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 | 2000-12-26 |
| 卷号 | 33期号:26页码:9561-9567 |
| ISSN号 | 0024-9297 |
| 英文摘要 | 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. |
| 语种 | 英语 |
| WOS记录号 | WOS:000166189900016 |
| 出版者 | AMER CHEMICAL SOC |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/75945]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Tsui, OKC |
| 作者单位 | 1.Hong Kong Univ Sci & Technol, Dept Phys, Hong Kong, Hong Kong, Peoples R China 2.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China |
| 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：化学研究所
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