聚烯類低溫正溫度係數熱敏電阻之開發與研究

The investigation and development of polyolefin low temperature positive temperature coefficient thermistor

胡伯謙(Po-Chian Hun)

指導教授 ： 黃繼遠

大同大學/工程學院/材料工程學系所/碩士(2006年)

摘要

本實驗用EVA和碳黑混煉製備低溫正溫度係數材料。本論文研究碳黑種類、碳黑含量、塑化劑添加量、元件厚度、電漿處理、加工方法、基材對複材PTC行為的影響。
本研究，使用碳黑 Monarch 120、N660、Vulcan XC-72及 Raven 430 ultra 和EVA 633混煉，實驗結果發現N660/EVA 633所製備的PTC複材有較好之R-T曲線。研究亦發現，以40wt % 碳黑與EVA 633 混煉可製備R-T行為較佳的複材。在起始劑方面，本研究添加BPO促使EVA交聯，如此可抑制複材產生NTC現象，而添加最適量為1.0 phr。然而添加塑化劑時，塑化劑對複材並沒有正面的貢獻。一般而言，厚度為0.4 mm的EVA/CB 複材的PTC強度較厚度為1.0 mm 複材的PTC強度強度為大。對電處理而言，EVA以40W之電漿處理三分鐘，再與碳黑混煉，可提供複材較高的PTC強度，及較穩定的PTC行為。由實驗得知，如果用一次加工的方法製備複材，複材的NTC現象很明顯，然而NTC的現象我們可用二步驟加工的方法來消除它，另外，也可在交聯EVA/碳黑複材中加入未交聯的EVA來改善複材的NTC現象。

關鍵字

乙烯醋酸乙烯脂 ； 正溫度係數材料 ； 碳黑 ； 熱敏電阻 ； 高分子

並列摘要

In this study, the polyethylene vinyl acetate (EVA) was bended with carbon black (CB) to produce the low temperature response positive temperature coefficient (PTC) elements. The effect of kinds of CB, CB content, initiator content, plasticizer content, thickness of elements, plasma treatment, processing method, matrix on the PTC behavior of blends were studied. In this investigation, the Monarch 120, N660, Vulcan XC-72 and Raven 430 ultra was compounded with EVA 633.to product PTC element. However, the CB (N660) / EVA possessed well R-T behavior. In this study, it was also found 40wt% of CB was blended with EVA633 could offer well R-T behavior. The initiator was added into EVA to produce crosslinked EVA and then blended with CB to form PTC element without NTC behavior. The optimum adding amount of initiator (BPO) was 1phr. However, the PTC behavior cannot be affected by adding plasticizer (ZnSt). For EVA/CB blends, the PTC intensity of blend with 0.4mm thickness was higher than those of 1.0mm thickness generally. For plasma treatment, the EVA was treated by plasma with 40w for 3min and the blended with CB could effor high PTC intensity and stable PTC behavior of composites. The NTC behavior of composites was very clear as the blends were prepared by on step processing method. This NTC phenomenon could be eliminate by using two steps processing method to prepare the composites. On the other hand, the NTC behavior of crosslinked EVA/CB composites could be eliminated by adding uncrosslinking EVA.

並列關鍵字

EVA ； PTC ； CB ； thermistor ； polymer

參考文獻

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