Coil to globule transition behaviour of poly(methyl methacrylate) in isoamyl acetate

被引：15

作者：

Kayaman, N

Gürel, EE

Baysal, BM ^{[1
]}

Karasz, FE

机构：

[1] TUBITAK Marmara Res Ctr, Dept Chem, TR-41470 Gebze, Turkey

[2] Bogazici Univ, Dept Chem Engn, TR-80815 Bebek, Turkey

[3] Univ Massachusetts, Dept Polymer Sci & Engn, Amherst, MA 01003 USA

来源：

POLYMER | 2000年 / 41卷 / 04期

基金：

美国国家科学基金会;

关键词：

dynamic light scattering; coil-globule collapse; poly(methyl methacrylate);

D O I：

10.1016/S0032-3861(99)00316-X

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The coil-globule transition behaviour of poly(methyl methacrylate) has been studied in isoamyl acetate by using the dynamic light scattering technique. The dimensions of the polymer show smooth and continuous contraction below a temperature (61.0 degrees C). The hydrodynamic size of PMMA in isoamyl acetate (M-w = 3.3 x 10(6) g mol(-1)) decreases to 41% in an unperturbed state at 18.4 degrees C. The temperature dependence of a chain contraction can be represented by a master curve in alpha(h)(3) \ tau \ M-w(1/2) vs \ tau \ M-w(1/2) plot, where alpha(h) = R-h/R-h,R-theta and tau = (T - theta)/theta. A high-chain density value implies that the highly collapsed globule contains 56% isoamyl acetate in its hydrodynamic volume. (C) 1999 Elsevier Science Ltd. All rights reserved.

引用

页码：1461 / 1468

页数：8

共 37 条

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