隨著電子元件不斷的朝向短小輕薄且高性能和速度發展,使得電子元件的產生的熱能愈來愈高,因此電子散熱問題變成電子產品首要克服的關鍵,也造就熱界面材料研究的蓬勃發展。符合製作界面材料所需要素非高分子莫屬,但高分子本身導熱性質並不高,需再添加高熱傳導性質的添加材去提升其特性。 本研究利用四種多壁奈米碳管、兩種膨脹石墨和石墨烯作為其強化材,並以兩種高分子(分別為純粹的與添加無機粒子的聚二甲基矽氧烷)為基材,使用簡單的物理攪拌法製備碳材料/PDMS高分子複合材料試片。本實驗利用Hot Disk量測其熱傳導性質,以X-射線繞射分析和拉曼做定性分析,利用場發式顯微鏡微觀碳材料/高分子複合材料表面形貌,使用熱重分析量測其熱穩定性,最後使用膨潤特性進行探討在加溫固化後試片特性,在高分子複合材料中添加碳材料除了尺寸長短會有影響外,其結構的特性對於複合材的熱傳導也占很大因素。膨脹石墨與高分子相容性高,在複合材具有良好的分散性,因此可大幅提升其熱傳導質。商業購買的石墨烯在未任何處理下,與實驗使用的高分子並無法相容,因此其熱傳特性不佳。
Carbon based materials have found enormous applicability in most areas of science and engineering because of their excellent electronic and thermal conductivity and mechanical properties. In this study, we prepared various carbon based materials/Polydimethylsiloxane (PDMS) composites with carbon based materials (such as carbon nanotube (CNT), expandable graphite(EG), and graphene) to achieve higher thermal conductivity. We used thermal conductivity meter (Hot disk), scanning electron microscope (SEM), thermogravimetric analysis (TGA), and nanoindenter to determine the thermal conductivity, morphology, dispersion of carbon based materials, and thermal stability of the carbon based materials/PDMS composites, respectively. We founded that the D/G ratio of CNT will make a great impact on the thermal conductivity of CNT/PDMS composites. We also revealed that EG was dispersed well in PDMS and enhanced the thermal conductivity of EG/PDMS composites.