過氧化物對高密度聚乙烯/碳黑複合材料正溫度係數行為影響之研究

Effect of peroxides on the positive temperature coefficient behaviors of high density polyethylene/carbon black composites

劉俊甫(Chun-Fu Liu)

指導教授 ： 黃繼遠

大同大學/工程學院/材料工程學系所/碩士(2004年)

摘要

中文摘要

本研究探討了高密度聚乙烯粒徑大小、碳黑添加量、電漿處理、60Coγ-ray輻射劑量、不同起始劑以及其添加量對高密度聚乙烯/碳黑複合材料之正溫度係數(Positive Temperature Coefficient, PTC)與負溫度係數(Negative Temperature Coefficient, NTC)效應的影響。另一方面也研究了高密度聚乙烯/碳黑複合材料的表面型態以及動態機械性質。從本研究中發現，複合材料的低溫電阻(T＜120°C)會隨著聚乙烯的粒徑變小以及電漿處理過後而降低，而複合材料的交聯密度也會因為聚乙烯經過電漿處理而增加。比較三種不同的起始劑，AIBN、BPO、DCP，其中以DCP能擁有較佳的效能去抑制NTC效應的產生。在本研究中，當複合材料的組成為下列所示時，PHDPE(40W,3min)/CB(35wt%)/DCP(2phr)， 不需使用60Coγ-ray輻射照射PTC強度就能擁有7.8個order；至於NTC效應則可以靠添加起始劑，電漿處理，以及60Coγ-ray輻射照射來消除。

關鍵字

碳黑 ； 高密度聚乙烯 ； 負溫度係數 ； 正溫度係數 ； 過氧化物 ； 電漿

並列摘要

Abstract

In this investigation, the effect of particle size of HDPE, carbon black content, plasma treatment, 60Co -ray irradiate dose, different initiators and content on the positive temperature coefficient(PTC) behavior and negative temperature coefficient(NTC) behavior of high density polyethylene/carbon black(HDPE/CB) composites were studied. On the other hand, the surface morphology observations and dynamic mechanical properties of HDPE/CB composite were also studied. The low temperature (T＜ 120°C) resistance of composites decreased with decreasing the size of PE and using plasma to treat polyethylene. The cross-linking density of composite could be increased by using plasma to treat PE. In comparison with the initiators, AIBN, BPO and DCP, DCP has a superior efficiency on restraint NTC effect occurred. In this investigation, the composition which possessed the 7.8 order of PTC intensity was PHDPE(40W,3min)/CB(35wt%)/DCP(2phr) without using 60Coγ-ray to irradiate. The NTC effect of composites could be eliminated by adding initiator, plasma treatment and 60Co -ray irradiation.

並列關鍵字

CB ； HDPE ； NTC ； peroxide ； plasma ； PTC

參考文獻

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