Solution crystallization behavior of linear and star-shaped poly(ethylene glycol)-b-poly(epsilon-caprolactone) block copolymers

doi:10.1007/s10118-013-1365-x

CORC > 兰州理工大学 > 兰州理工大学 > 石油化工学院

	Solution crystallization behavior of linear and star-shaped poly(ethylene glycol)-b-poly(epsilon-caprolactone) block copolymers
	Yu, Ting 2; Zhang, Jian-qiang 2,3; Li, Ya 1,2; Shen, Su-dan 2; Wei, Wen-feng 2; Chen, Peng 2; Wang, Zong-bao 2; Gu, Qun 2
刊名	CHINESE JOURNAL OF POLYMER SCIENCE
	2013-12
卷号	31 期号:12 页码:1717-1724
关键词	Lamellar crystal Topological structure PEG-b-PCL Edge dislocation Aspect ratio
ISSN号	0256-7679
DOI	10.1007/s10118-013-1365-x
英文摘要	Lamellar crystals of diblock, triblock and four-arm poly(ethylene glycol)-b-poly(E >-caprolactone) (PEG-b-PCL) crystalline-crystalline copolymers were successfully obtained from their solution. Morphology and structure of lamellar crystals of crystalline-crystalline copolymers were investigated using tapping-mode atomic force microscopy (AFM) and selected area electron diffraction (SAED). All of these samples showed the truncated-lozenge multilayer basal shapes with central screw dislocation or central stack, which were all obtained simultaneously from the oil bath. The diffraction pattern of PEG block lamellar crystal is attributed to the (120) diffracting planes and the pattern of PCL block lamellar crystal is attributed to the (110) diffracting planes and (200) diffracting planes according to the SAED results. Four (110) crystal growth planes and two (200) crystal growth planes are discovered for the PCL blocks, but the (120) crystal growth planes of PEG blocks are hided in the figure of AFM. The crystalline structure of the four-arm copolymers (FA) is more disorder and confused than that of the diblock (DI) copolymer and the striated fold surface structures of lamellar crystals of four-arm copolymers (FA) are smoother than these of linear analogues, owing to the confused crystallization of blocks caused by the mutual restriction of blocks and the hindrance of the dendritic cores. In addition, the aspect ratio of FA is greater than that of the others. It is hypothesized that there are two reasons for the change of aspect ratios. First, the (200) diffracting planes of PCL crystals grew slowly compared to their (110) diffracting planes because of difference in the energy barrier. Secondly, edge dislocations on the (200) diffracting planes are also responsible for the variation of the aspect ratio. Consequently, the crystalline defects are augmented by the competing blocks crystallized simultaneously and the hindrance of the dendritic cores.
资助项目	Zhejiang Provincial Natural Science Foundation[Y4100517]
WOS研究方向	Polymer Science
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000326884900011
状态	已发表
内容类型	期刊论文
源URL	[http://119.78.100.223/handle/2XXMBERH/34581]
专题	石油化工学院
通讯作者	Gu, Qun
作者单位	1.Ningbo Univ Technol, Inst Mat Engn, Ningbo 315016, Zhejiang, Peoples R China 2.Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Zhejiang, Peoples R China 3.Lanzhou Univ Technol, Sch Petrochem Technol, Lanzhou 730050, Peoples R China
推荐引用方式 GB/T 7714	Yu, Ting,Zhang, Jian-qiang,Li, Ya,et al. Solution crystallization behavior of linear and star-shaped poly(ethylene glycol)-b-poly(epsilon-caprolactone) block copolymers[J]. CHINESE JOURNAL OF POLYMER SCIENCE,2013,31(12):1717-1724.
APA	Yu, Ting.,Zhang, Jian-qiang.,Li, Ya.,Shen, Su-dan.,Wei, Wen-feng.,...&Gu, Qun.(2013).Solution crystallization behavior of linear and star-shaped poly(ethylene glycol)-b-poly(epsilon-caprolactone) block copolymers.CHINESE JOURNAL OF POLYMER SCIENCE,31(12),1717-1724.
MLA	Yu, Ting,et al."Solution crystallization behavior of linear and star-shaped poly(ethylene glycol)-b-poly(epsilon-caprolactone) block copolymers".CHINESE JOURNAL OF POLYMER SCIENCE 31.12(2013):1717-1724.