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A Thermal Decomposition and Glass Transition Temperature Study of Poly(p-chlorostyrene) |
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| Authors: | S L Malhotra P Lessard L P Blanchard |
| Institution: | 1. Xerox Research Centre of Canada , 2480 Dunwin Drive, Mississauga, Ontario, Canada , L5L 1J9;2. Centre de Recherche pour la Defense, Division de la propulsion , Valcartier, C. P. 880, Courcelette, Quebec, Canada , G0A 1R0;3. Groupe de Recherches en Sciences Macromoléculaires Département de Génie chimique Faculté , des Sciences et de Génie Université Laval Quebec , Quebec, Canada , G1K 7P4 |
| Abstract: | Abstract The thermal decomposition and the glass transition temperature of poly(p-chlorostyrene) (PpCIS) were studied with a Model 2 differential scanning calorimeter (DSC). The undecom-posed and decomposed polymers were analyzed by gel permeation chromatography for molecular weight distributions and by DSC for changes in the polymer glass transition temperature. The decomposition of PpCIS under isothermal conditions during 50 min intervals at various temperatures or at a fixed temperature (320°C) but for different periods is characterized by the disappearance of increasing quantities of high molecular weight polymer and the appearance of low molecular weight products. Random scissions have been shown to break down the polymer chains which depolymerize into volatile products. Activation energy (72 kcal/mole) for the decomposition of PpCIS is lower than that (103 kcal/mole) for the decomposition of polystyrene. |
| Keywords: | Cu(II)L macrocyclic complex DNA cleavage bind constant |