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Functional silane‐modified calcium carbonate
Author(s) -
Nakatsuka Takuo,
Kawasaki Hitoshi,
Itadani Katsuhiko,
Yamashita Shinzo
Publication year - 1979
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.1979.070240906
Subject(s) - silane , polymer chemistry , calcium carbonate , materials science , polymerization , natural rubber , monomer , chemistry , chemical engineering , composite material , polymer , engineering
In the course of graft polymerization of styrene on a calcium carbonate powder surface treated with a silance coupling agent such as γ‐methacryloxypropyltrimethoxysilane, gelation of the reaction mixture was observed just as on silane‐modified clay. Infrared spectroscopic and gel‐permeation chromatographic studies have revealed that the extracts of styrene monomer from the powder surfaces contained polymeric silane coupling agent, having crosslinking ability, besides monomeric silane coupling agent. The catalytic effect on the condensation of the silane coupling agent on the powder surface was found to be increased in following order: CaCO 3 < P‐CaCO 3 < clay, where P‐CaCO 3 is a calcium carbonate modified with phosphoric acid. The order was parallel to the gelation tendency and to the acidity order ( H 0 ⩽ 6.8) on the surfaces. Direct evidence for bonding between the silane coupling agent and the phosphate moiety on calcium carbonate was not available; however, the silane‐modified P‐CaCO 3 filler exhibited more reinforcing effects in peroxide‐cured ethylene–propylene–diene rubber (EPDM) and in sulfur‐cured styrene–butadiene rubber (SBR) than the silane‐modified calcium carbonate. These reinforcing effects are also discussed in relation to the molecular weight distribution of the silane coupling agent extracted.