Vol. 55, No. 2, p. 85912009
1
Physical Properties and Wood Bonding Performance of Polyvinyl
Alcohol with Addition of Montmorillonite1
Hirotaka YOSHIZAWA2, Masaaki YAMADA2 and Kinji TAKI2
To improve the heat resistance of an aqueous vinyl polymer
solution-isocyanate adhesive API, we examined the film properties
and the wood bonding performance of polyvinyl alcohol PVA, which is
generally used as a base polymer for API, with addition of
montmorillonite, a form of clay. We measured the viscosity of the
PVA solution with addition of montmorillonite in terms of the time
required for mixing, the dynamic viscoelasticity, and the X ray
diffraction of a film made from the PVA solution with addition of
montmorillonite. The viscosity of the PVA/ montmorillonite solution
increased with increasing mixing time. Xray diffraction analysis
showed that the layer of montmorillonite expanded after mixing with
PVA. These properties demonstrated that the interaction between PVA
and montmorillonite increased after mixing the two compounds. The
storage modulus at high temperatures of the PVA/montmorillonite
mixture was ten times that of PVA alone. In wood bonding, the bond
strength of the PVA/ montmorillonite mixture increased at high
temperatures. These results show that adding montmorillonite to PVA
increases the heat resistance of the adhesive.
Keywords : montmorillonite, PVA, heat resistance, dynamic
viscoelastic property, wood bonding performance.
API API PVA PVA PVA PVA PVA 10
1 Received May 28, 2008 ; accepted July 11, 2008. 2 Faculty of
Agriculture, Shizuoka Uni-
versity, Shizuoka 4228529, Japan
1992
1998
API
PVA8030
20
600 rpm70
No. 34
2010 rpm
abrpm
2.3 2.3.1 PVA10 MA2.2
48
0.1 mm
CuKα40 mA40 kV 2θ/θ
1°30° 1°/min
1 deg 1 deg0.3
mm
3/min230
80 mmL×24 mmR×5 mmT
Betula Maximowicziana REGEL
0.7024 mm×15 mm
280300 g/m2
2065
RH2460
MA
PVAMA
Fig. 1. The relationship between stirred time and visocosity of PVA
solution added to montmorillonite.
Fig. 2. The relationship between stirred time and TI value of PVA
solution added to montmorillonite.
88 Vol. 55, No. 2
PVA
PVA
MA PVA
PVA
E′
E′
MA PVA
Fig. 3. Xray diffraction analysis of montmorillonite tablet, PVA96
film and PVA96/montmorillonite film stirred at various times.
Fig. 4. Temperature dependence of storage modulus of PVA88 film and
PVA88/montmorillonite film stirred at various times.
2009 89
PVA
PVA
PVAPVA
PVA
E′ PVA995.6PVA96
3.4 Fig. 8 MA PVA88
Fig. 5. Temperature dependence of loss modulus of PVA88 film and
PVA88/montmorillonite film stirred at various times.
Fig. 6. Temperature dependence of dynamic viscoelastic properties
of each PVA film.
Fig. 7. Temperature dependence of dynamic viscoelastic properties
of each PVA/montmorillonite film stirred time at 48h.
90 Vol. 55, No. 2
MA
PVA
E′
PVA99PVA96
PVA88MA
E′ MA
MA PVA
MA PVA
Fig. 8. Tensile shear strength and wood failure of PVA88/
montmorillonite stirred at various times.
Fig. 9. Tensile shear strength and wood failure of each PVA and
PVA/montmorillonite stirred time at 48h.
2009 91
E″ E′
MA
PVA
3 607, 3233252005.
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1721791988.
2004, pp. 123.
T., Yazawa, H. : Journal of Appl ied Polymer
Science 996, 32363240 2006.
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321, 36411992.
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2004, pp. 2537.
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