Crystallization behaviors of polypropylene/montmorillonite nanocomposites

被引:184
作者
Ma, JS [1 ]
Zhang, SM [1 ]
Qi, ZN [1 ]
Li, G [1 ]
Hu, YL [1 ]
机构
[1] Chinese Acad Sci, Inst Chem, Ctr Mol Sci, State Key Lab Engn Plast, Beijing 100080, Peoples R China
关键词
crystallization kinetics; nanocomposites; montmorillonite; polypropylene;
D O I
10.1002/app.10127
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 isothermal crystallization kinetics of polypropylene/montmorillonite (PP/MMT) nanocomposites synthesized via intercalation polymerization were investigated by using differential scanning calorimeter and polarizing optical microscope (POM). The crystallinity of the nanocomposites decreased with the increase of the montmorillonite content, indicating that the M-NIT layers dispersed in the PP matrices confined the PP chains and hindered the crystallization of the PP chains. The POM photographs showed that the spherulites of the PP/MMT nanocomposites were greatly decreased in size as MMT was introduced. On the other hand, the crystallization rate increased dramatically with the increasing of MMT content. The interfacial free-energy per unit area perpendicular to PP chains in PP/MMT nanocomposites decreased with increasing MMT content, suggesting that the MMT layers acted as heterogeneous nuclei in the nucleation of crystallization. The nucleus density increased with the increasing of MMT content, leading to a positive effect on the crystallization. (C) 2002 John Wiley Sons, Inc.
引用
收藏
页码:1978 / 1985
页数:8
相关论文
共 18 条
[1]  
CHENG Y, 1998, ACTA POLYM SINICA, P6671
[2]   Non-isothermal crystallization of polymers [J].
Di Lorenzo, ML ;
Silvestre, C .
PROGRESS IN POLYMER SCIENCE, 1999, 24 (06) :917-950
[3]   Theoretical phase diagrams of polymer/clay composites: The role of grafted organic modifiers [J].
Ginzburg, VV ;
Singh, C ;
Balazs, AC .
MACROMOLECULES, 2000, 33 (03) :1089-1099
[4]   KINETICS OF POLYMER CRYSTALLIZATION FROM MELT (CALORIMETRIC APPROACH) [J].
GODOVSKY, YK ;
SLONIMSKY, GL .
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS, 1974, 12 (06) :1053-1080
[5]   AVRAMI ANALYSIS - 3 EXPERIMENTAL LIMITING FACTORS [J].
GRENIER, D ;
PRUDHOMME, RE .
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS, 1980, 18 (07) :1655-1657
[6]  
Hasegawa N, 1998, J APPL POLYM SCI, V67, P87
[7]  
Jiang SC, 2000, ACTA POLYM SIN, P452
[8]   Preparation and mechanical properties of polypropylene-clay hybrids [J].
Kawasumi, M ;
Hasegawa, N ;
Kato, M ;
Usuki, A ;
Okada, A .
MACROMOLECULES, 1997, 30 (20) :6333-6338
[9]   Structure and properties of a montmorillonite/polypropylene nanocomposite [J].
Kurokawa, Y ;
Yasuda, H ;
Kashiwagi, M ;
Oyo, A .
JOURNAL OF MATERIALS SCIENCE LETTERS, 1997, 16 (20) :1670-1672
[10]  
Liu LM, 1999, J APPL POLYM SCI, V71, P1133, DOI 10.1002/(SICI)1097-4628(19990214)71:7<1133::AID-APP11>3.0.CO