GROWTH-RATE OF ISOTACTIC POLYSTYRENE CRYSTALS IN CONCENTRATED-SOLUTIONS AND IN THE MELT

被引：19

作者：

MIYAMOTO, Y

TANZAWA, Y

MIYAJI, H

KIHO, H

机构：

[1] KYOTO UNIV,FAC SCI,DEPT PHYS,KYOTO 60601,JAPAN

[2] NAGOYAGAKUIN UNIV,SETO,AICHI 48012,JAPAN

来源：

POLYMER | 1992年 / 33卷 / 12期

关键词：

GROWTH RATE; ISOTACTIC POLYSTYRENE; HIGH SUPERCOOLING; TRANSPORT FACTOR; CONCENTRATED SOLUTION; ROUGH-SURFACE GROWTH;

D O I：

10.1016/0032-3861(92)91129-P

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 growth rate of isotactic polystyrene (iPS) crystals has been investigated for crystallization in concentrated dimethyl phthalate solutions and in the melt over a wide range of supercooling from 20 to 170 K. For most of the supercoolings studied, the growth faces are rough; nucleation is not present. However, the growth rate G for each concentration shows approximately the same dependence on supercooling DELTA-T as growth controlled by secondary nucleation: log(G/beta) depends linearly on K/T-DELTA-T, where beta is a transport factor and K is a constant. The value of K increases with decreasing concentration. Possible mechanisms for crystal growth are discussed, taking account of the deposition of one stem on growth faces; the side surface free energy increases with decreasing concentration.

引用

页码：2496 / 2501

页数：6

共 23 条

[11] SOLUTION OF THE GROWTH EQUATIONS OF A SECTOR OF A POLYMER CRYSTAL INCLUDING CONSIDERATION OF THE CHANGING SIZE OF THE CRYSTAL [J].