The Glass Transition of Copolyester

Abstract

Abstract: The glass transition of poly(ethylene tetrephthalate/isophthalate) and poly-(ethylene/teramethylene tetrephthalate) copolyesters were studied by using DSC,DLI (depolarized light intensity) and IR analysis. It was shown that the glass transition of copolyesters was a change after the disorientation of the order in their glassy state. The forms of glass transition in DSC thermograms of the two serial copolyesters transformed from step change to endothermic peak with the increase of ET segments in the molecular chains. This is caused by the decrease in the number of ET segments which need to maintain their conformation change. The order of glassy P(ET/EI) copolyester relates to the free hydroxy at the end of the chains. The formation of hydrogen bond between free hydroxy and carbonyl is a necessary process when PET and crystallizable copolyester crystallizing, and the glass transition of uncrystallizable copolyester(IPA 30) will disappear after the formation of these hydrogen bonds.

Key words: Polyethylene terephthalate(PET), Copolyester, Glass transition, IR spectrum

CLC Number:

O631

TrendMD:

BIAN Jie, YE Sheng-Rong, FENG Lin-Xian . The Glass Transition of Copolyester[J]. Chem. J. Chinese Universities, 2003, 24(1): 155.

[1]	JIAO Long, DAI Xuemin, MU Jianxin, DU Zhijun, WANG Hanfu, DONG Zhixin, QIU Xuepeng. Preparation and Properties of High Heat-resistant Polyimide Films for Flexible OLED [J]. Chem. J. Chinese Universities, 2022, 43(11): 20220390.
[2]	ZHAO Baodong, LIU Yajing, PAN Yongfei, LIU Weixiao, GAO Fulei, WANG Yinglei. Synthesis and Properties of Energetic Plasticizer 2，2-Dinitropropyl Trifluoropropanoate [J]. Chem. J. Chinese Universities, 2021, 42(9): 2815.
[3]	HUANG Congcong, ZHANG Baoqing, LIU Chenyang. Predicting the Glass Transition Temperature of Polyimides： Group Additive Property Method and Assigning the Group Contributions to Unknown Groups [J]. Chem. J. Chinese Universities, 2021, 42(8): 2617.
[4]	CAI Yanchao,NIU Pengfei,SHEN Zhenlu,LI Meichao. Electrocatalytic Oxidative Coupling of Primary Amines with the Medium ABNO ^† [J]. Chem. J. Chinese Universities, 2019, 40(11): 2308.
[5]	WU Hongmei,LI Huiting,LI Yongcheng,WANG Hongqing,WANG Meng. Using Group Contribution Method and Molecular Dynamics to Predict the Glass Transition Temperature of Poly(p-phenylene isophthalamide)^† [J]. Chem. J. Chinese Universities, 2019, 40(1): 180.
[6]	LI Juan, DU Fanfan, FENG Rui, HU Qian, JIE Suyun, LI Bogeng. Synthesis of Cyclic and Linear Block Copolyesters via Ring-opening Copolymerization of ε-Caprolatone and L-Lactide Catalyzed by Zinc Complex^† [J]. Chem. J. Chinese Universities, 2018, 39(6): 1297.
[7]	LU Ying, YANG Xue, YANG Xia, ZHU Suiyi, FAN Wei, GENG Zhi. Synthesis and Properties of a Novel Poly(aryl ether ketone)s Containing Halogen Groups [J]. Chem. J. Chinese Universities, 2015, 36(9): 1819.
[8]	YU Xiaohui, ZHANG Wenpeng, CAO Jianhua, JIANG Shidong, WU Dayong. Thermal Imidization Process of Electrospun Poly(amic acid) Film Studied by In-situ FTIR^† [J]. Chem. J. Chinese Universities, 2014, 35(10): 2246.
[9]	MA Chun-An, WANG Fen, LU Jin-Jin, LI Mei-Chao, ZHENG Wan-Fang. Studies on Electrochemical Oxidation Reaction of 2,4-Dichlorophenol on Pt Electrode [J]. Chem. J. Chinese Universities, 2013, 34(12): 2850.
[10]	WANG Yan-Wei, HE Ya-Ning, WANG Xiao-Gong. Photoinduced Orientation of Two Dendritic Azo Amorphous Molecular Materials [J]. Chem. J. Chinese Universities, 2012, 33(10): 2351.
[11]	ZHANG Shu-Li, XIONG Xian-Feng, YU Tao, WANG You-Bing, WANG Bo-Zhou, GE Zhong-Xue, ZHAI Gao-Hong, LI Hua. Synthetic Reaction Mechanism of Octogen by Chemometrics and Infrared Spectroscopy [J]. Chem. J. Chinese Universities, 2012, 33(07): 1444.
[12]	QIHE Ri-Ma, ZHAO Xiao-Guang, ZHANG Yun-Hong, YUAN Hui, XU Guang-Tong. Investigation of Selectivity over HDS Catalysts by in situ IR Spectra of Adsorbed CO and Molecular Simulation Calculation [J]. Chem. J. Chinese Universities, 2012, 33(02): 383.
[13]	YU Lei, HUA Xiao-Hui, ZHAI Yan-Jun, YANG Li-Min, ZHAO Guo-Zhong, MENG Tian-Hua, WENG Shi-Fu, XU Yi-Zhuang, LIU Ke-Xin, WU Jin-Guang, CHEN Jia-Er. Preparation and Characterization of Two GdCl3-galactitol Complexes [J]. Chem. J. Chinese Universities, 2011, 32(6): 1244.
[14]	GAO Jun-Shan, SHI Tie-Zheng, ZHAO Qing-Huan, DU Xi-Guang, ZHANG Hai-Qian . Synthesis, Characterization and Electrochemical Properties of a New Asymmetrical Nickel Phthalocyanine [J]. Chem. J. Chinese Universities, 2010, 31(8): 1585.
[15]	DAI Fu-Cai, CHANG Fei, REN Tong-Xiang, SUN Bao-Yun. Synthesis and Characterization of Metallofullerene Derivatives La@C82-(C4N2H8)mHn [J]. Chem. J. Chinese Universities, 2010, 31(10): 1976.

The Glass Transition of Copolyester

PDF (PC)

Knowledge

Abstract

Cite this article

share this article

References

Related Articles 15

Recommended Articles

Metrics

Comments