Effects of plasticization and hydrostatic pressure on tensile properties of PMMA under compressed carbon dioxide and nitrogen
Effects of plasticization and hydrostatic pressure on tensile properties of PMMA under compressed carbon dioxide and nitrogen
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DOI：
10.1002/app.43431
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发表时间：
2016-05
影响因子：
3
通讯作者：
T. Taguchi;H. Saito
中科院分区：
文献类型：
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作者：
T. Taguchi;H. Saito
我们研究了PMMA薄膜在压缩CO2和N2下的应力-应变行为。当CO2压力大于3 MPa时，随着CO2压力的增加，材料的断裂伸长率增加，应力降低，表明压缩CO2后材料的拉伸性能由脆性向韧性转变。相反，材料性能变得更脆下压缩CO2在压力低于2 MPa和压缩N2。通过将压缩气体减压并排除静水压力，气体吸收试样的性质从脆性变为韧性。这些结果表明，大量吸收气体引起的增塑效应增强了分子取向的变形能力，而少量吸收气体引起的静水压力效应则抑制了分子取向的变形能力。相反，弹性模量在压缩CO2和N2下均下降，但CO2下的下降幅度远大于N2下的下降幅度，这表明弹性区域的变形主要是由塑化效应决定的。© 2016 Wiley Periodicals，Inc. J.应用聚合物Sci.2016，133，43431.
We investigated the stress−strain behavior of PMMA films under compressed CO2and N2. The elongation at break increased and the stress decreased with increasing CO2pressure at pressures above 3 MPa, indicating that the tensile property changed from brittle to ductile under compressed CO2. In contrast, the material property became more brittle under compressed CO2at pressures below 2 MPa and under compressed N2. 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 CO2and N2, but the decrease under CO2was much larger than that under N2, suggesting that distortion in the elastic region is dominated by the plasticization effect. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci.2016,133, 43431.