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Peroxide crosslinking of Ziegler‐Natta thermoplastic polyolefins
Author(s) -
Bacci Dino,
Marchini Roberta,
Scrivani Maria Teresa
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.20012
Subject(s) - compression set , materials science , natta , peroxide , organic peroxide , composite material , thermoplastic , natural rubber , thermoplastic elastomer , catalysis , polymer chemistry , polymer science , polymerization , polymer , organic chemistry , chemistry , copolymer
A range of reactor grade TPO alloys (PP/EPM alloys from Ziegler‐Natta catalysis) were studied in order to evaluate their dynamic cross‐linkability, using a peroxide system. The amount of ethylene content in EPM rubber ranged from 28 to 77 wt%, to investigate the competition between vis‐breaking and cross‐linking during the peroxide reaction. Processing temperature and different peroxide/coagent ratios were the parameters varied in the present work. Cross‐linking degree was evaluated with Compression Set measurements and Dynamic Mechanical Analysis. It was therefore possible to find a correlation between the two analytical techniques. Feasibility of TPV rubbers with Compression Set at about 50% (22 h, 70°C) was demonstrated.