本研究以熱處理與添加多壁奈米碳管兩種方法來提升高密度聚乙烯(High-density polyethylene, HDPE)和聚乙烯(Polyethylene)的散熱性能。藉由熱處理提升HDPE結晶度(Crystallinity)來增進熱傳性，稱為本質性的改善。添加多壁奈米碳管於聚乙烯製成複合材料並進行熱處理，進而觀察摻雜濃度與熱處理對聚合物散熱性能的影響。兩種方式皆藉由改變聲子平均自由路徑，以改善材料散熱性能。
由 DSC&TGA 的數據可得高密度聚乙烯結晶速率與溫度關係圖，推論影響結晶度的兩個關鍵參數為「冷卻速率」和「持溫時間」，藉此可進一步觀察高分子結晶度對熱擴散係數的影響。實驗結果顯示在相同熱處理溫度與時間(120°C,1hr)，冷卻速率愈快，對熱擴散係數下降的幅度愈大，在冷卻速率快至24°C/s下降可達19.4%，由此可知冷卻速率的快慢可以有效影響結晶性。當溫度固定時(結晶溫度:110°C,爐冷卻)，持溫時間愈久可提升熱擴散係數的幅度越大，最大者達約19% (24 h)。持溫32 和 48 h，則因為發生降解現象，故提升幅度較小。
在聚乙烯中添加多壁奈米碳管，實驗結果顯示添加量愈多，愈有助於散熱，在添加5 w.t%的多壁奈米碳管可提升熱擴散係數達 27%。對奈米碳管與高分子複合材料進一步作熱處理可提升碳管分散性，而分散性提高反而造成聲子傳遞熱時的異質介面增加，降低熱擴散係數約10%。

Phonon mean free path and thermal diffusivity of high-density polyethylene (HDPE) are significantly improved by heat treatment. DSC and TGA data reveal that improved thermal diffusivity is because of increased crystallinity and crystallization kinetic is controlled by cooling rate and duration of heat treatment; both affect thermal diffusivity by 19%. Improvement become insignificant as heat treatment proceeds over 24 h, attributable to polymer degradation. Addition of multi-walled carbon nanotubes (MWCNTs) into PE produces nanocomposites with thermal diffusivity promoted by 27% at filling fraction of 5w.t%. Application of heat treatment to MWCNTs-PE composites however reduces thermal diffusivity to a value slightly greater than pure PE and underling mechanism involves tube redispersion created interfaces where heat resistance forms.

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