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Dynamics heterogeneity in silica‐filled nitrile butadiene rubber
Author(s) -
Xu Huilong,
Song Yihu,
Jia Erwen,
Zheng Qiang
Publication year - 2018
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.46223
Subject(s) - natural rubber , materials science , relaxation (psychology) , polymer , nitrile , composite material , phase (matter) , fragility , nitrile rubber , chemical engineering , polymer chemistry , chemistry , organic chemistry , psychology , social psychology , engineering
Nanoparticles significantly reinforce rubbers, but their influence on polymer dynamics is far from being understood. Here a comparison study of polymer dynamics in silica‐filled nitrile butadiene rubber compounds and their bound rubber in extracted filler gels is performed. Both the compounds and filler gels contain glassy, restricted, and mobile rubber fractions. The restricted fraction detected by broadband dielectric spectra exhibits a subsegmental relaxation that is two to four orders of magnitude slower than the segmental dynamics of the mobile phase. It is significant that the extractable fraction interacts with both the restricted and mobile fractions in the bound rubber, thus improving the activation energy of restricted relaxation and reducing the fragility of segmental relaxation in the mobile fractions. Meanwhile, the influences of loading, surface nature, and specific surface area of the silica on the dynamics heterogeneity are investigated. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46223.