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Crosslinking reactions in pigmented olefinic polymers
Author(s) -
Houde Carolyn,
Schreiber H. P.,
Rudin Alfred
Publication year - 1992
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1992.070461118
Subject(s) - degree of unsaturation , polymer , polyethylene , rutile , natural rubber , polymer chemistry , chemistry , ethylene propylene rubber , kinetics , low density polyethylene , chemical engineering , materials science , organic chemistry , copolymer , physics , quantum mechanics , engineering
Thermally initiated crosslinking reactions have been studied in a linear low‐density polyethylene, and an ethylene—propylene rubber. The polymers contained conventional thermal stabilizers or one of three surface‐coated rutile pigments. Enthalpies of crosslinking and reaction kinetics depended on the degree of terminal vinyl unsaturation in the polymers, that characteristic being greater in the rubber than in the polyethylene. The presence of thermal stabilizers did not exert any measurable influence on measured parameters of the crosslinking processes. The effects of rutile varied, depending on their surface acidity or basicity, as determined from chromatographic measurements. Basic rutile was found to reduce heats and to slow rates of reaction, while acidic rutiles did not affect the reactions. These observations may be attributed to interaction between the basic pigment surface and acidic moieties involved in the crosslinking reaction. © 1992 John Wiley & Sons, Inc.