR-Perbunan, Bayer AG., Germany, acrylonitrile content 34%, Sp.Gr. 0.99).

4. Polybutadiene rubber (BR) was supplied by Bayer AG Germany.

5. The carbon blacks used in this work are N220 (ISAF) and N774 (SRF) from Birla Carbon Egypt Co.(BCE),

Alexandria, Egypt.

6. Other chemicals such as zinc oxide, stearic acid, N-(1,3-Dimethylbutyl)-N-phenyl-p-phenylenediamine (6PPD),

mercaptobenzothiazyl disulfide (MBTS), processing oil, DOP and sulphur were used in commercial grades

without purification and locally manufactured by ADWIC Co., Egypt.

2.2. Blend Preparation

The preparation of 11 formulations of SBR/NBR blends were carried out according to ASTM D 3185 – (99) [15]. All

the rubber ingredients were accurately supplied, weighed and mixing on a two-roll mill at TRENCO Company,

Alexandria, Egypt, with the following dimensions: diameter 460 mm, working distance 300 mm, speed of the slow

roll 16 rpm and gear ratio 1.4. The mill has the facility of rolling temperature control.

First stage (mastication process): the mill nip was adjusted at 3 mm wide then the raw SBR introduced into the mill

nip many times without any stripping. This is important to soften the SBR before adding further chemical additives.

Then BR as a compatibilizer is incorporated for 3 minutes and finally NBR for 5 min. After mastication, a slightly

increase in the dispersion of ingredients was observe due to ease processing the (mastication time, around 2 min).

Second stage: zinc oxides and stearic acid were added gradually to the blend (compounding time, 4 min), then, the

rest of chemical additives were added (compounding time ~ 10 minutes). Finally, the accelerator and sulfur were

gradually added into blend in order to prevent pre-vulcanization which may occur due to the increase of temperature.

In addition, the rubber compounds were roll at opening mill nip stepwise until a thickness of 3 mm is reached. The

total mixing process was achieved at almost 35 minutes. The blend compositions are listed in table 1. The optimum

curing time was obtained by using MDR-2000 rheometer with about 5 g samples of the respective rubber blends.

Before all tests, all rubber blends were vulcanized using a curing hot press at 153 ± 2 0C for 15 minutes and pressure

of 15 MPa by means of standard dies in accordance with ASTM D-3191 standard [16].

Table 1. Recipe of SBR/NBR blends.

Chemical aingredient(phr)

S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 S11

SBR 100 90 80 70 60 50 40 30 20 10 0

NBR 0 10 20 30 40 50 60 70 80 90 100

BR --- 10 10 10 10 10 10 10 10 10 ---

ZnO 5 5 5 5 5 5 5 5 5 5 5

Stearic acid 2 2 2 2 2 2 2 2 2 2 2

Processing oil 0 1 2 3 4 5 6 7 8 9 10

DOPᵇ 10 9 8 7 6 5 4 3 2 1 0

6PPD4020 ͨ 1 1 1 1 1 1 1 1 1 1 1

MBTS ͩ 2 2 2 2 2 2 2 2 2 2 2

S 2 2 2 2 2 2 2 2 2 2 2

a) Part per hundred parts of rubber by weight

b) Dioctyl Phthalate

c) N-isopropyl-N'-phenyl-p-phenylene diamine (antioxidant, antiozonant, and antiflex)

d) Methylebenzthiazyle disulfide (accelerator)








The mechanical properties of above blends exhibit maximum values for 50SBR/50NBR blend. This optimum value

was loaded with different ratios of carbon blacks N220 and N774 as shown in tables 2 and 3 respectively.

Table 2. Recipe of N220/50SBR/50NBR composites.

Table 3. Recipe of N774/50SBR/50NBR composites.

2.3. Mechanical properties

The mechanical properties of unfilled and filled SBR/NBR blends were measured on a Monsanto tensometer of

capacity 10 kN and a cross head speed of 400 mm/min using dumbbell-shaped tensile specimens according to

ASTMD-412 [17] at room temperature. Specimens prepared by cutting three individual dumbbell shape specimens

from the polymeric sheet samples by a steel die of constant width (4 mm) and (115 mm) between the two dumbbells.

The hardness measurements were performed by a durometer Shore A (ASTM D-2240) [18] and the readings were

taken by hand-time for 20 sec.

The abrasion resistance for rubber was performed according to (ASTM D53516) [19] using Zwick abrasion tester

model 6102.

