Premium
Dynamic mechanial properties of sulfonated cyclized cis ‐1,4‐polyisoprene
Author(s) -
Zhou Zheng Long,
Eisenberg A.
Publication year - 1982
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.1982.070270229
Subject(s) - dynamic mechanical analysis , glass transition , polymer chemistry , elastomer , ionic bonding , chemistry , materials science , organic chemistry , ion , polymer
Acetyl sulfate was used as sulfonating agent for the sulfonation of cis ‐1,4‐polyisoprene. IR and NMR spectra showed that the sulfonation was accompanied by extensive cyclization. A series of DSC and loss tangent studies of both the sodium salts and the methyl esters was undertaken. It was found that cyclization exerts a profound influence on the micrbrownian segmental motion of the hydrocarbon matrix and is the dominant factor in raising the glass transition temperatures. However, the differences in the mechanical properties between salts and esters suggest that the presence of ions does influence the melt viscosities and shear moduli of the sulfonated cyclized rubbers; this influence can be minimized by esterification or water absorption. It is seen that the ionic effects in these materials are quite typical of those encountered in a wide range of other ionomers.