環氧樹脂∕酚液化柳杉為基質製作發泡體之性質

Properties of Foams Made with Matrixes Blended with Epoxy Resin and Phenol-liquefied Cryptomeria japonica

本研究將柳杉木材以酚為溶劑進行液化處理，另以雙酚A（Bisphenol A）及環氧氯丙烷（Epichlorohydrin）為原料合成環氧樹脂（Epoxy resin），所得環氧樹脂與酚液化木材分別以重量比100／0、100／10、100／20、100／30混合，並添加三乙基四胺（Triethylene tetramine）為架橋硬化劑，六甲基二矽氧烷（Hexamethyldisiloxane）為發泡劑製作環氧樹脂發泡體。由試驗結果得知，此摻合樹脂可於常溫下發生放熱反應，並發泡、硬化而形成發泡體，其中以環氧樹脂為原料者，其發泡體密度在0.21g／cm^3以下，而隨液化木材添加量增加，發泡體密度提高；DSC熱分析顯示各摻合樹脂在形成發泡體過程已完全硬化，此發泡體在加熱過程出現相轉移現象，其中以環氧樹脂為原料者之玻璃轉移溫度（Tg）約120℃，添加液化木材者則向低溫側偏移，然發泡劑添加量較多者則具有較高之Tg溫度；TGA熱重分析顯示環氧樹脂發泡體之熱裂解主要發生在250～400℃之間，添加液化木材者在加熱至700℃時則有較高之焦炭率。 In this study, wood of Cryptomeria japonica was liquefied with phenol as a solvent and the epoxy resin was synthesized from epichlorohydrin and bisphenol A. The epoxy resin was mixed with phenol-liquefied wood by the weight ratio of 100/0, 100/10, 100/20 and 100/30, and the triethylene tetramine and hexamethyldisiloxane were added as the cross-linking hardener and foaming agent, respectively, to made epoxy foams. The results showed that these blended resins took an exothermic reaction under room temperature and formed epoxy foams by foaming and curing reaction. The foams made from pure epoxy resin as a raw material had the density lower than 0.21 g/cm^3, but it increased with the amount of liquefied wood added. DSC analysis showed that all of the foams had completely cured during the period of foaming process. The foams showed a phase-transferring phenomenon during the period of heating. The glass transition temperature (Tg) of epoxy resin foams appeared at about 120℃ but it shifted to lower temperature when blended with liquefied wood. However, increasing the foaming agent, the foams had a higher Tg temperature. TGA analysis showed that the main thermo-degradation of various epoxy foams occurred at 250-400℃. The foams made from epoxy resin that blended with liquefied wood had a higher char yield as heating to 700℃.

In this study, wood of Cryptomeria japonica was liquefied with phenol as a solvent and the epoxy resin was synthesized from epichlorohydrin and bisphenol A. The epoxy resin was mixed with phenol-liquefied wood by the weight ratio of 100/0, 100/10, 100/20 and 100/30, and the triethylene tetramine and hexamethyldisiloxane were added as the cross-linking hardener and foaming agent, respectively, to made epoxy foams. The results showed that these blended resins took an exothermic reaction under room temperature and formed epoxy foams by foaming and curing reaction. The foams made from pure epoxy resin as a raw material had the density lower than 0.21 g/cm^3, but it increased with the amount of liquefied wood added. DSC analysis showed that all of the foams had completely cured during the period of foaming process. The foams showed a phase-transferring phenomenon during the period of heating. The glass transition temperature (Tg) of epoxy resin foams appeared at about 120℃ but it shifted to lower temperature when blended with liquefied wood. However, increasing the foaming agent, the foams had a higher Tg temperature. TGA analysis showed that the main thermo-degradation of various epoxy foams occurred at 250-400℃. The foams made from epoxy resin that blended with liquefied wood had a higher char yield as heating to 700℃.