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The glassy transition of the polyethylene terephthalate (PET) sampleswhich have been subjected to solvent induced crystallization (SINC) was investigated bymodulated differential scanning calorimetry (MDSC) and density measurement. The dif-ferential of heat capacity signal, d C_p/dT from MDSC, was used to monitor the SINCprocess. It reveals that the T_g temperature shifts to higher value with the advancement ofSINC. When the toluene-immersing time was longer (168h), the detection of T_g becomemore difficult, because some smaller peaks emerged at the lower temperatures and theseare explained as the movement of small segments in the amorphous region. These observedresults are due to the morphology and structure introduced by the SINC process. 相似文献
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ffects of the chain orientation in the global sense on the solvent induced crystallization (SINC),diffusion velocity of toluol into poly(ethylene terephtlialate)(PET)and crystallization morphology were:studied by using density measurement and SEM.It has been shown that the SINC and diffusion velocity of toluol into PET increase with increasing degree of chain orientation in global sense,and the chain orientatioll can be essentially remained during SINC. 相似文献
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应用文献资料法,对运动性猝死的流行病学和病因学特征进行了探讨和分析。运动性猝死发生率虽低,但发展迅速,其发生与运动项目、运动强度之间没有明显关系,多发在30-60岁,男性多于女性。运动性猝死大多为心源性猝死和脑性猝死,其中冠状动脉粥样硬化是运动性猝死的主要原因。对运动性猝死发生的可能机制进行了探讨并提出了预防措施。 相似文献
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林辛 《福州大学学报(自然科学版)》1984,(2):31-40
本文阐述了微机中BCH码纠错的理论根据、方法及程序.提出了用增设内存缓冲区来提高CPU处理信息能力的简便方法。 相似文献
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讨论了低压断路器智能脱扣装置的设计思想、特点及算法.介绍了结构框图、热积累效应、电量放大器和复式电源 相似文献
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复杂用电系统的电压,其变化与许多影响因素有关而难以建立数学模型.传统的控制理论无法解决这类系统电压控制问题.本文提出模糊控制技术应用于上述用电系统,通过实验证明这种方法的有效性. 相似文献
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