Production of engineering plastics foams by supercritical CO2

被引：57

作者：

Liang, MT ^{[1
]}

Wang, CM ^{[1
]}

机构：

[1] I Shou Univ, Dept Chem Engn, Kaohsiung 84008, Taiwan

来源：

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH | 2000年 / 39卷 / 12期

关键词：

D O I：

10.1021/ie000062y

中图分类号：

TQ [化学工业];

学科分类号：

0817 [化学工程与技术];

摘要：

The foams of poly(ethylene terephthalate) (PET) and polycarbonate (PC) are prepared by rapid depressurization of CO2-saturated molten resin. It is found that the foamable temperature and pressure for PET and PC are nearly identical, and the attainable expansion ratio of the produced foam is generally less than 10. The effect of saturation temperature on the nucleation is mainly a result of the competition between the viscosity effect and the solubility effect. However, the effect of saturation pressure on the nucleation is twofold: the degree of supersaturation and the rate of depressurization. The effect of lowering the depressurization rate and changing the depressurization pattern on the polymeric foams is also investigated in this work. By careful observation of the microstructure, it is concluded that the foaming process is dominated by the nucleation kinetics. This study provides several alternative techniques for controlling the microstructure and the expansion ratio of PET and PC foams.

引用

页码：4622 / 4626

页数：5

共 12 条

[1]

A microcellular processing study of poly(ethylene terephthalate) in the amorphous and semicrystalline states .2. Cell growth and process design [J].