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	Synthesis and properties of carbon dioxide-ethylene oxide-cyclohexene oxide terpolymers
	Min Jiadong1,2; Zhang Yaming1; Chen Yuyan1; Wang Xianhong1; Zhao Xiaojiang1; Wang Fosong1
刊名	Acta polymerica sinica
	2008-11-20
期号	11页码:1076-1081
关键词	Carbon dioxide Ethylene oxide Cyclohexene oxide Terpolymerization
ISSN号	1000-3304
通讯作者	Min jiadong()
英文摘要	Poly(cyclohexene carbonate) (pchc) is one of the few biodegradable polymers maintaining dimension stability over 100 degrees c due to its high t-g of 115 degrees c, but pchc is quite difficult for melt processing because of its brittleness. in this work, backbone modification route was proposed by intercalating soft ethylene carbonate segments among the hard cyclohexene carbonate segments, where the terpolymerization of carbon dioxide (co2), ethylene oxide (eo) and cyclohexene oxide (cho) was carried out under ternary rare earth metal coordination catalyst prepared from y (ccl3 coo)(3,) glycerin, znet2. the terpolymerization was carried out at 70 degrees c in a 2000ml autoclave for 10 h. the obtained terpolymers were subjected to (1) h-nmr, (13) c-nmr experiments for structure analysis, gel permeation chromatography (gpc) was used to determine the number average molecular weight and its polydispersity, and dynamic mechanical analysis (dma) was used for thermo-mechanical studies, the mechanical performance was done with a zwick/z010 multi-function mechanical testing instrument. the catalytic activity was between 425 g/ (mol zn h) and 691 g/ (mol zn h), depending on the molar ratio of cho to eo, and the number average molecular weight ranged between 7.2 x 10(4) and 7.9 x 10(4), with polydispersity index changing from 3.17 to 3.57. the optimal catalytic activity reached 694 g/ (mol zn h) when equal molar ratio of eo and cho was added, and the obtained terpolymer showed a number average molecular weight of 7.9 x 10(4) with polydispersity index of below 3.5. the obsorption peaks in (1) h-nmr spectra of poly(ethylene carbonate), poly(cyclohexane carbonate) and related terpolymer were assigned. for the terpolymer obtained from equal ration of eo to cho, heteronuclear multiple-bond correlation (hmbc) experiments showed that alternating linkages between ethylene carbonate and cyclohexene carbonate were only 26.9% in the terpolymer, and random structure consisting of ethylene carbonate (ec) units and cyclohexane carbonate (chc) units was predominant. for the terpolymer obtained from equal molar ratio of eo to cho, the dynamic mechanical analysis (dma) spectra showed three peaks, one peak at -80 degrees c was attributed to a second transition in the terpolymer, the another two peaks appeared at 20 degrees c and 80 similar to 100 degrees c were assigned to the glass transitions of the polymer related to ethylene carbonate segments and cyclohexene carbonate segments, respectively, the existence of two glass transitions at different temperatures indicated that the existence of soft and hard segments in the backbone. introducing eo as the third comonomer was effective to solve the brittlenes of pchc making it melt processable, moreover, the thermal and mechanical properties of the terpolymer can be adjusted by changing the molar ratio of eo and cho in comonomers. for the terpolymer obtained from equal molar ratio of eo to cho, the young's modulus at 25 degrees c was 995.7 mpa, and its tensile strength was 27.1mpa with elongation at break of 42.3%. when the temperature was raised to 50 degrees c, the young's modulus maintained 868.7 mpa, and its tensile strength was 15.2 mpa with elongation at break of 57.6%. as a reference, poly (propylene carbonate) lost mechanical strength at 50 degrees c, the young's modulus at 40 degrees c was found to be 56.8 mpa, and its tensile strength was 2.1 mpa with elongation at break of 1814.9%. therefore, by means of terpolymerization of co2, eo an cho, a melt processable biodegradable polymer with improved dimension stability at higher temperatures was prepared.
WOS关键词	COORDINATION CATALYST ; POLYMER SYNTHESIS ; COPOLYMERIZATION ; CO2 ; EPOXIDES
WOS研究方向	Polymer Science
WOS类目	Polymer Science
语种	英语
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000260878600009
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2385179
专题	中国科学院大学
通讯作者	Min Jiadong
作者单位	1.Chinese Acad Sci, Changchun Inst Appl Chem, Polymer Mat & Engn Lab, Changchun 130022, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
推荐引用方式 GB/T 7714	Min Jiadong,Zhang Yaming,Chen Yuyan,et al. Synthesis and properties of carbon dioxide-ethylene oxide-cyclohexene oxide terpolymers[J]. Acta polymerica sinica,2008(11):1076-1081.
APA	Min Jiadong,Zhang Yaming,Chen Yuyan,Wang Xianhong,Zhao Xiaojiang,&Wang Fosong.(2008).Synthesis and properties of carbon dioxide-ethylene oxide-cyclohexene oxide terpolymers.Acta polymerica sinica(11),1076-1081.
MLA	Min Jiadong,et al."Synthesis and properties of carbon dioxide-ethylene oxide-cyclohexene oxide terpolymers".Acta polymerica sinica .11(2008):1076-1081.

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