The compression set (ASTM D395) [20] was achieved on standard test specimen of cylindrical shape of 25 ± 0.1 mm

diameter and 12 ± 0.1 mm thickness.

2.4. Physicochemical properties (Swelling test)

Strips of dimensions 0.2x0.5 x 2 cm3 were immersed in benzene at room temperature for 24 hours. The maximum

degree of swelling is measured using the following relation

𝑄𝑚

(%) =𝑀𝑠−𝑀𝑑

𝑀𝑑

∗ 100 (1)

Where Ms and Md are the masses of swell and dry piece of rubber, respectively. The mass of the sample was measured

by electronic digital balance of 0.001 gm accuracy.

Sample ingredients (phr) I-0 I-10 I-20 I-30 I-40 I-50 I-60 I-70 I-80 I-90 I-100

SBR 50 50 50 50 50 50 50 50 50 50 50

NBR 50 50 50 50 50 50 50 50 50 50 50

BR 10 10 10 10 10 10 10 10 10 10 10

ZnO 5 5 5 5 5 5 5 5 5 5 5

Stearic acid 2 2 2 2 2 2 2 2 2 2 2

Processing oil 5 5 5 5 5 5 5 5 5 5 5

DOP 5 5 5 5 5 5 5 5 5 5 5

N220 (ISAF) --- 10 20 30 40 50 60 70 80 90 100

6PPD 1 1 1 1 1 1 1 1 1 1 1

MBTS 2 2 2 2 2 2 2 2 2 2 2

S 2 2 2 2 2 2 2 2 2 2 2

Sample ingredients (phr) S-0 S-10 S-20 S-30 S-40 S-50 S-60 S-70 S-80 S-90 S-100

SBR 50 50 50 50 50 50 50 50 50 50 50

NBR 50 50 50 50 50 50 50 50 50 50 50

BR 10 10 10 10 10 10 10 10 10 10 10

ZnO 5 5 5 5 5 5 5 5 5 5 5

Stearic acid 2 2 2 2 2 2 2 2 2 2 2

Processing oil 5 5 5 5 5 5 5 5 5 5 5

DOP 5 5 5 5 5 5 5 5 5 5 5

N774(SRF) --- 10 20 30 40 50 60 70 80 90 100

6PPD 1 1 1 1 1 1 1 1 1 1 1

MBTS 2 2 2 2 2 2 2 2 2 2 2

S 2 2 2 2 2 2 2 2 2 2 2








3. RESULTS AND DISCUSSION

3.1. Effect of blend ratio on the curing parameters of SBR/NBR blend.

Table 4 summarizes the rheological characteristics of pure SBR/NBR blends. The obtained data show that the

increase of SBR content results in an increase of minimum torque (ML) and maximum one (MH). In other words, ML

which reflects the minimum viscosity of the blends is affected by the increasing amount of SBR content. These results

are in good agreement with the obtained results of Ahmed et al. [21]. Furthermore, the dependence of the optimum cure

time (t90) and scorch time (tsc) is observed. The decreasing trend may be attributed to the presence of NBR content in

blends, which increases the reactive sites, decreases the time for cross linking in rubber blends to occur.

Table 4. The curing parameters of SBR/NBR blend.

Blend Ratio ML (dNm) MH (dNm) tsc(min) t90 (min)

0SBR/100NBR 0.82 1.02 1.93 2.89

10SBR/90NBR 0.95 1.60 1.84 2.76

20SBR/80NBR 1.45 5.70 1.72 2.53

30SBR/70NBR 2.36 12.30 1.68 2.42

40SBR/60NBR 2.50 13.40 1.44 2.34

50SBR/50NBR 3.50 14.70 1.31 2.25

60SBR/40NBR 3.75 17.20 1.22 2.10

70SBR/30NBR 4.20 18.50 1.10 1.90

80SBR/20NBR 4.80 19.10 0.89 1.80

90SBR/10NBR 5.00 20.32 0.73 1.76

100SBR/0NBR 5.03 22.50 0.49 1.72

The low value observed for tsc and t90 could attribute to the high temperature (180 C) which fixed for the rheometer at

TRENCO-Alexanderia. For this the data in table 4 are used only for comparison.

