Chain stiffness of liquid crystalline polyesters. 2. Radius of gyration and intrinsic viscosity

被引：5

作者：

Bicerano, J ^{[1
]}

Brewbaker, JL ^{[1
]}

Chamberlin, TA ^{[1
]}

机构：

[1] Dow Chem Co, ME Pruitt Res Ctr, Midland, MI 48674 USA

来源：

COMPUTATIONAL AND THEORETICAL POLYMER SCIENCE | 1998年 / 8卷 / 1-2期

关键词：

chain stiffness; liquid crystallinity; polyester;

D O I：

10.1016/S1089-3156(98)00037-3

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Continuing from the previous paper on novel liquid crystalline polymers containing the dihydroxy-alpha-methylstilbene (DH alpha MS) fragment, several conclusions were reached for random terpolymers of DH alpha MS terephthalate, DH alpha MS isophthalate and DH alpha MS 2,6-naphthoate; in mole fractions of 0.65, 0.10 and 0.25, respectively; by atomistic simulations and experimental work on effects of weight-average molecular weight (M-W) on the radius of gyration (R-g) and intrinsic viscosity [eta]: 1. The polydispersities of the samples are around 2.16, a typical value for condensation polymers. 2. The observed R-gw, (weight-average R-g) and [eta] values are both roughly proportional to M-w(0.7). 3. The calculated R-g values are also similar to M-w(0.7) and comparable to the observed R-gw values. 4. The calculated [eta] similar to M-w(0.85) land thus have a very similar exponent for the M-w dependence, but are larger than the observed values of [eta] by roughly a factor of 6 over the entire range of M-w. (C) 1998 Elsevier Science Ltd. All rights reserved.

引用

页码：15 / 20

页数：6

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