| FOURIER TRANSFORM INFRARED STUDY OF FRACTIONATED AROMATIC POLYESTERS |
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| 作者姓名： | 刘小平 沈德言 施良和 徐懋 周其凤 段晓青 |
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| 作者单位： | Institute of Chemistry，Academia Sinica，Beijing，Institute of Chemistry，Academia Sinica，Beijing，Institute of Chemistry，Academia Sinica，Beijing，Institute of Chemistry，Academia Sinica，Beijing，Department of Chemistry，Peking University，Beijing，Department of Chemistry，Peking University，Beijing |
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| 摘 要： | Infrared spectra at different temperatures have been studied for fractions ofa liquid crystal tormmg aromatic polyester. The molecular interactions in different phases and their changes duringthe transitions were discussed. Abrupt frequency shift was found for bands of groups both in mesogens and flexible spacers during fusion and isotropization transitions. It may imply that both the mesogens and the flexible spacers are included in the same crystalline phase and give their contributions to the formation of the mesophase. The splitting into doublet of the C—O stretching vibrations was observed for both the aromatic and aliphatic esters and was attributed to the existence of local regions for ester groups different in ordering. The more ordered regions do not disappear completely even in the isotropic liquid phase.
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| 收稿时间： | 1988-09-10 |
FOURIER TRANSFORM INFRARED STUDY OF FRACTIONATED AROMATIC POLYESTERS |
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| LIU Xiaoping,SHEN Deyan,SHI Lianghe,XU Mao,ZHOU Qifeng,DUAN Xiaoqing.FOURIER TRANSFORM INFRARED STUDY OF FRACTIONATED AROMATIC POLYESTERS[J].Chinese Journal of Polymer Science,1989,0(3):280-287. |
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| Authors: | LIU Xiaoping SHEN Deyan SHI Lianghe XU Mao ZHOU Qifeng DUAN Xiaoqing |
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| Institution: | Institute of Chemistry; Academia Sinica; Beijing; Department of Chemistry; Peking University |
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| Abstract: | Infrared spectra at different temperatures have been studied for fractions ofa liquid crystal tormmg aromatic polyester. The molecular interactions in different phases and their changes duringthe transitions were discussed. Abrupt frequency shift was found for bands of groups both in mesogens and flexible spacers during fusion and isotropization transitions. It may imply that both the mesogens and the flexible spacers are included in the same crystalline phase and give their contributions to the formation of the mesophase.The splitting into doublet of the C—O stretching vibrations was observed for both the aromatic and aliphatic esters and was attributed to the existence of local regions for ester groups different in ordering.The more ordered regions do not disappear comletely even in the isotropic liquid phase. |
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| Keywords: | Aromatic polyester fractions FTIR Molecular interactions Transitions |
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