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Adhesion control for injection overmolding of polypropylene with elastomeric ethylene copolymers
Author(s) -
Dondero Marco,
Pastor José M.,
Carella José M.,
Perez Claudio J.
Publication year - 2009
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.21415
Subject(s) - polypropylene , materials science , copolymer , adhesion , elastomer , ethylene , composite material , octene , crystallinity , polymer chemistry , polymer , polymer science , organic chemistry , chemistry , catalysis
Two types of random semicrystalline copolymers (ethylene–octene and ethylene–butene) were overmolded on a core polypropylene. Maximum solid–liquid interface temperature achieved for the overmolding injection process is used as the key parameter for adhesion control. The main bonding process is shown to be a Rouse‐type fingering mechanism that develops in short time scales. Normalized peel tests were conducted on overmolded samples to measure the resulting polypropylene copolymers' bonding strength. All the ethylene random copolymers used for this study give good adhesion to polypropylene in overmolding processes, provided the right range of interface temperature is reached. Adhesion strength can be easily controlled for efficient debonding and recycling of used overmolded parts. POLYM. ENG. SCI., 2009. © 2009 Society of Plastics Engineers