Considerable Different Frequency Dependence of Dynamic Tensile Modulus between Self-Heating (Joule Heat) and External Heating for Polymer鈥揘ickel-Coated Carbon Fiber Composites

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• 作者：Rong Zhang ; Yuezhen Bin ; Enyuan Dong ; Masaru Matsuo
• 刊名：Journal of Physical Chemistry B
• 出版年：2014
• 出版时间：June 26, 2014
• 年：2014
• 卷：118
• 期：25
• 页码：7047-7058
• 全文大小：744K
• ISSN：1520-5207

文摘

Dynamic tensile moduli of polyethylene鈥搉ickel-coated carbon fiber (NiCF) composites with 10 and 4 vol % NiCF contents under electrical field were measured by a homemade instrument in the frequency range of 100鈥?.01 Hz. The drastic descent of the storage modulus of the composite with 10 vol % was verified in lower frequency range with elevating surface temperature (T_s) by self-heating (Joule heat). The composite was cut when T_s was beyond 108 掳C. On the other hand, the measurement of the composite with 4 vol % beyond 88 掳C was impossible, since T_s did not elevate because of the disruption of current networks. Incidentally, the dynamic tensile moduli by external heating could be measured up to 130 and 115 掳C for 10 and 4 vol %, respectively, but the two composites could be elongated beyond the above temperatures. Such different properties were analyzed in terms of crystal dispersions, electrical treeing, and thermal fluctuation-induced tunneling effect.