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

doi:10.1007/s10118-013-1365-x

IR > 石油化工学院

	Solution crystallization behavior of linear and star-shaped poly(ethylene glycol)-b-poly(É"-caprolactone) block copolymers
	Yu, Ting 1; Zhang, Jian-qiang1,2 ; Li, Ya 1,3; Shen, Su-dan 1; Wei, Wen-feng 1; Chen, Peng 1; Wang, Zong-bao 1; Gu, Qun 1
	2013-12-01
发表期刊	Chinese Journal of Polymer Science (English Edition)
ISSN	02567679
卷号	31 期号:12 页码:1717-1724
摘要	Lamellar crystals of diblock, triblock and four-arm poly(ethylene glycol)-b-poly(É"-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. © 2013 Chinese Chemical Society, Institute of Chemistry, Chinese Academy of Sciences and Springer-Verlag Berlin Heidelberg.
关键词	Aliphatic compounds Aspect ratio Atomic force microscopy Block copolymers Crystal atomic structure Crystal growth Crystallization Edge dislocations Electron diffraction Ethylene glycol Morphology Polyethylene oxides Polyols Crystalline defects Crystalline structure Lamellar crystals Morphology and structures Selected area electron diffraction Solution crystallization Tapping-mode atomic force microscopy Topological structure
DOI	10.1007/s10118-013-1365-x
收录类别	EI ; SCIE
语种	英语
WOS研究方向	Polymer Science
WOS类目	Polymer Science
WOS记录号	WOS:000326884900011
出版者	Springer Verlag
EI入藏号	20212810631774
EI主题词	Polyethylene glycols
EI分类号	741.3 Optical Devices and Systems ; 802.3 Chemical Operations ; 804.1 Organic Compounds ; 815.1 Polymeric Materials ; 815.1.1 Organic Polymers ; 933.1.1 Crystal Lattice ; 933.1.2 Crystal Growth ; 951 Materials Science
引用统计	被引频次：6[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	https://ir.lut.edu.cn/handle/2XXMBERH/150431
专题	石油化工学院
通讯作者	Gu, Qun
作者单位	1.Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Zhejiang, Peoples R China; 2.Lanzhou Univ Technol, Sch Petrochem Technol, Lanzhou 730050, Peoples R China; 3.Ningbo Univ Technol, Inst Mat Engn, Ningbo 315016, Zhejiang, 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(É"-caprolactone) block copolymers[J]. Chinese Journal of Polymer Science (English Edition),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(É"-caprolactone) block copolymers.Chinese Journal of Polymer Science (English Edition),31(12),1717-1724.
MLA	Yu, Ting,et al."Solution crystallization behavior of linear and star-shaped poly(ethylene glycol)-b-poly(É"-caprolactone) block copolymers".Chinese Journal of Polymer Science (English Edition) 31.12(2013):1717-1724.