Effects of surface wetting induced segregation on crystallization behaviors of melt-miscible poly(L-lactide)-block-poly(ethylene glycol) copolymer thin film

doi:10.1016/j.polymer.2013.05.032

CORC > 化学研究所 > 中国科学院化学研究所

	Effects of surface wetting induced segregation on crystallization behaviors of melt-miscible poly(L-lactide)-block-poly(ethylene glycol) copolymer thin film
	Yang, Jingjing 1,2,3; Liang, Yongri 1,2; Shi, Weichao 1,2,3; Lee, Han Sup 4; Han, Charles C.1,2
刊名	POLYMER
	2013-07-08
卷号	54 期号:15 页码:3974-3981
关键词	Surface Wetting Crystallization Poly(L-lactide)-block-Poly(Ethylene Glycol) (Plla-b-peg) Thin Film
ISSN号	0032-3861
DOI	10.1016/j.polymer.2013.05.032
英文摘要	The effects of wetting induced surface segregation on the crystal nucleation, growth rate, morphology and crystal orientation of melt-miscible crystalline crystalline diblock copolymer of poly(L-lactide)block-poly(ethylene glycol) (PLLA-b-PEG) thin films (similar to 90 nm) were investigated in this work with reflection optical microscopy (ROM), atomic force microscopy (AFM), and two-dimensional grazing incident wide angle X-ray scattering (2D GIWAXS) methods. The XPS results demonstrated that the wetting induced surface enrichment of PLLA block on the free surface of PLLA-b-PEG thin films occurred when the thin films annealed at 160 degrees C (molten state). When the PLLA-b-PEG thin film annealed at 160 degrees C for 30 min, the fraction of PLLA block (f(PLLA)) on the free surface could reach to similar to 90%. The ROM, AFM and 20 GIWAXS results indicated that the nucleation, crystal growth, morphology and crystal orientation of PLLA block in PLLA-b-PEG thin films were significantly influenced by prior wetting process. For the PLLA-b-PEG thin film with wetting time shorter than 15 min (similar to 52% < f(PLLA) < similar to 75%), the O-shaped flat-on nucleus preferentially formed on the free surface of thin films. However, for the thin film with wetting time longer than 15 min (f(PLLA) >similar to 75%), the S-shaped edge-on nucleus preferentially formed on the free surface at early stage of crystallization and then grew into tilted flat-on lamella. Furthermore, the overall spherulite growth rate of PLLA in PLLA-b-PEG thin films decreased with increase of wetting time. We found that the crystallization behavior of PLLA on the free surface in the PLLA-b-PEG thin films was strongly influenced by surface wetting induced changes of surface energy, composition and chain alignments. Our results demonstrated that the crystallization kinetics, morphology and crystal orientation of crystalline block copolymer thin films can be controlled by prior wetting process. (c) 2013 Elsevier Ltd. All rights reserved.
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000321538000024
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/53685]
专题	中国科学院化学研究所
通讯作者	Liang, Yongri
作者单位	1.Chinese Acad Sci, State Key Lab Polymer Phys & Chem, Joint Lab Polymer Sci & Mat, Beijing Natl Lab Mol Sci, Beijing 100080, Peoples R China 2.Chinese Acad Sci, Inst Chem, Beijing 100080, Peoples R China 3.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China 4.Inha Univ, Dept NanoSyst Engn, Inchon 402751, South Korea
推荐引用方式 GB/T 7714	Yang, Jingjing,Liang, Yongri,Shi, Weichao,et al. Effects of surface wetting induced segregation on crystallization behaviors of melt-miscible poly(L-lactide)-block-poly(ethylene glycol) copolymer thin film[J]. POLYMER,2013,54(15):3974-3981.
APA	Yang, Jingjing,Liang, Yongri,Shi, Weichao,Lee, Han Sup,&Han, Charles C..(2013).Effects of surface wetting induced segregation on crystallization behaviors of melt-miscible poly(L-lactide)-block-poly(ethylene glycol) copolymer thin film.POLYMER,54(15),3974-3981.
MLA	Yang, Jingjing,et al."Effects of surface wetting induced segregation on crystallization behaviors of melt-miscible poly(L-lactide)-block-poly(ethylene glycol) copolymer thin film".POLYMER 54.15(2013):3974-3981.