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Open AccessArticle

Characterization of Engineering Plastics Plasticized Using Supercritical CO2

Department of Material-Based Medical Engineering, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, Tokyo 101-0062, Japan
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Polymers 2020, 12(1), 134; https://doi.org/10.3390/polym12010134
Received: 25 November 2019 / Revised: 19 December 2019 / Accepted: 31 December 2019 / Published: 6 January 2020
The purpose of this study was to evaluate the physical and chemical properties of engineering plastics processed using supercritical CO2. First, we prepared disk-shaped test pieces via a general molding process, which were plasticized using supercritical CO2 at temperatures lower than the glass-transition points of engineering plastics. Amorphous polymers were plasticized, and their molecular weight remained nearly unchanged after treatment with supercritical CO2. The mechanical strength significantly decreased despite the unchanged molecular weight. The surface roughness and contact angle increased slightly, and electrical properties such as the rate of charging decreased significantly. These results suggest that supercritical CO2 could be used for a new molding process performed at lower temperatures than those used in general molding processes, according to the required properties. View Full-Text
Keywords: engineering plastics; polycarbonate; polysulfone; polyarylate; supercritical CO2 engineering plastics; polycarbonate; polysulfone; polyarylate; supercritical CO2
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Watanabe, M.; Hashimoto, Y.; Kimura, T.; Kishida, A. Characterization of Engineering Plastics Plasticized Using Supercritical CO2. Polymers 2020, 12, 134.

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