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Phase behavior of ethylene‐propylene rubber/hexane mixtures
Author(s) -
Vitali Manuele,
Pizzoli Maria
Publication year - 1998
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/(sici)1521-3935(19980301)199:3<429::aid-macp429>3.0.co;2-#
Subject(s) - ethylene propylene rubber , hexane , ethylene , natural rubber , polymer chemistry , polymer science , phase (matter) , butyl rubber , materials science , chemistry , organic chemistry , composite material , copolymer , polymer , catalysis
The phase behavior of EPR/hexane mixtures over the whole range of composition has been investigated by means of DSC. When the hexane content is lower than 37%, vitrification of the mixture hinders solvent crystallization and the composition dependence of the glass transition temperature ( T g ) is well described by the Gordon‐Taylor equation. At higher diluent concentration, T g is sufficiently lowered to allow crystallization and all hexane in excess with respect to 37% separates from the mixture. Calorimetric curves also reveal the presence of a small amount of low‐melting crystallinity due to EPR component, strictly dependent on polymer concentration. The conclusion is drawn that the increase of mobility induced by plasticization does not enhance the crystallization capability of EPR macromolecules.