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Effect of octene content on peroxide crosslinking of ethylene–octene copolymers
Author(s) -
Svoboda Petr,
Poongavalappil Sameepa,
Theravalappil Rajesh,
Svobodova Dagmar,
Mokrejs Pavel
Publication year - 2013
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.4277
Subject(s) - octene , melt flow index , 1 octene , materials science , ethylene , copolymer , peroxide , polymer chemistry , composite material , chemistry , catalysis , polymer , organic chemistry
Various ethylene–octene copolymers were crosslinked by dicumyl peroxide. Octene content was 16, 20, 30, 35 and 38 wt% and melt flow index was 1 or 3 g/10 min. The concentration of dicumyl peroxide was 0.3, 0.5 and 0.7 wt%. Crosslinking was analyzed by a rubber process analyzer in the temperature range 150–200 °C. Cross‐linkability was evaluated from the real part modulus s ' max versus peroxide level plots as the slope of the line. With decreasing octene content and increasing melt flow index the crosslinkability increased. This was confirmed also by tan δ analysis. The network density was measured by the gel content. A higher gel content was found for melt flow index 3 and low octene content. The melting points T m and the crystallinities were evaluated by DSC. © 2012 Society of Chemical Industry