MORPHOLOGICAL-CHANGES IN ISOTACTIC POLYPROPYLENE AS A FUNCTION OF COOLING RATE

被引:137
作者
PICCAROLO, S
机构
[1] Dip. Ingegneria Chimica dei Processi e dei Materiali, 90128, Palermo, Viale delle Scienze
来源
JOURNAL OF MACROMOLECULAR SCIENCE-PHYSICS | 1992年 / B31卷 / 04期
关键词
D O I
10.1080/00222349208215467
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
A new method for monitoring rather than controling thermal history has been applied recently to analyze the crystallization kinetics at high cooling rate of a highly pure isotactic polypropylene, proving that the cooling history relevant to the structure of quenched samples is in the neighborhood of 90-degrees-C. A continuous variation of morphology and crystal structure was obtained with cooling rate. At cooling rates above 20-degrees-C/s, mesomorphic and alpha-monoclinic phases coexist with a morphology characterized by negatively birefringent spherulites surrounded by a weakly birefringent medium; below this value of cooling rate only alpha-monoclinic phase is formed, composed of mixed spherulites.
引用
收藏
页码:501 / 511
页数:11
相关论文
共 19 条
[1]   CRYSTALLIZATION OF POLYMER MELTS UNDER FAST COOLING .1. NUCLEATED POLYAMIDE-6 [J].
BRUCATO, V ;
CRIPPA, G ;
PICCAROLO, S ;
TITOMANLIO, G .
POLYMER ENGINEERING AND SCIENCE, 1991, 31 (19) :1411-1416
[2]   ON THE STRUCTURE OF THE QUENCHED MESOMORPHIC PHASE OF ISOTACTIC POLYPROPYLENE [J].
CORRADINI, P ;
PETRACCONE, V ;
DEROSA, C ;
GUERRA, G .
MACROMOLECULES, 1986, 19 (11) :2699-2703
[3]  
DECANDIA F, 1987, J APPL POLYM SCI, V34, P689
[4]  
DECANDIA F, 1987, COLLOID POLYM SCI, V265, P697
[5]  
GEZOVICH DM, 1968, POLYM ENG SCI, V8, P210, DOI DOI 10.1002/PEN.760080306
[6]  
GEZOVICH JDM, 1968, POLYM ENG SCI, V8, P202
[7]   SOME CRYSTALLIZATION KINETICS OF ISOTACTIC POLYPROPYLENE [J].
GLOTIN, M ;
RAHALKAR, RR ;
HENDRA, PJ ;
CUDBY, MEA ;
WILLIS, HA .
POLYMER, 1981, 22 (06) :731-735
[8]  
GRUBB DT, 1986, POLYM COMMUN, V27, P84
[9]  
HENDRA PJ, 1984, POLYMER, V25, P785, DOI 10.1016/0032-3861(84)90007-7
[10]   STRUCTURE AND PROPERTIES OF POLYPROPYLENE CRYSTALLIZED FROM THE GLASSY STATE [J].
HSU, CC ;
GEIL, PH ;
MIYAJI, H ;
ASAI, K .
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS, 1986, 24 (10) :2379-2401