Studies on the nature of the macromolecular condensed state of "nascent" ultra high molar mass polyethylene

	Studies on the nature of the macromolecular condensed state of "nascent" ultra high molar mass polyethylene
	Fan ZY ; Lan Q ; Bu HS ; Wu LH ; Sun L ; Qian RY ; Chen SX ; Men YF ; Jiang BZ
刊名	chinese journal of polymer science
	2001
卷号	19 期号:1 页码:25-31
关键词	MOLECULAR-WEIGHT POLYETHYLENE
ISSN号	0256-7679
通讯作者	qian ry
中文摘要	ultra high molar mass polyethylene (uhpe) powder as polymerized in a slurry process has been studied, in its nascent state, after recrystallization on rapid cooling from the melt and after hot compression molding to a film, by dsc, effect of annealing the recrystallized specimen at 120 similar to 130 degreesc, morphology by polarizing optical microscopy and small angle x-ray scattering. based on the experimental results obtained the macromolecular condensed state of the nascent uhpe powder is a rare case of a multi-chain condensed state of non-interpenetrating chains, involving interlaced extended chain crystalline layers and relaxed parallel chain amorphous layers. on melting, a nematic rubbery state of nanometer size domain resulted. the nematic-isotropic transition temperature was judged from literature data to be at least 220 degreesc, possibly higher than 300 degreesc, the exact temperature is however not sue because of chain degradation at such high temperatures. the recrystallization process from the melt is a crystallization from a nematic rubbery state. the drop of remelting peak temperature by 10 k of the specimen recrystallized from its melt as compared to the nascent state has its origin in the decrease both of the crystalline chain stem length and of the degree of crystallinity. the remelting peak temperature could be returned close to that of the nascent state by annealing at 120 similar to 130 degreesc.
收录类别	SCI收录期刊论文
语种	英语
WOS记录号	WOS:000166329700005
公开日期	2010-11-04
内容类型	期刊论文
源URL	[http://202.98.16.49/handle/322003/20991]
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	Fan ZY,Lan Q,Bu HS,et al. Studies on the nature of the macromolecular condensed state of "nascent" ultra high molar mass polyethylene[J]. chinese journal of polymer science,2001,19(1):25-31.
APA	Fan ZY.,Lan Q.,Bu HS.,Wu LH.,Sun L.,...&Jiang BZ.(2001).Studies on the nature of the macromolecular condensed state of "nascent" ultra high molar mass polyethylene.chinese journal of polymer science,19(1),25-31.
MLA	Fan ZY,et al."Studies on the nature of the macromolecular condensed state of "nascent" ultra high molar mass polyethylene".chinese journal of polymer science 19.1(2001):25-31.