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題名 | The Nature of Smectic-Isotropic Transition of Thermotropic Block Copolyetheresters=熱向性段式共聚醚酯的距列--等向轉變的本性 |
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作者 | 蔡宏斌; | 書刊名 | 宜蘭農工學報 |
卷期 | 11 1995.12[民84.12] |
頁次 | 頁81-91 |
分類號 | 467.42 |
關鍵詞 | 熱向性; 距列; 段式共聚醚酯; 熱轉變; Thermotropic; Smectic; Block copolyetheresters; DSC; Thermal transitions; |
語文 | 英文(English) |
中文摘要 | 具有聚(烷撐p,p’--聯苯二甲酸酯)硬鏈節及聚(四甲撐醚)軟鏈節的熱向性 段式共聚醚酯以示差掃瞄卡計(DSC)研究之。並依此來說明距列--等向轉變的本性。由等 向態冷卻至低於等向--距列轉變但高於距列--結晶轉變的溫度後再升溫而得的後續升溫曲線 可指出距列--等向轉變的本性。距列--等向轉變峰與結晶--距列轉變峰重疊,或者甚至被結 晶--距列轉變峰蓋住,因此,從這些段式共聚醚酯的二次DSC升溫曲線不易於明顯分辨出距 列--等向轉變與結晶--距列轉變。 |
英文摘要 | The block copolyetheresters with hard segments of poly (alkylene p,p'-bibenzoate) and soft segments of poly (tetramethylene ether) have been investigated by the differential scanning calorimetry (DSC) to describe the nature of smectic-isotropic transition. The successive DSC heating curve after cooling from the isotropic state to a temperature below the isotropic-smectic transition but well above the smectic-crystalline transition indicates the nature of the smectic-isotropic transition for certain block copolyetheresters. The smectic-isotropic transition peak overlaps with the crystalline-smectic transition peak, or is even covered by the crystalline-smectic transition peak, thus it is difficult to distinguish the crystalline-smectic transition and the smectic-isotropic transition by the second run DSC heating curve for the block copolyetheresters. |
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