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Sequential injection overmolding of an elastomeric ethylene‐octene copolymer on a polypropylene homopolymer core
Author(s) -
Arzondo L. M.,
Pino N.,
Carella J. M.,
Pastor J. M.,
Merino J. C.,
Póveda J.,
Alonso C.
Publication year - 2004
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.20216
Subject(s) - polypropylene , materials science , copolymer , octene , polymer , elastomer , composite material , ethylene , core (optical fiber) , 1 octene , polymer science , polymer chemistry , catalysis , organic chemistry , chemistry
A systematic approach was used to study and compare the bonding of an ethylene‐octene random copolymer and a low‐density polymer, injection molded over polypropylene homopolymer. Wide ranges of overmolding and cooling interface temperatures and packing pressures were explored. Standard peeling tests were conducted at room temperature on overmolded samples, to measure the bonding strength. Large differences were found for bonding strength for both ethylene‐based polymers, which are explained on a molecular basis. The analysis of the experimental results gives strong indications about the bonding mechanism and the temperatures and time scaleinvolved in the process. Simple, reliable rules to design the overmolding process parameters for these polymers pairs are developed. Polym. Eng. Sci. 44:2110–2116, 2004. © 2004 Society of Plastics Engineers.