CHAIN EXTENSION OF MALEIC ANHYDRIDE END-CAPPED POLY(1,2-CYCLOHEXYLENE CARBONATE) BY BISOXAZOLINES

	CHAIN EXTENSION OF MALEIC ANHYDRIDE END-CAPPED POLY(1,2-CYCLOHEXYLENE CARBONATE) BY BISOXAZOLINES
	Gao FX ; Zhou QH ; Qin YS ; Wang XH ; Zhao XJ ; Wang FS
刊名	acta polymerica sinica
	2011
期号	7 页码:772-777
关键词	EXTENDERS 2 POLYESTERS 2'-BIS(4H-3 DIOXIDE 1-BENZOXAZIN-4-ONE) COPOLYMERIZATION REACTIVITIES OXIDE CO2
ISSN号	1000-3304
通讯作者	gao fx
中文摘要	poly(1,2-cyclohexylene carbonate) (pchc) was prepared by copolymerization of carbon dioxide and cyclohexene oxide with y(ccl(3)oo)(3)-znet(2)-glycerin rare earth metal coordination ternary catalyst. the result polymer showed number average molecular weight (m(n)) of 56.3 x 10(3) with polydispersity index of 4.9. though pchc showed high glass transition temperature (t(g)), pchc was easy to degrade during melt processing, accompanied by severe deterioration of its mechanical performance, which constituted one of the main obstacles for commercialization of pchc. in order to impove the thermal stability and mechanical properties of pchc, the thermal decomposition reaction was compensated by the chemical chain extension reaction. at first, maleic anhydride was used as end-capper of pchc to prevent its chain unzipping reaction, the ma and pchc in weight ratio of 1:100 were added into dichloromethane to make a 20 wt% solution,and refluxed at 41 similar to 43 degrees c for 48 h, then the polymer was precipitated by ethanol to obtain maleic anhydride end-capped pchc (ma-pchc). ma-pchc was then subjected to chain extension reaction at 180 degrees c and 60 r/min in the a haake mixer for 5 min using 2,2'-bis (2-oxazoline) (boz) as chain extender. the optimal chain extension condition was found when equimolar boz and carboxyl group in ma-pchc were used, the m. of ma-pchc increased from 5. 6 x 10(4) to 12. 4 x 10(4). the thermal stability of pchc after chain extension was greatly improved,compared with the as-polymerized pchc, the thermal decomposition temperature at 5 wt% loss (t(d-5%)) for chain extended pchc increased from 260 c to 317 c, the tg increased from 114 degrees c to 133 degrees c, and most importantly, the melt viscosity increased by 30 times. it should be noted that no significant change in gelatin content was observed during chain extension reaction. moreover, the chain extended pchc showed tensile strength increase from 35. 8 mpa (as polymerized pchc) to 40. 2 mpa, and the elongation at break increased from 4. 59% to 6. 22%, yielding phenomenon was observed in the stress-strain curve. therefore, the chain extension strategy was effective to improve the mechanical performance of pchc.
收录类别	SCI收录期刊论文
语种	中文
WOS记录号	WOS:000293108000012
公开日期	2012-06-08
内容类型	期刊论文
源URL	[http://ir.ciac.jl.cn/handle/322003/44457]
专题	长春应用化学研究所_长春应用化学研究所知识产出_期刊论文
推荐引用方式 GB/T 7714	Gao FX,Zhou QH,Qin YS,et al. CHAIN EXTENSION OF MALEIC ANHYDRIDE END-CAPPED POLY(1,2-CYCLOHEXYLENE CARBONATE) BY BISOXAZOLINES[J]. acta polymerica sinica,2011(7):772-777.
APA	Gao FX,Zhou QH,Qin YS,Wang XH,Zhao XJ,&Wang FS.(2011).CHAIN EXTENSION OF MALEIC ANHYDRIDE END-CAPPED POLY(1,2-CYCLOHEXYLENE CARBONATE) BY BISOXAZOLINES.acta polymerica sinica(7),772-777.
MLA	Gao FX,et al."CHAIN EXTENSION OF MALEIC ANHYDRIDE END-CAPPED POLY(1,2-CYCLOHEXYLENE CARBONATE) BY BISOXAZOLINES".acta polymerica sinica .7(2011):772-777.