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Effects of plasticization and hydrostatic pressure on tensile properties of PMMA under compressed carbon dioxide and nitrogen
Author(s) -
Taguchi Tomoaki,
Saito Hiromu
Publication year - 2016
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.43431
Subject(s) - materials science , ultimate tensile strength , composite material , compressed natural gas , brittleness , hydrostatic pressure , plasticizer , elongation , compressive strength , carbon dioxide , hydrostatic equilibrium , elastic modulus , thermodynamics , chemistry , organic chemistry , physics , quantum mechanics
We investigated the stress−strain behavior of PMMA films under compressed CO 2 and N 2 . The elongation at break increased and the stress decreased with increasing CO 2 pressure at pressures above 3 MPa, indicating that the tensile property changed from brittle to ductile under compressed CO 2 . In contrast, the material property became more brittle under compressed CO 2 at pressures below 2 MPa and under compressed N 2 . By depressurizing the compressed gas and excluding the hydrostatic pressure, the property of the gas‐absorbed specimen changed from brittle to ductile. These results suggest that deformability by molecular orientation is enhanced by the plasticizing effect caused by a large amount of absorbed gas while it is suppressed by the effect of hydrostatic pressure caused by a small amount of absorbed gas. Conversely, the elastic modulus decreased under both compressed CO 2 and N 2 , but the decrease under CO 2 was much larger than that under N 2 , suggesting that distortion in the elastic region is dominated by the plasticization effect. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43431.