Shear induced crystallization in poly(ε-caprolactone):: effect of shear rate

被引：52

作者：

Lellinger, D

Floudas, G

Alig, I

机构：

[1] Univ Ioannina, Dept Phys, GR-45110 Ioannina, Greece

[2] FORTH, Biomed Res Inst, Ioannina, Greece

[3] Deutsch Kunststoff Inst Darmstadt, D-64289 Darmstadt, Germany

来源：

POLYMER | 2003年 / 44卷 / 19期

关键词：

crystallization; shear; poly(epsilon-caprolactone);

D O I：

10.1016/S0032-3861(03)00633-5

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

We have studied the effect of shear rate on the very early stages of poly(epsilon-caprolactone) crystallization with in situ rheology and ex situ optical microscopy. The effect of shear rate is mainly to increase the nucleation density and to speed-up the crystallization process. Thermally-induced crystallization is separated from strain-induced crystallization allowing the construction of a 'master curve' indicating that the system obeys the shear rate-temperature-superposition. It was found that the free enthalpy difference in the melt G(m)((gamma) over dot,T) - G(m)((gamma) overdot = 0,T) increases with the shear rate ((gamma) over dot) that can be qualitatively rationalized by the reduced entropy of the melt prior to crystallization. (C) 2003 Elsevier Ltd. All rights reserved.

引用

页码：5759 / 5769

页数：11

共 39 条

[1] Viscoelastic contrast and kinetic frustration during poly(ethylene oxide) crystallization in a homopolymer and a triblock copolymer. Comparison of ultrasonic and low-frequency rheology [J].