Citation: Hai-zhu Ma, Gao-xiang Ye. Dimensions of Atactic Poly(a-Methylstyrene) Chains with Side Groups[J]. Chinese Journal of Polymer Science, ;2006, 24(1): 87-93. shu

Dimensions of Atactic Poly(a-Methylstyrene) Chains with Side Groups

Hai-zhu Ma ,
Gao-xiang Ye

Received Date: 1 March 2005
Revised Date: 17 May 2005

An improved configurational-confomational statistical method is developed and the mean-square radius of gyration for atactic poly(-methylstyrene)(PMS) chains is studied, in which the effect of large side groups is considered. The deduced formulas, based on the rotational isomer state theory, are used to investigate the configuration-dependent properties of the atactic polymer chain, and the statistical correlation of the unperturbed polymer chain dimension and structure parameters are calculated. For the fraction of meso dyads wm = 0.4, the dependence of the radius of gyration Rg and the intrinsic viscosity [] on the molecule mass M are Rg = 2.63 102 M0.50 nm and [] = 7.36  102 M0.497, respectively, which are in agreement with the previous experimental data for the PMS samples. A small hump is detected in the curve of the characteristic ratio of the unperturbed mean-square radius of gyration versus the chain length for short PMS chains. The Rg increases linearly with the temperature T, and the effects of the chain length and the tacticity on the temperature coefficient are remarkable. These are quite different from the results for PMS chains not considering side groups or for the monosubstituted polystyrene chain.
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