聚烯類高溫正溫度係數複合材料之製備與研究

The manufacture and investigation of polyolefin high temperature positive temperature coefficient composites

蕭景瑋(Jing-Wei Hsiao)

指導教授 ： 黃繼遠

大同大學/工程學院/材料工程學系所/碩士(2007年)

摘要

本研究將碳黑添加至聚丙烯基材，以製備成高分子基正溫度係數(PPTC)元件。並探討碳黑含量、電漿處理、交聯劑含量、60Coγ-ray輻射劑量對複合材料元件之正溫度係數（Positive Temperature Coefficient, PTC）強度的影響。並進行各種電性性質、物理性質和機械性質的測試。聚烯類高分子材料先經電漿前處理再與不同含量之導電性碳黑及交聯劑(DCP)掺混，再輔以不同劑量之γ-ray照射。因添加交聯劑與γ-ray照射有助於增加元件之PTC的強度。由實驗結果發現，當PP/CB組成經不同電漿處理瓦數與時間，發現在低電漿處理瓦數與添加DCP (0.75-1.00phr)下，即可得到明顯的PTC，使其複合材料之PTC強度即可達到106~107Ω；但是卻無法改善其NTC現象。另外，也發現γ-ray照射對於NTC現象消除亦無明顯幫助。因此我們在混合物中再加入第二種高分子基材。當加入HDPE時，NTC現象明顯改善許多，但是R-T曲線上升過早。所以我們使用熔點與聚丙烯接近的耐隆。當加入耐隆6後，NTC現象幾乎完全消失，但隨之的卻是其黏著性大幅下降，使得銅箔不易附著。最後我們使用耐隆12，實驗結果發現，耐隆12可消除聚丙烯/碳黑的NTC現象。且加入交聯劑後有不錯的PTC強度，而在黏性上，耐隆12則明顯優於耐隆6。因此我們發現聚丙烯/耐隆12/碳黑此複合材料具有良好的PTC強度，且達到PTC原件低阻抗之特性。

關鍵字

正溫度係數 ； 耐隆 ； 聚乙烯 ； 電漿處理 ； 交聯劑 ； 聚丙烯 ； 負溫度係數

並列摘要

In this study, the carbon black was added into polypropylene (PP) to produce polymeric positive temperature coefficient (PPTC) component. The effect of carbon black content, plasma treatment of PP, cross-linking agent concentration and γ-ray irradiation doses on the PTC intensity of component were investigated. And then, various kind properties of composites, such as electricity, physical, mechanical properties were tested. The PP was pretreated by plasma and then blended with different content of carbon black, and equal ratio of dicumyl peroxide (DCP). After compound, the composites were irradiated by different doses of 60Co γ-ray. On the other hand, adding of dicumyl peroxide (DCP) and irradiating by 60Co γ-ray were increased the PTC intensity of composites. In the research, as PP was treated by low power of plasma doses and 0.75-1.00phr of DCP contents, the PP/CB composites possessed 6~7 order of PTC intensity. But, they would not eliminate the NTC effect. And, we would observe that irradiated by 60Co γ-ray could not improve the NTC effect, too. So we would add the second polymer in composites. First, we would add HDPE in PP/CB. And the NTC effect was improved. But, the R-T curves were raised to advance the date. Therefore, we would choice the Nylon which the melting point was close to PP. After adding Nylon6, the NTC effect was eliminated. But the viscosity was decreased, and would make the adhesion of thin copper reducing hardly. Final, we would use the Nylon12. In the research, the NTC effect would be eliminated by adding Nylon12 in PP/CB composite. And it has the good intensity of PTC with adding cross-linking agent. And the viscosity of Nylon12 was better than Nylon6. Therefore, we would observe that the composites of PP/Nylon12/CB have good PTC behavior and low-impedance.

並列關鍵字

Nylon ； HDPE ； plasma treated ； cross-linking agent ； polypropylene ； PTC ； NTC

參考文獻

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37. L. Y. Huang, H. C. Tai, Master Thesis Department of Chemical Engineering Natural Taipei University, “The Influence of Nano-additives and 60Co Irradiation on the Electrical Property of Polymer/CB Composites”, June (2004).