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Effects of polymeric curing agent modified with silazanes on the mechanical properties of silicone rubber
Author(s) -
Dai Lina,
Zhang Zhijie,
Zhao Yunfeng,
Liu Hongming,
Xie Zemin
Publication year - 2008
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.29063
Subject(s) - curing (chemistry) , natural rubber , polydimethylsiloxane , silicone rubber , materials science , composite material , dynamic mechanical analysis , swelling , mooney viscosity , elastomer , polymer chemistry , chemical engineering , polymer , copolymer , engineering
Abstract Polymeric curing agent modified with hexamethyldisilazane (PCA‐D), or with hexamethylcyclotrisilazane (PCA‐T), was used to improve the mechanical properties of hydroxyl‐teminated polydimethylsiloxane (PDMS) rubber. The structure and the gel time of PCA were characterized by 29 Si NMR and shear viscosity measurement, respectively. The PCA modified with silazanes was more stable in storage than that without treatment (PCA‐0). Chemical bonds were formed during the reaction of silazanes and PCA according to 29 Si NMR results. The crosslink density (γ e ) and the mechanical properties of PCA/PDMS rubber were determined by swelling equilibrium and stress–strain tests. It was found that PCA treated with both silazanes could better enhance the mechanical properties of PCA/PDMS rubber compared with PCA‐0. PCA‐T/PDMS rubber, with additional crosslinks, was the best among the three types of PCA/PDMS rubber on the mechanical properties. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009