Development andthe elucidation of the mechanism of the adhesives for woods with poor bonding capability using phase-separated blends of polyvinyl alcohol.

为开发新型胶粘剂，使胶合性能较差的木材胶合在一起，制备了5种皂化程度不同的聚乙烯醇(PVA)胶粘剂。考察了水溶液的储存稳定性、油性组分的分散性以及木材的粘合性能。主要结论如下：1.用这些胶粘剂对涂抹了香附精油的木材试件的粘接性能进行了测试。在胶粘剂中不添加PMDI时，共混体系的粘接性能与非共混体系的粘接性能无明显差异。在胶粘剂中加入PMDI后，共混体系的粘接性能优于未共混体系。通过将不同皂化程度的PVA样品混合在一起作为胶粘剂，可以极大地改善粘接能力较差的木材的粘接性能

To develop novel adhesives that can bond wood species with poor bonding capacity to each other, five kinds of polyvinyl alcohol (PVA) samples with different degrees of saponification were prepared. The storage stability of the aqueous solutions, dispersibility of the oily components, and adhesion performance of the wood were examined. The following conclusions were drawn.The adhesion performance of wood specimens coated with essential oils of Chamaecyparis was examined using these adhesives. There was no significant difference between the adhesion performance of the blended system and that of the non-blended system when pMDI was not added to the adhesive. When pMDI was added to the adhesive, the adhesion performance of the blended system was better than that of the non-blended system. 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