POLYBUTADIENE

Mohsin Hussain

M14-341

5th Semester (Morning)

College of Engineering & Emerging Technologies

University of the Punjab

OBJECTIVES

• What is Polybutadiene?

• Monomer & polymerization method

• Processing techniques & types

• Properties

• Applications

• Research articles

• Conclusion

INTRODUCTION

In 1910 , it was firstly polymerized by a Russian chemist named Sergei Lebedev.

Polybutadiene is an elastomeric synthetic rubber and a homopolymer of 1,3 Butadiene

monomer. Due to it’s high abrasion(wear) resistance, it is accounted for approximately a

quarter of total consumption of synthetic rubber in 2012. About 70 % of this polymer is used

in the manufacturing of tires and rest of it used to increase the mechanical strength of

plastics and other polymers.

Monomer

Molecular Formula C4H6

Polymerization reaction

Polymerization methods Grades of BR

Free Radical

Cationic & Anionic

Coordination

LiBR

BR-1243 Nd

CoBR

NdBR

BR-1203 Ti

Types Processing techniques of BR

• Global production of butadiene reached 10 million metric tones (20.4 billion pounds)

in 2011.

High Cis Polybutadiene

Low Cis Polybutadiene

High Trans Polybutadiene

Lithium based Polybutadiene

Metallocene Polybutadiene

High Vinyl Polybutadiene

Injection Molding

Compression Molding

Transfer Molding

Extrusion

Solution Polymerization

Physical Properties Limitations

Melting point 124-156 ºC

Hardness 45-80 shore A

Tg <-95 ºC

Td Above 300ºC

Crystallinity 18.6 %

Elongation 450 %

Abrasion

resistance

Good

Chemical

resistance

Excellent

Density 0.6145 g/cm³

Mn >100,000 g/mol

Poor resistance to

oil and gasoline

Minor resistant to heat

Difficult to process

Prone to ozone

cracking

COMMERCIAL AVAILABILITY OF BR

• Global demand and usage of BR

• World consumption of BR in 2015

• Available in the form of gas but stored and used in pressurized

liquefied form.

APPLICATIONS AND USES

• Tire production (SBS)

• Conveyor belt

• Water hoses

• Gaskets

• Golf ball & super ball

• Engine belt

• As fuel in space shuttle for boosting rockets

Sepiolite is a porous mineral exist in the form of fibers and

prepared by dry flow method. Average diameter of sepiolite is

less than 100 nm.

Coupling agents like NDZ-201 (Isopropyl tri (dioctylphosphate)

titnate) and KH-560 (ᵞ-(2,3 epoxypropoxy)

propyltrimethoxysilane) are used with Cis-PBR as fillers .

Dumbbell shape samples were prepared and tested under at

UTTM.

From study, NDZ-201 had best tearing strength but low tensile

strength whereas KH-560 had best tearing strength as well as

best tensile strength.

Therefore KH-560 was considered an optimal coupling agent as

in the given graph at 7% it shows maximum tensile strength.

Application Sepiolite increases the mechanical strength of

Cis- PBR.

Author

Fei Wang,

Lei Feng

and

Haifeng Liu

Journal

Journal of

Nanomateri

als

Issue Date

November

2013

Effect of modified sepiolite nanofibers on properties of cis-

polybutadiene rubber composite nanomaterials

• In the presence of potassium persulfate,

disproportionate rosinate potassium emulsifiers and t-

dodecyl mercaptane as initiator for polymerization.

• Conversions were measured at different temp. (60,70 or

80ºC) by gravimetry method.

• Particle size was calculated through DLS and polymer

microstructure through FTIR.

• By increasing temp. diameter of PB nanoparticles

decreased from 104 nm at 60ºC to 88.7 nm at 80ºC.

• Microstructure of synthesized polymers was calculated

to about 60%.

• Result By increasing reaction temp. size of particles

decreased while the polymerization rate increased.

Synthesis of Polybutadiene Nanoparticles via Emulsion

Polymerization

AuthorMohammad

Reza

Yosoufi and

Parisa

Alamdari

JournalOil, Gas and

Petrochemic

al

Technology

Issue DateDecember

2013

Vol 1

CONCLUSION

Polybutadiene is and will continue to be a high volume rubber for use in tires, toughened

plastics, and golf balls due to its low cost, availability and unique properties. As new

markets develop, there will be a need to develop new, higher performance grades of BR.

Thankyou for listening :D

Keep Calm and Don’t ask any Question