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Surface modification of vulcanized rubber by radiation grafting, part 1: Improvement in friction behavior
Author(s) -
Mizote N.,
Katakai A.,
Tamada M.,
Matsuoka H.
Publication year - 2010
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.32159
Subject(s) - contact angle , materials science , natural rubber , monomer , vulcanization , polymerization , grafting , methacrylate , wetting , composite material , polymer chemistry , silane , copolymer , surface roughness , abrasion (mechanical) , polymer
Hydrophilic monomer, 2‐hydroxyethyl methacrylate (HEMA), and hydrophobic monomer, 3‐(methacryloyloxy)propyltris(trimethylsiloxy)silane (MPTS) were grafted on vulcanized rubber surface with simultaneous electron beam irradiation. Degree of graft polymerization was evaluated by composition ratio of imparted graft chain against trunk rubber. The composition ratio could be controlled by the monomer concentration and the irradiation dose. Grafted rubbers were evaluated by surface roughness and contact angle. Graft polymerization of HEMA decreased the contact angle from 93 to ∼ 70° without considerable change of the surface roughness. In the case of MPTS, the contact angle increased approximately to 108°. The relationship between the contact angle of water on the modified surface and the friction at the moment of semi‐dry was investigated as an application of the resulting rubber to wiper blade. The increase of the contact angle owing to the grafting of hydrophobic MPTS led to the decrease of Δμ (deference between semi‐dry state and dry friction). Instead, the decrease of the contact angle by grafting of hydrophilic HEMA resulted in the increase of Δμ. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010