変成ポリプロピレンとポリアミドとのポリマーアロイにおける成形品のウエルド強度
The Strength of the Weld Region of an Injection Molded Article of Modified Polypropylene and Polyamide Alloy
木之下正史・丹羽俊夫・柴田 欧
Kinoshita, Masafumi / Niwa, Toshio / Shibata, Ou
The strength and morphology of the weld region of injection molded test pieces of a polymer alloy of modified Polypropylene (m-PP) and Polyamide (PA) were studied. The effect of the composition and viscosity of m-PP, the condition of the reactive processing of PA and PP on the weld strength were examined.
FT-IR analysis confirmed the reaction between Anhydride group of Maleic m-PP and Amino group of PA. That new formation of covalent bonds is assumed to make the alloy compatible.
A microscopic observation of the weld region as well as the strength of the weld test pieces, suggested the weld strength strongly depended on the morphology of the weld region. The small size (<2μm) and globe-shape (not a thin filmy layer) of dispersed domain are found essential to the higher weld strength.
Key words: Polypropylene / Polyamide / Reactive processing / Weld strength