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Solution viscosities of ethylene–propylene copolymers in oils
Author(s) -
Rubin Isaac D.,
Sen Ashish
Publication year - 1990
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.1990.070400318
Subject(s) - copolymer , ethylene propylene rubber , ethylene , materials science , polymer science , chemical engineering , polymer chemistry , composite material , chemistry , organic chemistry , polymer , catalysis , engineering
Viscosities were obtained on oil solutions of ethylene‐propylene copolymers with 58‐80 mol% ethylene. For amorphous copolymers, intrinsic viscosities and equivalent hydrodynamic volumes showed little variation from −10 to 50°C. They decreased precipitously at low temperature for a partially crystalline copolymer with 80 mol% ethylene. The data can be explained by postulating that more ethylene and resulting crystallinity lead to ordered domains in solution at low temperatures, giving rise to additional contraction of the copolymer above that expected for a totally amorphous material.