The study on the properties of aggregates of PLA-b-PEO-b-PLA triblock copolymers in aqueous media

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	The study on the properties of aggregates of PLA-b-PEO-b-PLA triblock copolymers in aqueous media
	Yuan, JJ ; Li, YS ; Zhu, HG ; Cheng, SY ; Jiang, L ; Feng, LX ; Fan, ZQ
刊名	ACTA POLYMERICA SINICA
	2004-02-01
期号	1 页码:1-7
关键词	Bolck Copolymer Self-assembly Surface Viscoelasticity Aggregates
ISSN号	1000-3304
英文摘要	PLA-b-PEO-b-PLA triblock copolymers with different compositions were prepared by ring-open polymerization using OH-capped PEO as macroinitiators. The "crew-cut" aggregates of PLA-b-PEO-b-PLA triblock copolymers in aqueous media were fabricated by dropping water into block copolymer solutions in common solvents. The surface morphology and micro-viscoelasticity of aggregates cast on mica sheets from colloids were investigated by scanning probe microscopy (SPM). It was observed that the micelles with a diameter of about 45 nm were formed and organized into relatively single layer on mica surface. Interstedly, inhomogeneity of surface modulus appeared as the water of colloids evaporated. The top of aggregates had relatively higher modulus than that of the peripheral parts of aggregates. The changes of environments of aggregates from polar water to unpolar air on mica sheets were suggested to be responsible for the surface modulus inhomogeneity. In addition, the experimental data showed that the sizes of aggregates measured from dynamic light scattering were. greatly larger than those from SPM observations. At the same time, increasing the initial concentration of copolymers in common solvents resulted in the increase of aggregate sizes and higher polydispersities.
语种	英语
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000188968000001
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/82451]
专题	中国科学院化学研究所
通讯作者	Yuan, JJ
作者单位	1.Hubei Univ, Coll Chem & Mat Sci, Wuhan 430062, Peoples R China 2.Chinese Acad Sci, Inst Chem, Beijing 100080, Peoples R China 3.Zhejiang Univ, Inst Polymer Sci, Hangzhou 310027, Peoples R China
推荐引用方式 GB/T 7714	Yuan, JJ,Li, YS,Zhu, HG,et al. The study on the properties of aggregates of PLA-b-PEO-b-PLA triblock copolymers in aqueous media[J]. ACTA POLYMERICA SINICA,2004(1):1-7.
APA	Yuan, JJ.,Li, YS.,Zhu, HG.,Cheng, SY.,Jiang, L.,...&Fan, ZQ.(2004).The study on the properties of aggregates of PLA-b-PEO-b-PLA triblock copolymers in aqueous media.ACTA POLYMERICA SINICA(1),1-7.
MLA	Yuan, JJ,et al."The study on the properties of aggregates of PLA-b-PEO-b-PLA triblock copolymers in aqueous media".ACTA POLYMERICA SINICA .1(2004):1-7.