Linear and Four-Armed Poly(L-lactide)-block-poly(D-lactide) Copolymers and Their Stereocomplexation with Poly(lactide)s

	Linear and Four-Armed Poly(L-lactide)-block-poly(D-lactide) Copolymers and Their Stereocomplexation with Poly(lactide)s
	Shao, Jun ; Tang, Zhaohui ; Sun, Jingru
刊名	journal of polymer science part b-polymer physics
	2014
卷号	52 期号:23 页码:1560-1567
关键词	STAR-SHAPED POLYLACTIDE POLY(L-LACTIC ACID) POLY(D-LACTIC ACID) STANNOUS OCTOATE STEREOSELECTIVE POLYMERIZATION STEREOBLOCK POLYLACTIDES SUPERCRITICAL-FLUID BASE COMPLEX PLA RESEARCH RAC-LACTIDE
通讯作者	li,g
英文摘要	linear and four-armed poly(l-lactide)-block-poly(d-lactide) (plla-b-pdla) block copolymers are synthesized by ring-opening polymerization of d-lactide on the end hydroxyl of linear and four-armed plla prepolymers. dsc results indicate that the melting temperature and melting enthalpies of poly (lactide) stereocomplex in the copolymers are obviously lower than corresponding linear and four-armed plla/pdla blends. compared with the four-armed plla-b-pdla copolymer, the similar linear plla-b-pdla shows higher melting temperature (212.3 degrees c) and larger melting enthalpy (70.6 j g(-1)). after these copolymers blend with additional neat plas, dsc, and waxd results show that the stereocomplex formation between free pla molecular chain and enantiomeric pla block is the major stereocomplex formation. in the linear copolymer/linear pla blends, the stereocomplex crystallites (sc) as well as homochiral crystallites (hc) form in the copolymer/pla cast films. however, in the four-armed copolymer/linear pla blends, both sc and hc develop in the four-armed plla-b-pdla/pdla specimen, which means that the stereocomplexation mainly forms between free pdla molecule and the inside plla block, and the outside pdla block could form some microcrystallites. although the melting enthalpies of stereocomplexes in the blends are smaller than that of neat copolymers, only two-thirds of the molecular chains participate in the stereocomplex formation, and the crystallization efficiency strengthens. (c) 2014 wiley periodicals, inc. j. polym. sci., part b: polym. phys. 2014, 52, 1560-1567
收录类别	SCI
语种	英语
公开日期	2015-10-27
内容类型	期刊论文
源URL	[http://ir.ciac.jl.cn/handle/322003/57293]
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	Shao, Jun,Tang, Zhaohui,Sun, Jingru. Linear and Four-Armed Poly(L-lactide)-block-poly(D-lactide) Copolymers and Their Stereocomplexation with Poly(lactide)s[J]. journal of polymer science part b-polymer physics,2014,52(23):1560-1567.
APA	Shao, Jun,Tang, Zhaohui,&Sun, Jingru.(2014).Linear and Four-Armed Poly(L-lactide)-block-poly(D-lactide) Copolymers and Their Stereocomplexation with Poly(lactide)s.journal of polymer science part b-polymer physics,52(23),1560-1567.
MLA	Shao, Jun,et al."Linear and Four-Armed Poly(L-lactide)-block-poly(D-lactide) Copolymers and Their Stereocomplexation with Poly(lactide)s".journal of polymer science part b-polymer physics 52.23(2014):1560-1567.