3.2. Mechanical properties

3.2.1. True stress–true strain characteristics of SBR/NBR blends.

The stress-strain curves of the SBR/NBR blend compatibilized by BR are shown in fig. 1. At larger deformations there

are moderate extensibility of the cross-linked chains. However, there is a different stress-softening effect at moderate

strains, especially for higher loaded samples with SBR. It is clear that the optimum value of stress is observed for the

composition 50SBR/50NBR with a stress of 10MPa. The mechanical parameters, in terms of tensile strength (TS),

young modulus and elongation at break (Eb), were determined from fig. 1 and the results were tabulated in table 5.

The marked increase of tensile strength (TS) may be attributed to the increase in SBR content which leads to a strong

dipole-dipole interaction between SBR and NBR molecules. In addition, the higher modulus and elongation may be

owed to the increase of the cross-linking density which is in good agreement with the curing parameters results.

Table 5. The mechanical parameters of SBR/NBR blends.

Blend Ratio TS (MPa) Modulus of elasticity(MPa) Eb

0SBR/100NBR 4.60 2.23 0.85

10SBR/90NBR 5.70 1.83 1.22

20SBR/80NBR 6.30 1.59 1.49

30SBR/70NBR 7.15 1.6 1.55

40SBR/60NBR 8.75 1.77 1.75

50SBR/50NBR 10.10 2.19 1.85

60SBR/40NBR 9.40 2.04 1.75

70SBR/30NBR 8.60 1.49 1.80

80SBR/20NBR 7.47 1.28 1.72

90SBR/10NBR 5.82 1.21 1.70

100SBR/0NBR 3.30 1.18 1.35








Fig. 1. True stress-true strain curves for SBR/NBR compatibilized with BR.

It is noticed from the above table that a marked peak was observed at 50SBR/50NBR blend .this optimum ratio attract

our attention to extend our study on this optimum by adding different concentration from two types of carbon black,

N220 (ISAF) and N774 (SRF). These blacks have different physical and chemical properties, and this will be discussed

in detail in section 3.3.

In order to complete the study on the above pure blends a set of different measurements have been done such as, the

hardness, abrasion resistance, compression set and swelling test as shown in table 6.

Table 6. Hardness, abrasion resistance, compression test and maximum degree of swelling for SBR/NBR blends.

Blend Ratio Hardness (Shore A) Abrasion loss (%) Compression set (%) Qmax (%)

0SBR/100NBR 54 0.80 1.21 240

10SBR/90NBR 45 1.5 1.61 246

20SBR/80NBR 43 1.8 3.42 251

30SBR/70NBR 43 2 4.5 284

40SBR/60NBR 42 2.4 4.91 316

50SBR/50NBR 31 2.7 6 324

60SBR/40NBR 41 2.6 4.1 340

70SBR/30NBR 40 2.3 2.96 366

80SBR/20NBR 38 2.1 2.83 354

90SBR/10NBR 38 2.0 2.02 369

100SBR/0NBR 37 1.9 1.62 371

The hardness of SBR/NBR blends exhibits a minimum value for 50SBR/50NBR blend. The variation of the abrasion

loss for SBR/NBR blends shows that all samples exhibits a peak value for 50SBR/50NBR sample .A decreasing trend

could be observed for the values of degree of swelling in benzene (Qmax(%)) against NBR content. The marked

decrease of Qmax (%) may be attributed to the fact that swelling is strongly depend on the chemical nature of the

0

2

4

6

8

10

12

0 0.5 1 1.5 2

Tru

e st

ress

(M

Pa)

True strain

SBR0/NBR100

SBR10/NBR90

SBR20/NBR80

SBR30/NBR70

SBR40/NBR60

SBR50/NBR50

SBR70/NBR30

SBR60/NBR40

SBR80/NBR20

SBR90/NBR10

SBR100/NBR0








vulcanized elstomer. The presence of polar group or methyl group in polymer molecule reduce the permeability to a

given liquid therefore NBR have low values of the penetration rate (p)and diffusion coefficient (D) when compared

with SBR [22].

3.3. Carbon black-loaded rubber blends.

The optimum blend (50SBR/50NBR) which was selected from previous sections 3.1, 3.2 was incorporated with

different concentrations of N220 black and N774 black separately and will discussed in the following sections 3.3.1,

3.3.2.

3.3.1. Effect of N220 black content on the vulcanization characteristics and mechanical properties of

50SBR/50NBR blend.

a) vulcanization characteristics

The cure characteristics of N220 filled 50SBR/50NBR composites are shown in table 7. It is noticed that, the values

of ML, MH will increase with the increase of N220 content. This due to the fact that rubber chains contact with carbon

black particles and entangle or trap in the voids between carbon black aggregates [23]. The addition of N220 increases

the formation of aggregations which have weak physical bond. As a result, it leads to a deformation of carbon black

structure.

