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首页> 外文会议>North American Thermal Analysis Society conference >Assessing the Effects of Process Temperature on Crystallization Kinetics of Polyphenylene Sulfide Utilizing Differential Scanning Calorimetry (DSC)
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Assessing the Effects of Process Temperature on Crystallization Kinetics of Polyphenylene Sulfide Utilizing Differential Scanning Calorimetry (DSC)

机译：利用差示扫描量热法（DSC）评估工艺温度对聚苯硫醚结晶动力学的影响

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摘要

The dependence of process melting temperature of polyphenylene sulfide (PPS) on crystallization temperature and kinetics was demonstrated by a simple DSC experiment in which the sample was held at isothermally at several temperatures above the equilibrium melting temperature for five minutes to destroy any crystals or other structure that may aid in nucleation. Cooling the samples at 10 C/ min showed the crystallization temperatures asymptotically converge at a crystallization temperature that corresponds to an isothermal hold temperature of 350 C or approximately 50 C above the equilibrium melting temperature. A non-isothermal kinetic study on PPS resin held at the lowest, highest and an intermediate isothermal temperature show a correlation in crystallization activation energy confirming that remaining 'seed' crystals or other structure aid in nucleation. The kinetic parameters were calculated from rate data obtained from non-isothermal or dynamic DSC experiments using the Avrami and Malkin macro kinetic models and Friedman's isoconversional approach using data taken directly from the DSC experiment.
机译：通过简单的DSC实验证明了聚苯硫醚（PPS）的工艺熔融温度对结晶温度和动力学的依赖性，其中将样品在高于平衡熔融温度的几个温度下等温保持5分钟，以破坏任何晶体或其他结构可能有助于成核。将样品以10℃/ min的速度冷却显示出结晶温度渐渐收敛于结晶温度，该结晶温度对应于等温保持温度350℃或比平衡熔融温度高约50℃。对在最低，最高和中间等温温度下保持的PPS树脂进行的非等温动力学研究表明，结晶活化能具有相关性，从而证实了剩余的“种子”晶体或其他结构有助于成核。动力学参数是根据使用Avrami和Malkin宏观动力学模型从非等温或动态DSC实验获得的速率数据以及直接从DSC实验获得的数据从Friedman的等转换方法计算而来的。

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