Observation of inverted phases in poly(styrene-b-butadiene-b-styrene) triblock copolymer by solvent-induced order-disorder phase transition
文献类型：期刊论文
| 作者 | Zhang QL ; Tsui OKC ; Du BY ; Zhang FJ ; Tang T ; He TB |
| 刊名 | macromolecules
 |
| 出版日期 | 2000 |
| 卷号 | 33期号:26页码:9561-9567 |
| 关键词 | BLOCK POLYMER-SOLUTIONS DIBLOCK COPOLYMER SELECTIVE SOLVENTS MICRODOMAINS EQUILIBRIUM TEMPERATURE MORPHOLOGY MELTS MODEL |
| ISSN号 | 0024-9297 |
| 通讯作者 | tsui okc |
| 中文摘要 | we report observation of inverted phases consisting of spheres and/or cylinders of the majority fraction block in a poly(styrene-b-butadiene-b-styrene) (sbs) triblock copolymer by solvent-induced order-disorder phase transition (odt). the sbs sample has a molecular weight of 140k da and a polystyrene (ps) weight fraction of 30%. tapping mode atomic force microscopy (afm) and transmission electron microscopy (tem) were utilized to study the copolymer microstructure of a set of solution-cast sbs films dried with different solvent evaporation rates, r. the control with different r leads to kinetic frozen-in of microstructures corresponding to a different combination parameter chi (eff)z of the drying films (where chi (eff) is the effective interaction parameter of the polymer solution in the cast film and z the number of "blobs" of size equal to the correlation length one block copolymer chain contains), for which faster evaporation rates result in microstructures of smaller chi (eff)z. as r was decreased from rapid evaporations (similar to0.1 ml/h), the microstructure evolved from a totally disordered one sequentially to inverted phases consisting of spheres and then cylinders of polybutadiene (pb) in a ps matrix and finally reached the equilibrium phase, namely cylinders of ps in a pb matrix. we interpret the formation of inverted phases as due to the increased relative importance of entropy as chi (eff)z is decreased, which may dominate the energy penalty for having a bigger interfacial area between the immiscible blocks in the inverted phases. |
| 收录类别 | SCI收录期刊论文 |
| 语种 | 英语 |
| WOS记录号 | WOS:000166189900016 |
| 公开日期 | 2010-11-04 |
| 源URL | [http://202.98.16.49/handle/322003/19395]  |
| 专题 | 长春应用化学研究所_长春应用化学研究所知识产出_期刊论文 |
| 推荐引用方式 GB/T 7714 | Zhang QL,Tsui OKC,Du BY,et al. Observation of inverted phases in poly(styrene-b-butadiene-b-styrene) triblock copolymer by solvent-induced order-disorder phase transition[J]. macromolecules,2000,33(26):9561-9567. |
| APA | Zhang QL,Tsui OKC,Du BY,Zhang FJ,Tang T,&He TB.(2000).Observation of inverted phases in poly(styrene-b-butadiene-b-styrene) triblock copolymer by solvent-induced order-disorder phase transition.macromolecules,33(26),9561-9567. |
| MLA | Zhang QL,et al."Observation of inverted phases in poly(styrene-b-butadiene-b-styrene) triblock copolymer by solvent-induced order-disorder phase transition".macromolecules 33.26(2000):9561-9567. |
入库方式： OAI收割
来源：长春应用化学研究所
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