Table 7. The curing parameters of N220 black filled 50SBR/50NBR composites.

Blend Ratio N220 content (phr) ML (dNm) MH (dNm) Tsc (min) T90 (min)

50SBR/50NBR

0 3.50 14.70 1.31 2.25

10 4.65 10.13 2.06 3.20

20 5.12 12.65 2.00 3.05

30 5.64 13.60 1.89 2.98

40 6.72 14.33 1.67 2.68

50 7.35 15.20 1.52 2.55

60 8.12 16.45 1.32 2.30

70 9.34 18.30 1.21 1.87

80 10.7 22.56 0.89 1.70

90 11.34 23.90 0.54 1.45

100 12.72 25.30 0.34 1.03

Finally, T90&Tsᴄ decrease with increasing N220 content. This is due to the increasing of crosslinking density by

increasing carbon black concentration in the polymer matrix.

3.3.1.1. b) Mechanical properties

The true stress-true strain characteristics for 50SBR/50NBR which loaded with different concentration of N220 carbon

black is shown in fig. 2. The variation of TS, modulus of elasticity and elongation at break values are listed in table 8.

Table 8. The mechanical and physico-chemical parameters of N220 black-loaded 50SBR/50NBR composite.

N220

content

TS (MPa) Modulus of

elasticity(MPa)

Eb Hardness

(Shore A)

Abrasion test

(%)

Compression

Set( %)

Qmax (%)

0 9.5 1.245 1.37 36 2.640 6 324

10 2.7 0.790775 1.42 42 2.433 2.06 108

20 4.1 2.167898 1.55 46 1.996 1.80 93

30 14.5 1.054711 1.68 50 2.037 1.69 86

40 20.3 1.338941 1.79 56 1.964 1.54 79

50 23.4 1.692494 1.81 61 1.843 1.53 72

60 22.1 2.157396 1.71 65 1.802 1.47 65

70 20.8 3.650405 1.32 70 1.664 1.36 58

80 14.2 3.27587 1.25 74 1.656 1.29 55

90 13.9 4.524889 1.23 77 1.512 1.00 52

100 10.8 5.567052 1.08 81 1.355 0.46 49








Fig. 2. True stress-true strain curves for 50SBR/50NBR loaded with N220 black content.

Table 8 summarizes all the mechanical and physico-chemical parameters of N220/(50SBR/50NBR)composites .it is

clear that the tensile strength exhibits a peak value at 50phr of N220. This peak could be results from two mechanisms;

first one is the increase of tensile strength due to the increase of carbon black content which results in reinforcement

of the polymeric matrix. This effect reaches its maximum value at 50 phr of N220 above which the further increase

of carbon black of very small particles size form a weak aggregation structures of weak Van der Walls forces which

lead to the decrease of tensile strength [24-25].

Hardness values , Abrasion resistance, and compression set show a remarkable increase with the increase of carbon

black content.

The max degree of swelling will decrease with the increase of N220 loaded the SBR50/NBR50 blend at different

concentration. The presence of carbon black appears to restrict the diffusion of solvent into the elastomers, since the

elastomeric network becomes stiffer with the addition of filler [26].

3.3.2. Effect of N774 black content on the vulcanization characteristics and mechanical properties of

50SBR/50NBR blend.

3.3.2.1. Vulcanization characteristics

Table 9 summarizes the curing parameters of 50SBR/50NBR loaded with different concentration of N774 black. It is

noticed that the addition of carbon black results of a marked increase in ML, MH but obvious decrease in t90&tsᴄ.This

is due to the increase of cross linking density of the polymer matrix due to further addition of N774 black which reduce

the time of vulcanization.

Table 9. The curing parameters of N774 black filled 50SBR/50NBR composites.

