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Tensile properties of TiO 2 ‐filled poly(vinyl acetate) in the transition region
Author(s) -
Galperin I.,
Kwei T. K.
Publication year - 1966
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.1966.070100502
Subject(s) - materials science , ultimate tensile strength , composite material , strain rate , stress relaxation , volume fraction , relaxation (psychology) , modulus , glass transition , viscosity , young's modulus , polymer , creep , psychology , social psychology
The stress–strain properties of TiO 2 ‐filled poly(vinyl acetate) have been studied at filler percentages of 0, 10, 20, 30, and 40% TiO 2 over a strain‐rate range of 100–5000%/ min at 24°C. Tensile strength, Young's modulus, and offset yield strengths all were found to increase with higher strain rates and higher TiO 2 contents. Ultimate elongations decreased with greater TiO 2 content and higher strain rates. Shift factors for volume fraction of filler were estimated for tensile properties as function of test rate. Stress relaxation studies have shown a reduction in relaxation times with increasing TiO 2 content. Calculations of the out‐of‐phase Young's modulus were made as a function of filler content employing a box‐type of distribution of relaxation times. A possible explanation for the stress–strain behavior observed is that introduction of TiO 2 changes the internal viscosity of the system, similar to the effect of temperature. This would also mean that the ultimate properties would be dependent on filler content and strain rate because viscous resistance to chain deformation would be altered. The effect of filler on stress relaxation could be thought of being due to an increase in short‐range chain motion.