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Journal of Zhejiang University SCIENCE A 2007 Vol.8 No.7 P.991-998


Unperturbed dimensions of atactic poly(dibenzyl itaconate)s

Author(s):  MA Hai-zhu, YE Gao-xiang

Affiliation(s):  Department of Physics, Zhejiang University, Hangzhou 310027, China; more

Corresponding email(s):   mahaizhu@126.com, gxye@mail.hz.zj.cn

Key Words:  Poly(dibenzyl itaconate)s, Mean-square radius of gyration, Temperature coefficient, Tacticity

MA Hai-zhu, YE Gao-xiang. Unperturbed dimensions of atactic poly(dibenzyl itaconate)s[J]. Journal of Zhejiang University Science A, 2007, 8(7): 991-998.

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%DOI 10.1631/jzus.2007.A0991

T1 - Unperturbed dimensions of atactic poly(dibenzyl itaconate)s
A1 - MA Hai-zhu
A1 - YE Gao-xiang
J0 - Journal of Zhejiang University Science A
VL - 8
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SP - 991
EP - 998
%@ 1673-565X
Y1 - 2007
PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.2007.A0991

The unperturbed dimension and temperature character of poly(dibenzyl itaconate)s (PDBzI) are studied by a revised rotational isomeric state (RIS) method. The improved formulas of the mean-square radius of gyration, deduced by the pseudo-stereochemical equilibrium approach, may be used to investigate the configurational-conformational properties of atactic polymers with large side groups [poly(itaconates) for instance]. The calculated results showed that poly(itaconates) have larger dimension of the molecule than other vinyl polymers. Comparison of the dimension between considering and without considering side groups showed that the effect of large side groups on the unperturbed dimension for short-chain polymers is more obvious than that of long-chain polymers and, if the dimension of side groups increases, the effect also increases. The dimension differences of PDBzI between short-chain and long-chain polymers are investigated by the relation of characteristic ratios and temperature coefficients with temperature. Moreover, the dependence between the temperature coefficients and the tacticity of chains shows that the temperature characters of the isotactic, syndiotactic and atactic PDBzI chains have remarkable difference.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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