聚對苯二甲酸乙二酯/竹炭複合材料之熱物性、燃燒性質與流變之研究

Effects of introducing bamboo charcoal on thermo-physical, rheological properties and combustion behavior of PET.

張哲鈴(Che-Ling Chang)

指導教授 ： 郭文正 ； 蘇淵源

國立臺北科技大學/工程學院/化學工程研究所/碩士(2009年)

摘要

本研究將研磨後的竹炭液以不同比例添加入聚對苯二甲酸乙二酯（poly(ethylene terephthalate)，PET）後製成粉末或塊材，討論不同比例竹炭添加於PET中對材料物性、熱性質及燃燒性質的影響，首先物性分析測量其電阻係數及熱傳導係數，熱性質分析使用TGA及DSC，以圓錐量熱儀探討其燃燒性質，再以旋轉式平行板流變儀進行PET/BC複合材料熔融態之動態與穩態流變實驗，並分析探討複材微結構與流變性質之關聯性。
經由電阻測試得知添加竹炭能有效的降低電阻，添加竹炭15%以上可到達半導體炭等級；熱傳導測試結果得知添加竹炭比例越高所得到的熱傳導係數越高，竹炭的導熱性略高於PET；TGA測試中顯示添加竹炭可有效提升熱安定性。另外，利用圓錐量熱儀的燃燒測試來量測此PET/BC複合材料的熱釋放量與發煙量，其結果顯示添加竹炭有助於降低熱釋放量及發煙量，其中以添加3%竹炭為最佳比例；對於流變行為的探討，在動態頻率掃描實驗顯示，PET及PET-1為牛頓流體，其他比例則為非牛頓流體，添加竹炭10%以下的試片，其行為模式皆為liquid -like，超過10%則有明顯的solid行為，以加工抽絲而言，solid行為會使加工溫度提升、抽絲不易，綜合以上物性及熱性質分析，可判斷出添加3%竹炭為最佳比例。

關鍵字

竹炭 ； PET/竹炭複合材料 ； 熱性質 ； 流變性質 ； 燃燒性質

並列摘要

In this study , different proportion of PET powder was charged into bamboo charcoal slurry to prepare PET/Bamboo charcoal composites (PET-X；X=1,3,5,10, 15wt% of bamboo charcoal). Effect of bamboo charcoal addition level on volume resistance and thermal conductivity of PET-X were measured. Thermal properties of PET-X were analyzed by TGA and DSC. Cone calorimeter was employed to evaluate the combustion behavior of virgin PET and PET-X. The melt rheological properties of PET and PET-X were measured with a parallel-plate rheometer of rotational type. With these results the relationship between the microstructure of the bamboo charcoal and the rheological properties was discussed.
Volume resistance of PET composites showed a sharp decrease as the bamboo charcoal content increased. On the contrary, thermal conductivity of PET-X exhibited a slightly increasing tendency as the bamboo charcoal content increased. All of the PET-X specimens possessed good thermal insulation. The main thermal degradation temperature of PET-X were increased obviously by the addition of bamboo charcoal. Results from combustion test also indicated that incorporation of bamboo charcoal can effectively reduce the peak heat release rate and smoke production. PET-3 showed the best fire performance.
Data from rheological study indicated that PET and PET-1 show almost the same viscosity value and Newtonian fluid behavior over most of the frequency range examined. PET composites with 3 wt% BC and above exhibit Bingham body flow behavior. PET composites with bamboo charcoal content less than 10 wt% display liquid-like behavior, surpasses 10 wt% have obvious solid behavior. In the process of wiredrawing, solid behavior of matrice will make wiredrawing difficult and higher processing temperature is needed. In summary, PET composites with 3 wt% bamboo charcoal give the best performance on thermo-physical and combustion behavior.

並列關鍵字

Bamboo charcoal ； PET/Bamboo charcoal composites ； thermal propertiy ； rheological property

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