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Characterization of network structure of rubber vulcanizate by monsanto moving die rheometer (MDR 2000)
Author(s) -
Roychoudhury A.,
De S. K.
Publication year - 1993
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.1993.070500507
Subject(s) - vulcanization , rheometer , curing (chemistry) , covalent bond , elastomer , natural rubber , materials science , ionic bonding , cross link , polymer chemistry , composite material , rheology , polymer science , chemistry , polymer , organic chemistry , ion
While studying the curing of rubbers in a moving die rheometer, the viscous component ( S ″) of the measured torque increases with the formation of ionic cross‐linking. But the covalent cross‐linking of elastomers is manifested by a decreases in S ″. The mixed cross‐linking system, however, shows an initial rise in S ″ value due to ionic cross‐linking, followed by a decrease in S ″ due to covalent cross‐linking. As curing progresses, the elastic component ( S ′) of the measured torque in the case of a mixed cross‐linking system increases in two steps: The first step is due to ionic cross‐link formation, and the second step, to covalent cross‐link formation. The moving die rheometer can be useful in assessing not only the extent of cross‐linking, but also the type of cross‐links formed during the vulcanization of rubbers. © 1993 John Wiley & Sons, Inc.