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Dechlorination of poly(vinyl chloride) by microwave irradiation I: A simple examination using a commercial microwave oven |
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| Authors: | M. Ito K. Ushida N. Nakao R. Nozaki M. Washio |
| Affiliation: | a RIKEN (The Institute of Physics and Chemical Research), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan b Advanced Research Institute for Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan c Mechanical Engineering Research Laboratory, Kobe Steel Ltd., Takatukadai, Nishi-ku, Kobe 651-2271, Japan d Division of Physics, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan |
| Abstract: | Poly(vinyl chloride) (PVC) was decomposed by microwave (MW) irradiation (2.45 GHz) using a commercial MW oven. The efficiency of dielectric absorption was evaluated quantitatively from the rate of temperature increase on MW irradiation. The efficiency of dielectric heating increased at temperatures above the glass transition temperature (Tg). The decomposition on MW irradiation, monitored using the weight, depended on the initial (preheating) temperature of the sample before irradiation. The degradation time profile with various initial temperatures was shifted along the time axis and was successfully superimposed on a single curve. A pure PVC film was subjected to heating at a constant temperature from 230 °C to 310 °C, and the rate of weight decrease on heating was measured. The apparent activation energy was 84.4 kJ/mol for a single monomer unit. |
| Keywords: | Dechlorination Dielectric constant Dielectric heating Microwave PVC Plastic wastes |
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