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Dynamic viscoelastic properties of photo‐activated composite resins containing short glass fibres
Author(s) -
Kanayama H.,
Kanie T.,
Inoue K.
Publication year - 2000
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 - 10.1111/j.1365-2842.2000.00613.x
Subject(s) - composite material , materials science , viscoelasticity , glass fiber , thermal expansion , composite number , absorption of water , modulus , glass transition , thermal , polymer , physics , meteorology
The dynamic shear modulus in torsion ( G ′), water absorption, thermal expansion and residual monomer of the reinforced materials produced by adding four short glass fibres (19 μm in mean diameter and 86·1–763 μm in mean length) and one spherical E glass (11·1 μm in mean diameter) were examined and discussed in comparison with those of the materials without filler. G′ of short fibre reinforced composites increased with fibre length and reached a maximum value near 382 μm for a dry specimen and near 156 μm for a wet one. In addition, the coefficient of thermal expansion of the fibre reinforced composites and the amount of residual monomer decreased considerably compared with those of composites containing spherical glass. There was no significant difference in water absorption between the fibre reinforced composites and the composites containing spherical glass. Therefore, it was concluded that the reinforcement method of adding short glass fibres is favourable for improving the viscoelastic properties of the materials.