高密度聚乙烯/導熱粉體複合材料熱及機械性質之研究

A Study on the Thermal and Mechanical Properties of HDPE Composites with Thermal Conductivity Powders

陳正憲(Jeng-shain Chen)

指導教授 ： 鄧道興

國立臺北科技大學/工程學院/有機高分子研究所/碩士(2009年)

摘要

本研究係以物理混煉法將高密度聚乙烯（High-Density Polyethylene，HDPE）為基材，而以氮化鋁（Aluminum Nitride, AlN, D50=40μm）為主填充材，副填充材則為更小粒徑的氮化鋁（D50=20μm, 8μm, 1μm）及氧化鋁（Aluminum Oxide, Al2O3, D50=1μm），在固定粉體添加量（75 wt%）下，改變其比例，並製成複合材料。本文先將高密度聚乙烯、滑劑和導熱粉體三者經滾輪機混合均勻後，將此HDPE/導熱粉體逐步定量餵入雙螺桿混煉機，藉由高溫與雙螺桿之剪切力，使其再次均勻共混，製成HDPE/導熱粉體母粒，最後以射出成形機製得高密度聚乙烯/導熱粉體複合材料。後續運用熱重量分析儀(TGA)探討高密度聚乙烯/導熱粉體複合材料之熱性質；並以同心圓高電阻儀器探討此複合材料材之電性質，及由迅速導熱測定儀及熱電偶式溫差測試系統測定高密度聚乙烯/導熱粉體複材之導熱性能，最後以掃描式電子顯微鏡(SEM)來觀測導熱粉體在高密度聚乙烯/導熱粉體複合材料中之分散狀態，且該複合材料之基本機械性質也在本文中予以探討。

關鍵字

高密度聚乙烯 ； 氮化鋁 ； 氧化鋁 ； 熱傳導性 ； TGA ； QTC

並列摘要

In this study, composites were made by the high-density polyethylene (HDPE) as matrix to blend with the main filler, aluminum nitride, AlN(D50=40μm) as well as with the even smaller, secondary filler, AlN(D50=20μm, 8μm, 1μm) and Al2O3 (D50=1μm) of different filler raitos. Firstly, HDPE, lubricant and thermal conductivity powders were evenly mixed together with ball miller, then the proper HDPE/thermal conductivity powders composites were fabricated. The thermal property of HDPE/ thermal conductivity powders composites were investigated by Thermogravimetric Analyzer (TGA) and its electrical properties were examined by surface resistivity analyzer. The thermal conductivity were also evaluated by quick thermal conductivity meter and thermocoupling temperature testing system, the dispersibility of filler in HDPE/thermal conductivity powders composites was obtained by studying the Scanning Electron Microscopy (SEM). The related basic mechanical properties of composites were also investigated.

並列關鍵字

High-Density Polyethylene ； Aluminum Nitride ； Aluminum Oxide ； Thermal Conductivity ； TGA ； QTC

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