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Sarafraz M. M. Tian Zhe Tlili I. Kazi Sabeena Goodarzi Marjan 《Journal of Thermal Analysis and Calorimetry》2020,139(4):2435-2445
Journal of Thermal Analysis and Calorimetry - In the present study, a set of experiments were accomplished to appraise the thermal performance and heat transfer of n-pentane-acetone and... 相似文献
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V.L. Rao P.U. Sabeena C. Gopalakrishnan P.V. Ravindran K.N. Ninan 《European Polymer Journal》2004,40(11):2645-2651
Polyether ether ketone and polyether ether ketone copolymers were prepared by the nucleophilic substitution reaction of 4,4′-difluorobenzophenone with hydroquinone and with varying mole proportions of hydroquinone and methyl hydroquinone using sulfolane solvent in the presence of anhydrous K2CO3. The polymers were characterised by different physico-chemical techniques. The crystallinity of the polymers was found to decrease with increase in concentration of the methyl hydroquinone units in the polymer. Thermogravimetric studies showed that all the polymers were stable upto 430 °C with a char yield above 49% at 900 °C in N2 atmosphere. The glass transition temperature was found to increase and the crystalline melting temperature and activation energy were found to decrease with increase in concentration of the methyl hydroquinone units in the polymer. 相似文献
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