不同性质聚乙烯醇为保护胶体对聚醋酸乙烯乳胶性质之影响.docVIP

聚乙烯醇性質對聚醋酸乙烯乳膠樹脂性能之影響 Effects of Properties of Polyvinyl Alcohol on the Performance of Polyvinyl Acetate Emulsion Resin 李文昭 Wen-Jau Lee (Corresponding Author) Cheng-Hsun Lin 台中市南區402國光路250號 國立中興大學森林學系 Email: wjlee@dragon.nchu.edu.tw 聚乙烯醇性質對聚醋酸乙烯乳膠樹脂性能之影響 李文昭1 林正勛2 [摘要] 本研究以兩種皂化度及兩種聚合度之聚乙烯醇(PVA)做為保護膠體合成聚醋酸乙烯(PVAc)樹脂乳液，探討不同種類PVA對所合成PVAc樹脂乳液性質之影響，試驗過程以乾燥樹脂薄膜之浸水試驗分析其耐水性，以FTIR分析其分子結構，以DSC分析其熱性質，並以木條膠合進行其膠合強度試驗。由試驗結果得知，完全皂化型PVA為保護膠體保護膠體─────────────────────────────────── 1 國立中興大學森林學系教授 (通訊作者) 台中市南區國光路250號 Professor (Corresponding Author), Department of Forestry, National Chung-Hsing University. 250, Kuo Kuang Rd. Taichung, Taiwan. e-mail: wjlee@dragon.nchu.edu.tw 2 國立中興大學森林學系碩士。 Master, Department of Forestry, National Chung-Hsing University. Effects of Properties of Polyvinyl Alcohol on the Performance of Polyvinyl Acetate Emulsion Resin Wen-Jau Lee1 Cheng-Hsun Lin2 【】polyvinyl acetate (PVAc) emulsion resins. The effects of various kinds of PVA on the performances of PVAc emulsion resin were investigated. Furthermore, the dried films of PVAc were soaked in water to estimate their water resistance. The FTIR was used to analyze the molecular structure. The DSC was used to analyze the thermal properties. The bonding strength was evaluated with wood specimens. The results showed that PVAc emulsion resins prepared with PVA of partially saponified or higher degree of polymerization as the protective colloid had the higher viscosity. The PVA used would retain in the dried films of PVAc. The films prepared from the PVAc that synthesized with the full saponified PVA as protective colloid had better water resistance. DSC analysis showed that the thermal melting and thermal degradation temperature of PVA would be influenced by the degree of saponification of PVA. But the thermal performance of PVAc was independent with the properties of PVA. As the various kinds of PVAc were used in wood gluing, the PVAc emulsion resins synthesized with higher molecula