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Effect of mixed silanes on the hydrolytic stability of composites
Author(s) -
CRAIG R.G.,
DOOTZ E.R.
Publication year - 1996
Publication title -
journal of oral rehabilitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 93
eISSN - 1365-2842
pISSN - 0305-182X
DOI - 10.1046/j.1365-2842.1996.d01-194.x
Subject(s) - vinyltriethoxysilane , ultimate tensile strength , silanes , silane , materials science , composite material , composite number , silylation , nuclear chemistry , chemistry , organic chemistry , catalysis
A filler for a urethanedimethacrylate composite was silanated with mixtures of fluoroalkyl‐, aminoalkyl‐, phenyl‐, vinyl‐, bis silyl ethane‐ and 3‐methacryloxypropyltrimethoxysilane (MAOP) in an attempt to increase the hydrophobicity of the coupling agent layer. Diametral tensile strength was used to evaluate composites stored for (1) 24 h in 23°C (RT) air; (2) 24 h in RT air plus 24 h in 100°C air; (3) 24 h in RT air plus 24 h in 100°C water; and (4) 24 h in RT air plus 24 h in 100°C air plus 24 h in 100°C water. Water sorption and solubility of composites was also determined on samples stored for 24 h in RT air. Heating composites for 24 h in 100°C air increased the tensile strength in eight of 13 silane treatments, while heating in 100°C water for 24 h caused decreases for five silane treatments, no change for six and increases in tensile strength for two silane treatments. When composites that had been stored for 24 h at RT plus heated for 24 h in 100°C air were then heated for 24 h in 100°C water, only one silane treatment, the vinyltriethoxysilane at 25% (25% V), showed no significant decrease in tensile strength. Also, the composite silanated with 25% V had the highest value for tensile strength after storing for 24 h at RT air plus 24 h in 100°C air plus 24 h in 100°C water. These data indicate that the use of vinyltriethoxysilane increases the hydrolytic stability of the composite. Water sorption and solubility of the silanated composites were not satisfactory tests for evaluating hydrolytic stability of composites.