Four-armed PCL-b-PDLA diblock copolymer: 1. Synthesis, crystallization and degradation

doi:10.1016/j.polymdegradstab.2014.05.016

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	Four-armed PCL-b-PDLA diblock copolymer: 1. Synthesis, crystallization and degradation
	Ning, Zhenbo 1,3; Jiang, Ni 1; Gan, Zhihua 1,2
刊名	POLYMER DEGRADATION AND STABILITY
	2014-09-01
卷号	107 页码:120-128
关键词	Four-armed Diblock Copolymers Pcl Pdla Crystallization Enzymatic Degradation Alkaline Treatment
ISSN号	0141-3910
DOI	10.1016/j.polymdegradstab.2014.05.016
英文摘要	A series of four-armed poly(a-caprolactone)-b-poly(o-lactic acid) diblock copolymers (4a-PCL-b-PDLA) with well controlled composition were synthesized. The effect of length of PCL and PDLA blocks on the crystallization and enzymatic/alkaline degradation was studied. It was found that the PDLA blocks have great influence on the crystallization of PCL blocks under two different crystallization conditions. The copolymers with shorter PDLA blocks showed faster degradation rate but different spherulite structures after enzymatic degradation or alkaline degradation. The morphological changes of spherulites depended on the PCL chains which were trapped inside or excluded from the spherulites of PDLA when the copolymer crystallized at 80 degrees C or 30 degrees C (i.e. above or lower the glass transition temperature of PDLA chains). The spherulite morphology and porous morphology of copolymer films after degradation were well discussed. This work revealed that the crystalline morphology and degradation rate of PCL-b-PDLA films could be well controlled by copolymer composition and confined crystallization of PCL chains within the previously formed lamellar stacks of PDLA. (C) 2014 Elsevier Ltd. All rights reserved.
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000342269600014
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/51965]
专题	中国科学院化学研究所
通讯作者	Jiang, Ni
作者单位	1.Chinese Acad Sci, CAS Key Lab Engn Plast, Inst Chem, Beijing 100190, Peoples R China 2.Beijing Univ Chem Technol, State Key Lab Organ Inorgan Composites, Beijing 100029, Peoples R China 3.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Ning, Zhenbo,Jiang, Ni,Gan, Zhihua. Four-armed PCL-b-PDLA diblock copolymer: 1. Synthesis, crystallization and degradation[J]. POLYMER DEGRADATION AND STABILITY,2014,107:120-128.
APA	Ning, Zhenbo,Jiang, Ni,&Gan, Zhihua.(2014).Four-armed PCL-b-PDLA diblock copolymer: 1. Synthesis, crystallization and degradation.POLYMER DEGRADATION AND STABILITY,107,120-128.
MLA	Ning, Zhenbo,et al."Four-armed PCL-b-PDLA diblock copolymer: 1. Synthesis, crystallization and degradation".POLYMER DEGRADATION AND STABILITY 107(2014):120-128.