| 变温红外法研究聚对苯二甲酸乙二酯分子链的松弛运动及其构象转变 |
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| 引用本文： | 曾春莲,胡成龙,曾尊祥,杨薇.变温红外法研究聚对苯二甲酸乙二酯分子链的松弛运动及其构象转变[J].分析测试技术与仪器,2013,19(1):54-59. |
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| 作者姓名： | 曾春莲 胡成龙 曾尊祥 杨薇 |
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| 作者单位： | 1.中山大学 化学与化学工程学院，教育部聚合物复合材料及功能材料重点实验室, 广东 广州 510275 |
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| 摘 要： | 在30～170 ℃范围内逐渐升温过程中，用红外光谱仪原位检测无定形聚对苯二甲酸乙二酯（PET）薄膜红外光谱图的变化情况。通过特征谱带吸光度与温度的变化特点，研究了PET分子链在热变化过程中的松弛运动及冷结晶过程中分子链的构象变化。实验结果表明在冷结晶过程中，随PET结晶的不断完善，对应左右式(gauche)构象的吸收峰减弱，对应反式(trans)构象的吸收峰增强，并计算出CH2面外摇摆振动结晶前和结晶后反式构象和左右式构象的相对百分含量随温度的变化关系，以及玻璃化转变和冷结晶的温区范围。
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| 关 键 词： | 聚对苯二甲酸乙二酯 松弛运动 构象 |
| 收稿时间： | 2012/11/9 0:00:00 |
| 修稿时间： | 1/5/2013 12:00:00 AM |
Dynamic Relaxation and Conformation of PET Molecular Chain from the Amorphous State Observed by FTIR |
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| ZENG Chun-lian,HU Cheng-long,ZENG Zun-xiang and YANG Wei.Dynamic Relaxation and Conformation of PET Molecular Chain from the Amorphous State Observed by FTIR[J].Analysis and Testing Technology and Instruments,2013,19(1):54-59. |
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| Authors: | ZENG Chun-lian HU Cheng-long ZENG Zun-xiang and YANG Wei |
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| Affiliation: | 1.Key Laboratory for Polymeric Composites and Functional Materials of the Ministry of Education, School of Chemistry and Chemical Engineering , Sun Yat-Sen University, Guangzhou 5102752.Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education, School of Chemistry and Environmental Engineering, Jianghan University, Wuhan 4300563.School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275 |
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| Abstract: | By using the FTIR technique, the glass transition temperatures and chain conformation of poly(ethylene terephthalate) (PET) thin films were determined by detecting the abrupt changes in the absorbances of characteristic absorption bands during heating (30～170℃). It was found that the absorbance intensity of gauche conformation reduced with respect to that of trans conformation along with the crystallization. Moreover, the contents of gauche and trans conformations connected with CH2 wagging vibrations were calculated at different temperatures before and after cold crystallization. |
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| Keywords: | PET Dynamic Relaxation Conformation |
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