Thermally Expandable Microcapsules for Polymer Foaming-Relationship Between Expandability and Viscoelasticity

被引:44
作者
Kawaguchi, Yasuhiro [2 ]
Ito, Daichi [2 ]
Kosaka, Yoshiyuki [3 ]
Okudo, Masazumi [3 ]
Nakachi, Takeshi [4 ]
Kake, Hiroshi [4 ]
Kim, Jae Kyung [1 ]
Shikuma, Haruo [1 ]
Ohshima, Masahiro [1 ]
机构
[1] Kyoto Univ, Dept Chem Engn, Kyoto 6158510, Japan
[2] Sekisui Chem Co Ltd, Tokuyama High Performance Funct Plast Co, Special Chem Div, Yamaguchi 7460006, Japan
[3] Sekisui Chem Co Ltd, Minase High Performance Funct Plast Co, Special Chem Div, Shimamoto, Osaka 6180021, Japan
[4] Tokuyama Sekisui Co Ltd, Dept Polymer Prod, Yamaguchi 7460006, Japan
关键词
MICROSPHERES; PROPERTY;
D O I
10.1002/pen.21595
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
A new thermally expandable microcapsule was developed for use with foaming polypropylene (PP) by injection molding and extrusion processes at operating temperatures above 200 degrees C. The microcapsule consists of a blowing agent as the core and a shell polymer. The rheological properties of the shell polymer were controlled by a crosslinking agent to design the expandability and shrinkage. The effects of rheological properties on the expandability and the surface appearance of foam products were thoroughly investigated. It was found that storage modulus G' and tan delta significantly affected the expandability and shrinkage and were controllable through crosslinking polymerization. Visual observation of batch foaming, rheological measurement, and experiments of foam injection molding and extrusion elucidated the existence of the optimal degree of crosslinking that could realize more than 30% density reduction while maintaining a smooth surface at PP foam injection molding and extrusion. POLYM. ENG. SCI., 50:835-842, 2010. (C) 2009 Society of Plastics Engineers
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页码:835 / 842
页数:8
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