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Macroscopic and Microscopic Analyses of Hydrophobic Modification of Rubbers with Silica Nanoparticles

Author:
Ye, Yi, Zhang, Chen, Tian, Ming, Du, Zhongjie, Mi, Jianguo
Source:
The Journal of Physical Chemistry C 2015 v.119 no.36 pp. 20957-20966
ISSN:
1932-7455
Subject:
chemical bonding, chemical composition, contact angle, droplets, durability, hydrophobicity, methodology, nanoparticles, rubber, silica, wettability
Abstract:
The wettability of rubbers with silica nanoparticle modification was investigated with theory and experiment. A simple coating technology was applied to generate the superhydrophobic styrene–butadiene rubber (SBR). Silica nanoparticles were covalently bonded with γ-methacryloxy propyl trimethoxysilane (γ-MPTMS), which was employed to improve coating durability through the thiol–ene click reaction with the SBR matrix. The contact angles of water droplets on the net and modified surfaces were then measured. The application of a three-dimensional density functional theory approach to predict the wetting contact angles showed that the chemical composition, chain conformation, and micro/nanostructure have different contributions to the hydrophobic behaviors. The theoretically predicted contact angles were partly validated by their experimental counterparts.
Agid:
5642767