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首页> 外文期刊>Journal of Applied Polymer Science >Study of the electrical properties of flame retardant poly(vinylchloride) using positron annihilation lifetime spectroscopy
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Study of the electrical properties of flame retardant poly(vinylchloride) using positron annihilation lifetime spectroscopy

机译：用正电子lifetime没寿命光谱研究阻燃剂聚氯乙烯的电性能

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摘要

Since the large fire at the Brown Ferry cable plant which occurred at noon on March 22,1975 in Alabama, attention has been given to the use of flame retardant cable in buildings to meet fire safety requirements. Flame retardants are used in wire and cable applications to prevent the conversion of an electric spark into fire and subsequently to prevent the spread of fire throughout a structure along the wiring. There are many substances used as flame retardants in wires and cables. In Egypt, Multi-Purpose Reactor insulation and jacket cables have been constructed from a flame retardant substance, poly(vinylchloride) (PVC). In the present work, elemental and X-ray fluorescence analyses have been performed to determine the composition of PVC in the jacket cable samples. In addition, the conductivity (sigma), permittivity (epsilon'), and dielectric loss (epsilon") as well as positron annihilation lifetime (PAL) are measured in the temperature range 30 to 140 degrees C. It is found that the amount of chlorine in the flame-retardant PVC (FRPVC) jacket cable is significantly higher (5%) than the conventional PVC jacket cable. Inverse relationships between or and free volume size and fractions (V, f) through the temperature range are obtained. However, a distinct positive relationship between sigma and I-2, above 100 degrees C is found. The results of PAL and electrical measurements indicate that FRPVC has good electrical insulation properties below 100 degrees C. (c) 2005 Wiley Periodicals, Inc.
机译：自1975年3月22日中午在阿拉巴马州布朗渡轮电缆厂发生大火以来，人们一直在注意建筑物中使用阻燃电缆以满足消防安全要求。阻燃剂用于电线和电缆应用中，以防止将电火花转换成火，并随后防止火沿着布线遍布整个结构。电线电缆中有许多物质用作阻燃剂。在埃及，多功能反应堆绝缘和护套电缆是由阻燃物质聚氯乙烯（PVC）制成的。在目前的工作中，已经进行了元素和X射线荧光分析，以确定护套电缆样品中PVC的成分。另外，在30至140℃的温度范围内测量了电导率（sigma），介电常数（ε'）和介电损耗（ε“以及正电子an灭寿命（PAL）。阻燃PVC（FRPVC）护套电缆中的氯含量比常规PVC护套电缆中的氯含量高得多（5％），在温度范围内，自由体积尺寸与分数（V，f）之间存在反比关系。 （p）2005 Wiley Periodicals，Inc.在100摄氏度以上时，发现sigma与I-2之间存在明显的正关系，PAL和电学测量结果表明FRPVC在100摄氏度以下时具有良好的电绝缘性能。

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