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Studies on the Condensed Structure of Vacuum Cast Atactic Polystyrene Films

Studies on the Condensed Structure of Vacuum Cast Atactic Polystyrene Films
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摘要 The condensed structure of atactic-polystyrene (a - PS ) films cast from the solutions of differ- ent concentrations in dichloromethane under vacuum and atmospheric conditions was studied by differential scanning calorimetry(DSC). It was found that only under vacuum evaporating conditions did the endothermic peak in the DSC curves of a-PS films depend on the concentration of the a-PS solution. For the samples cast from the solution of concentration below 0. 010 g/mL, no endothermal peak was observed, but for those cast from the solution of concentration above 0. 020 g/mL, obvious endothermal peaks appeared. The onset of the endothermal peak is correlated with the critical overlapping concentration c' (0. 010-0. 020 g/mL), which is in agreement with the theoretically calculated one (Ccal=0.014 g/mL). The condensed structure of atactic-polystyrene (a - PS ) films cast from the solutions of differ- ent concentrations in dichloromethane under vacuum and atmospheric conditions was studied by differential scanning calorimetry(DSC). It was found that only under vacuum evaporating conditions did the endothermic peak in the DSC curves of a-PS films depend on the concentration of the a-PS solution. For the samples cast from the solution of concentration below 0. 010 g/mL, no endothermal peak was observed, but for those cast from the solution of concentration above 0. 020 g/mL, obvious endothermal peaks appeared. The onset of the endothermal peak is correlated with the critical overlapping concentration c' (0. 010-0. 020 g/mL), which is in agreement with the theoretically calculated one (Ccal=0.014 g/mL).
出处 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2000年第4期363-368,共6页 高等学校化学研究(英文版)
基金 Supported by the National Key Fundamental Research-" Macromolecular Condensed State" the State Scienceand Technology Commissio
关键词 Differential scanning calorimeter(DSC) Critical overlapping concentration Atactic polystyrene film Differential scanning calorimeter(DSC), Critical overlapping concentration, Atactic polystyrene film
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