Crystallization kinetics and morphology of poly(trimethylene terephthalate)

被引:210
作者
Hong, PD [1 ]
Chung, WT [1 ]
Hsu, CF [1 ]
机构
[1] Natl Taiwan Univ Sci & Technol, Dept Fiber & Polymer Engn, Taipei 10607, Taiwan
关键词
poly(trimethylene terephthalate); crystallization; banded spherulite;
D O I
10.1016/S0032-3861(02)00163-5
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
In this work, the isothermal crystallization kinetics of polytrimethylene terephthalate (PTT) was first investigated from two temperature limits of melt and glass states. For the isothermal melt crystallization, the values of Avrami exponent varied between 2 and 3 with changing crystallization temperature, indicating the mixed growth and nucleation mechanisms. Meanwhile, the cold crystallization with an Avrami exponent of 5 indicated a character of three-dimensional solid sheaf growth with athermal nucleation. Through the analysis of secondary nucleation theory, the classical regime I --> II and regime II --> III transitions occurred at the temperatures of 488 and 468 K, respectively. The average work of chain folding for nucleation was ca. 6.5 kcal mol(-1), and the maximum crystallization rate was found to be located at ca. 415 K. The crystallite morphologies of PTT from melt and cold crystallization exhibited typical negative spherulite and sheaf-like crystallite, respectively. Moreover, the regime I --> II --> III transition was accompanied by a morphological transition from axialite-like or elliptical-shaped structure to banded spherulite and then non-banded spherulite, indicating that the formation of banded spherulite is very sensitive to regime behavior of nucleation. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:3335 / 3343
页数:9
相关论文
共 49 条
[1]   Granulation, Phase Change, and Microstructure - Kinetics of Phase Change. III [J].
Avrami, M .
JOURNAL OF CHEMICAL PHYSICS, 1941, 9 (02) :177-184
[2]   Kinetics of phase change I - General theory [J].
Avrami, M .
JOURNAL OF CHEMICAL PHYSICS, 1939, 7 (12) :1103-1112
[3]  
Avrami M., 1940, J CHEM PHYS, V8, P212, DOI [10.1063/1.1750631, DOI 10.1063/1.1750631]
[4]   CALCUL DE LECART QUADRATIQUE MOYEN ENTRE LES EXTREMITES DE DIVERSES CHAINES MOLECULAIRES DE TYPE USUEL [J].
BENOIT, H .
JOURNAL OF POLYMER SCIENCE, 1948, 3 (03) :376-388
[5]  
BROWN HS, 1997, CHEM FIBERS INT, V47, P72
[6]  
Chuah H, 1996, CHEM FIBER INT, V46, P424
[7]   Poly(trimethylene terephthalate) molecular weight and Mark-Houwink equation [J].
Chuah, HH ;
Lin-Vien, D ;
Soni, U .
POLYMER, 2001, 42 (16) :7137-7139
[8]   Crystallization kinetics of poly(trimethylene terephthalate) [J].
Chuah, HH .
POLYMER ENGINEERING AND SCIENCE, 2001, 41 (02) :308-313
[9]   Melting behavior of poly(trimethylene terephthalate) [J].
Chung, WT ;
Yeh, WJ ;
Hong, PD .
JOURNAL OF APPLIED POLYMER SCIENCE, 2002, 83 (11) :2426-2433
[10]  
Dangayach K, 1997, ANTEC'97 - PLASTICS SAVING PLANET EARTH, CONFERENCE PROCEEDINGS, VOLS 1 - 3, P2097