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.
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1 Received May 28, 2008 ; accepted July 11, 2008. 2 Faculty of Agriculture, Shizuoka Uni-
versity, Shizuoka 4228529, Japan
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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.
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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.
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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
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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.
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