Thermally expandable microcapsules for polymer foaming-Relationship between expandability and viscoelasticity

• Published in: Polymer engineering and science 2010-04, Vol.50 (4), p.835-842
• Main Authors: Kawaguchi, Yasuhiro, Ito, Daichi, Kosaka, Yoshiyuki, Okudo, Masazumi, Nakachi, Takeshi, Kake, Hiroshi, Kim, Jae Kyung, Shikuma, Haruo, Ohshima, Masahiro
• Format: Article
• Language: English
• Subjects: Applied sciences; Cellular; Crosslinking polymerization; Exact sciences and technology; Expansion & contraction; Forms of application and semi-finished materials; Materials science; Polymer industry, paints, wood; Polymers; Technology of polymers; Viscoelasticity
• ISSN: 0032-3888; 1548-2634
• DOI: 10.1002/pen.21595

A new thermally expandable microcapsule was developed for use with foaming polypropylene (PP) by injection molding and extrusion processes at operating temperatures above 200°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 δ 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 smoothsurface at PP foam injection molding and extrusion. POLYM. ENG. SCI., 2010. © 2009 Society of Plastics Engineers