頁籤選單縮合
題 名 | 鏈延長劑添加比例對水性聚胺酯樹脂性質之影響=Effect of the Addition Rate of Chain Extender on the Properties of Waterborne Polyurethane Resin |
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作 者 | 陳彥君; 李文昭; | 書刊名 | 林產工業 |
卷 期 | 36:4 2017.12[民106.12] |
頁 次 | 頁225-241 |
分類號 | 467.41 |
關鍵詞 | 鏈延長劑; 柳杉; 乙二胺; 液化木材; 水性聚胺基甲酸酯樹脂; Chain extender; Cryptomeria japonica; Ethylenediamine; Liquefied wood; Waterborne polyurethane resin; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究將柳杉(Cryptomeria japonica Don;Japanese cedar)木材以聚乙二醇/丙三醇混合液為溶劑進行液化處理得液化木材(Liquefied wood;LW)。水性聚胺基甲酸酯樹脂(Polyurethane resin;PU)合成時以聚四甲基醚二醇(Polytetramethylene ether glycol;PTMG)及OH基莫耳比1/1之PTMG/LW為多元醇,二羥甲基丙酸(Dimethylolpropionic acid;DMPA)為內部乳化劑,在NCO/OH官能基莫耳比1.6/1.0條件與異弗爾酮二異氰酸酯(Isophorone diisocyanate;IPDI)反應形成含NCO末端基預聚合樹脂,隨後加入乙二胺(Ethylenediamine;EDA)為鏈延長劑,並在NH_2/NCO莫耳比1.1/1.0、1.2/1.0及1.3/1.0 條件下進行鏈延長反應得WPU(Waterborne PU)及LWPU(LW-contained waterborne PU)兩種系列水性PU樹脂。由實驗結果顯示,利用PTMG/LW為原料所合成LWPU懸浮液之平均粒徑大於WPU懸浮液,隨-NH_2/-NCO 莫耳比增加,水性PU樹脂之平均分子量而降低。FTIR及XRD分析顯示所合成水性PU樹脂同時具備胺酯及尿素結構,分子鏈排列則以不定形結構型態為主。兩種系列水性PU樹脂比較,WPU樹脂薄膜浸水膨潤係數較小,重量保留率較高,拉伸強度、破壞伸長率及破壞能量較大,熱活動性較明顯。隨-NH_2/-NCO莫耳比提高,膨潤係數增大,重量保留率降低,拉伸強度及破壞伸長率減小。DMA 分析顯示PU樹脂薄膜內部存在兩相結構,添加LW可提高PU樹脂中軟鏈段之剛性,提高-NH_2/-NCO莫耳比可降低結晶區的熱活動性。TGA分析顯示,分子鏈長度對PU樹脂熱安定性之影響效應大於分子結構。 |
英文摘要 | In this study, wood of Cryptomeria japonica was liquefied with the mixture of polyethylene glycol/glycerol as a solvent to obtain a liquefied wood (LW). Waterborne polyurethane resin (PU) was prepared using polytetramethylene ether glycol (PTMG) and a mixture of PTMG/LW (1/1 by OH group molar ratio) as polyol, dimethylolpropionic acid (DMPA) as an internal emulsifier, which were reacted with isophorone diisocyanate (IPDI) with the NCO/OH molar ratio of 1.6/1.0 to form NCO-terminated prepolymer resin. Ethylenediamine (EDA) was then added and chain extension reaction was carried out at NH_2/NCO molar ratios of 1.1/1.0, 1.2/1.0 and 1.3/1.0 to obtain two types of waterborne PU resin, named WPU and LWPU, respectively. The experimental result shows that the average particle size of LWPU suspensions synthesized with PTMG/LW as raw material is larger than that of WPU suspensions. Increasing the molar ratio of NH_2/NCO, the average molecular weight of waterborne PU resin decreased. FTIR and XRD analysis show that all synthesized waterborne PU resins have both urethane and urea structure, and the molecular chain arrangement is dominated by the type of amorphous structure. Compared with the two types of waterborne PU resin, WPU films have a smaller swelling coefficient and higher weight retention after water immersion, higher tensile strength and elongation at breaking, greater destruction energy, and more obvious thermal activity. With the NH_2/NCO molar ratio increased, the swelling coefficient increased, the weight retention rate decreased, and the tensile strength and fracture elongation decreased. DMA analysis shows that a two-phase structure exists within the PU resin film. The addition of LW can increase the rigidity of the soft segment in the PU resin. On the other hand, increasing the NH_2/NCO molar ratio can reduce the thermal activity of the crystalline region. TGA analysis indicates that the effect of molecular chain length on the thermal stability of PU resin is greater than that of molecular structure. |
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