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題名 | Poly(Ethylene/Butylene Terephthalate)共聚酯玻璃轉位溫度與非等溫結晶行為之探討=The Glass Transition Temperature and Non-isothermal Crystallization Behaviors of Poly(Ethylene/Butylene Terephthalate) Coployesters |
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作者 | 石天威; 羅志明; | 書刊名 | 紡織綜合研究期刊 |
卷期 | 17:3 2007.07[民96.07] |
頁次 | 頁17-23 |
分類號 | 478.11 |
關鍵詞 | poly(ethylene/butylene terephthalate)共聚酯; 玻璃轉位溫度; 結晶動力學; Poly(ethylene/butylene terephthalate) copolyester; Glass transition temperature; Crystallization kinetic; |
語文 | 中文(Chinese) |
中文摘要 | 共聚單元結構之特性和其序列排列對於共聚合體之熱性質有著顯著的影響。本研究主要探討以乙二醇 (Ethylene Glycol‧EG)、1,4-丁二醇 (1,4-butanediol,BDO)、對苯二甲酯 (Dimethyl Terephthalate,DMT) 共聚成 Poly (ethylene/butylene terephthalate,BDO) 共聚酯的玻璃轉位溫度及其結晶行為。EB共聚酯玻璃轉位溫度可以 Fox 和Johnston方程式計算共聚酯的玻璃轉位溫度,實驗發現Johnston方程式考量共聚體分子鏈上的交替序列排列,其計算結果與實驗數據有較高的一致性。微差掃描熱分析儀和可加熱式偏光顯微鏡的研究結果顯示,共聚單體以不同組成比例所聚合之EB共緊酯皆具結晶性。最低熔點出現在 EG 和BDO組成含量約略相同之EB70共聚酯 (183℃)。值得注意的是,結晶動力學的分析顯示,在少比例的EG單體加入EB共聚酯時,共聚酯的結晶速率常數有增加的情形。 |
英文摘要 | The effects of comonomer characteristics and sequence distribution of macromolecule on the thermal property of copolymer are significant. In this work the glass transition temperature, crystallization kinetic, and crystal morphology of poly(ethylene/butylene terephthalate, EB) copolyesters, synthesized from ethylene glycol, 1,4-butanediol, and dimethyl terephthalate with different molar volume ratios, were studied The glass transition temperatures of EB copolyesters were analyzed using a differential scanning calorimetre. The experimental data were compared with the calculated values, based on the Fox's and Johnston's equations. Due to considering the altemating sequence distribution of macromolecule, the calculated values of the glass transition temperatures of EB copolyesters, based on Johnston's equation, are more consistent with the experimental data. Crystallites were observed across the full range of ethylene glycol/1,4-butanediolcomposition using a hot stage polarizing microscope. The minimal melting temperature was obtained in EB70 (183℃),which the calculated relative amounts of EG/BDO was 52.70/47.30. According to the analysis of crystallization kinetic, it is worthy to note that the crystallization rate constant increases when a few EG monomer added in molecular chain. |
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