Blend Ratio N774 content(phr) ML (dNm) MH (dNm) Tsc(min) T90

(min)

50SBR/50NBR

0 3.50 14.70 1.31 2.25

10 6.25 12.13 2.17 4.65

20 6.42 12.65 2.01 4.05

30 6.64 14.61 1.89 3.88

0

5

10

15

20

25

0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2

Tru

e st

ress

(MPa

)

True strain

50SBR/50NBR+10N220SBR50/NBR50+20N220SBR50/NBR50+30N220Sbr50/NBR50+40N220SBR50/NBR50+50N220SBR50/NBR50+60N220SBR50/NBR50+70SBR50/NBR50+80N220SBR50/NBR50+90N220SBR50/NBR50+100N220SBR50/NBR50








40 8.72 14.73 1.46 3.68

50 8.95 16.20 1.33 3.45

60 9.12 16.48 1.20 3.32

70 9.34 18.30 1.01 2.87

80 10.7 20.56 0.98 2.70

90 12.36 24.90 0.89 1.53

100 15.76 26.40 0.45 1.23

3.3.2.2. Mechanical properties

The true stress-true strain behavior for the investigated 50SBR/50NBR loaded with different concentration of N774

is shown in fig. 3.

Fig. 3. True Stress-truestrain curves for N774 black loaded 50SBR/50NBR composites.

Table 10 illustrate the variation of mechanical parameters of N774 black loaded 50SBR/50NBR composites which

could be obtained from fig. 3 . It is clear that the tensile strength exhibits a peak value at 80phr of N774. the observed

increase in tensile strength is due to the interaction between filler and rubber matrix [27] in other word TS increase as

a result of the reinforcement of the polymer matrix and its degree depend upon the interaction between the filler and

rubber matrix .The increase of N774 content results in an increase of the interactive force and the degree of

reinforcement [28] the reduction of Eb is related to the increase of stiffening of the rubber matrix by increasing N774,the

addition of N774 enhances the hardness but there is an obvious decrease in abrasion resistance and compression set

values by comparison with N220 . The max degree of swelling will decrease with the increase of N774 loaded the

SBR50/NBR50 blend at different concentration.

Table 10. The mechanical and physio-chemical parameters of N774 black loaded50SBR/50NBR composites.

Blend Ratio TS

(MPa)

Young Modulus

(MPa) Eb

Hardness (Shore

A)

Abrasion

loss(%)

Compression

Set( %)

Qmax

(%)

0SBR/100NBR 9.51 1.245 1.82 36 2.64 6 324

10SBR/90NBR 3.59 1.071561 1.40 41 2.513 3.683809998 87

20SBR/80NBR 4.61 1.22397 1.35 45 2.493 3.538533928 91

30SBR/70NBR 5.71 1.365045 1.27 47 2.327 3.441534009 85

40SBR/60NBR 6.39 1.652832 1.25 51 2.432 3.346100348 90

50SBR/50NBR 7.96 2.316954 1.08 53 2.187 3.221010197 81

60SBR/40NBR 8.06 2.556851 1.18 56 1.882 2.821753713 72

70SBR/30NBR 10.70 2.771271 1.19 61 2.610 2.637359961 63

80SBR/20NBR 13.71 2.909669 1.51 63 2.018 2.534719711 62

90SBR/10NBR 9.48 2.78896 1.43 64 2.490 2.253968254 61

100SBR/0NBR 14.12 2.363156 1.37 70 2.273 1.896512936 52

0

2

4

6

8

10

12

14

16

18

0 0.5 1 1.5 2 2.5

Tru

e St

ress

(M

Pa)

True Strain

SBR50/NBR50+10N774

SBR50/NBR50+20N774

SBR50/NBR50+30774

SBR50/NBR50+40N774

50SBR/50NBR+50N774

50SBR/50NBR+60N774

SBR50/NBR50+70N774

SBR50/NBR50+80N774

SBR50/NBR50+90N774

SBR50/NBR50+100N774

SBR50/NBR50








4. CONCLUSION

It could be concluded from this work that,

1. The optimum rubber blend for SBR/NBR was selected due to the peak value of TS&Eb observed at 50SBR/50NBR

rubber blend using 10 phr of BR as a comptalizer .

2. The addition of N220 increase the tensile strength to peak value 50 phr after this value the breakdown of carbon

black aggregation increases.

3. The same behavior was observed for N447 with a characteristics peak of tensile strength at 80 phr .

4. The abrasion resistance will be increase with the increase of carbon blacks’ content N220 and/or N774 .

5. The hardness of samples will be increase with the increase of carbon blacks’ content N220 and/or N774.

6. The swelling value will decrease with the carbon black content.

7. The composite will gain good compression value with the increase of carbon black content.

8. A marked decrease in ML&MH with an increase in Tsc(min) &T90 (min).

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Some Physical Properties of SBR/NBR Rubber Blends-Loaded …19)1-10.pdf · 2019-09-21 · blending process is to combine the properties of two or more individual rubbers together