頁籤選單縮合
題名 | 液晶段式共聚醚酯--氨酯之合成及性質=Study of the Synthesis and Physical Properties of Liquid Crystalline Block Copolyetherester-Urethanes |
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作者 | 李大剛; | 書刊名 | 宜蘭農工學報 |
卷期 | 16 1998.06[民87.06] |
頁次 | 頁153-164 |
分類號 | 467.42 |
關鍵詞 | 段式共聚醚酯--氨酯; 熱塑性彈性體; 液晶性質; 結構物性; 熱性質; Block copolyetherester-urethanes; Liquid crystalline behavior; Thermoplastic elastomers; Thermal properties; Structure-property relationships; |
語文 | 中文(Chinese) |
中文摘要 | 本計畫係將過量之 1,5- 戊二醇與 4,4'- 聯苯二甲酸二甲酯( dimethyl 4,4'- bilbenzoate )依不同的入料比以聚縮合法生成四種不同分子量之聚( 4,4'- 聯苯二甲酸 戊二酯)二醇 [Poly (pentamethylene 4,4'-binzoate)] glycol, 同時利用�� HNMR 鑑定 其組成。再以此四種不同分子量之聚( 4,4'- 聯苯二甲酸戊二酯)二醇與 MDI (甲撐二苯 異氰酸酯)及分子量 2000 之聚醚二元醇 PTMEG 以溶液( DMF )聚合生成硬段含量分別為 15%,30% 及 45% 之熱向性段式共聚醚酯 -- 氨酯。 此系列段式共聚醚酯 -- 氨酯具有可形成液晶相的聚( 4,4'- 聯苯二甲酸戊二酯)之硬鏈 節及聚四甲撐醚的軟鏈節,而可作為熱塑性彈性體。 改變聚( 4,4'- 聯苯二甲酸戊二酯) 二醇之分子量及其硬段含量( 15%, 30% 及 45% )將對段式共聚醚酯 -- 氨酯之液晶性質 ,熱學性質及機械性質均有很大的影響。不同結構組成之段式共聚醚酯 -- 氨酯以偏光顯微 鏡及 X- 射線繞射分析其結晶性質, 以 DSC (示差掃描熱卡計)測其熱學性質及拉力機研 究其機械性質。並依此建立段式共聚聚醚酯 -- 氨酯的結構物性的關係。 由實驗結果發現本系列共聚醚酯 -- 氨酯成品具有良好之機械性質,且其受組成影響甚鉅。 由 DSC,偏光顯微鏡及 X- 附線繞射分析其結晶性質得知聚酯寡聚合體之聚合度及硬鏈節含 量對共聚醚酯 -- 氨酯成品之結晶性質有決定性之影響。 |
英文摘要 | Four poly (pentamethylene 4,4'-bibenzoate) glycols with different molar mass are formed by melt polycondensation of 1,5-pentanediol and dimethyl-4,4' -bienzoate with various feed ratio. Four poly(pentamethylene 4,4'-bibenzoate) glycols react with MDI and poly (tetramethylene ether) glycol (PTMEG, Mn=2,000) in DMF to form a series of thermotropic block copolyetherester-urethanes with hard segment content of 15%, 30% and 45%, respectively. The block copolyetherester-urethanes are comprised of poly (pentamethylene 4,4'-bibenzoate) glycol as the hard segment which displays thermotropic liquid crystalline behavior and poly (tetramethylene ether) as the soft segment which shows rubbery behavior. The can be used as the thermoplastic elastomers. Three different hard segment content (15%, 30% and 45%) copolyetherester-urethanes are prepared. The molar mass of the hard segment and the hard segment content have great influence on the liquid crystalline behavior, thermal properties and mechanical properties of these block copolyetherester-urethanes. The effects of hard segment molar mass and hard segment content on the liquid crystalline behavior, thermal transitions, and mechanical properties are characterized by wide-angle X-ray diffraction, DSC (differential scanning calorimetry), and universal tensile test machine, respectively. From tensile results, the series of copolyetherester-urethane shows good mechanical properties, which affects by the hard segment molar mass and hard segment content, significantly。 The crystalline behavior are investigated by DSC, wide-angle X-ray diffraction and polarized microscopy。 Only the copolyetherester-urethanes with higher molar mass of hard segment and higher hard segment content display monotropic liquid crystalline behavior。 |
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