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Preparation of amorphous silica
Author(s) -
Funnell N. A.,
Sirianni A. F.,
Puddington I. E.
Publication year - 1971
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450490419
Subject(s) - sodium silicate , amorphous silica , precipitated silica , natural rubber , materials science , amorphous solid , ultimate tensile strength , hydrophobic silica , chemical engineering , styrene , sol gel , sodium , composite material , nuclear chemistry , chemistry , organic chemistry , polymer , metallurgy , copolymer , nanotechnology , engineering
Amorphous silica having reinforcing properties for styrene butadiene rubber (SBR) was obtained by contacting silica aquagel seed, containing 1‐3% SiO 2 by weight, with a freshly prepared silica sol. Reinforcing by the isolated silica was greatly affected by the pH of the aquagel‐sol system and moderately affected by temperature and by the silica content of the aquagel seed. Maximum tensile strengths for the vulcanizates were found using the product obtained from a 2 to 2.5% silica aquagel seed‐sodium silicate system acidified with sulphuric acid to pH 3 at 85 to 95°C.