Thermal oxidation and molding feasibility of cycloolefin copolymers (COCs) with high glass transition temperature |
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Authors: | Mark O Liu Hong-Fan Lin Ming-Ching Yang Mei-Jyun Lai Chih-Chieh Chang Ming-Cheng Feng Po-Ling Shiao In-Mau Chen |
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Institution: | Union Chemical Laboratories, Industrial Technology Research Institute, Hsinchu 300, Taiwan, ROC |
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Abstract: | Cycloolefin copolymers (COCs) with high glass transition temperature (Tg = 203 °C) have been synthesized and pelletized by extrusion molding. However, their colors change from transparent to yellow during extrusion molding because of thermal oxidation and generation of alkene groups. We have successfully blended several antioxidants (Irganox 1010, Irgafos 168, Irganox HP2225 and Irganox HP2921) into lab-made COCs to avoid the discoloration. The experimental results show that Irganox HP2921 is the best antioxidant among the antioxidants used and can effectively not only suppress thermal oxidation but also eliminate the color stain. |
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Keywords: | Cycloolefin copolymer Extrusion molding Discoloration Color stain Antioxidant |
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