| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2013: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Outline of Final Research Achievements |
Recently, acetoacetylated PVA (AAPVA) that replaced part of the PVA side-chain with the reactive acetoacetyl group was introduced, and waterproof type polyvinyl acetate emulsion (PVAc) was synthesized by using AAPVA it as the protective colloid of emulsion adhesive on the basis of investigation of the characteristics of PVAc. Its physical properties and wood bonding performance were investigated as summarized following.
Hygroscopicity and water-solubility of EPVAc films were improved with AAPVA used as a protective colloid. Furthermore, it was proven that the plasticization of films by the moisture absorption and the lowering of the storage modulus by the heating were moderated for EPVAc films with AAPVA used as the protective colloid.
By blending PVA samples with various degrees of saponification and using them as adhesives, the adhesive performances of wood with poor bonding capacity can be greatly improved.
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