聚苯乙烯-聚乙烯-聚丁烯-聚苯乙烯/聚丙烯高分子在超臨界二氧化碳發泡之研究

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Title:	聚苯乙烯-聚乙烯-聚丁烯-聚苯乙烯/聚丙烯高分子在超臨界二氧化碳發泡之研究 Study of foaming of polymer SEBS/PP with supercritical carbon dioxide
Authors:	吳建群
Contributors:	化學工程與材料工程學系奈米材料碩士班
Keywords:	熱塑性彈性體聚苯乙烯-聚乙烯-聚丁烯-聚苯乙烯超臨界二氧化碳 Thermoplastic elastomer SEBS Supercritical carbon dioxide
Date:	2016-06
Issue Date:	2016-08-10 10:48:57 (UTC+8)
Abstract:	本論文主要目的為研究聚苯乙烯-聚乙烯-聚丁烯-聚苯乙烯（SEBS）混合聚丙烯（PP）之高分子材料在超臨界二氧化碳（scCO2）中的發泡現象，探討改變各種操作條件下，物理性質與孔洞結構的變化，並利用實驗分析法原理分析泡孔孔徑數據。首先改變發泡壓力（1050psi、1200psi、1350psi）、發泡的溫度（40℃、50℃、60℃）及洩壓快慢，接著研究增加飽和時間（15min、22.5min、30min）對實驗樣品的影響，並且使用掃描式電子顯微鏡（SEM）觀察實驗樣品在不同條件下泡孔的形貌。透過熱重量分析儀（TGA）得知熱裂解溫度以便進行示差掃描熱量分析儀（DSC）了解其物理性質，如熔點。實驗數據進行變異數以及二階模式之分析，探討各條件因子與條件因子兩者之間的交互作用並對泡孔孔徑之影響。研究結果發現當發泡溫度、發泡壓力、飽和時間都上升但洩壓變慢，泡孔平均大小（Davg）也會增加，但泡孔密度（Nf）卻減少；變異數分析結果顯示所有操作條件皆實驗有影響性。最後研究發現，若要最小的泡孔孔徑，發泡溫度40℃、發泡壓力1050psi、飽和時間15分鐘、快速洩壓為最適當的條件。 The goal of this research was to study the foaming behavior of Styrene-ethylene-butylene-styrene block copolymer（SEBS）blended with polypropylene（PP）using Supercritical carbon dioxide(scCO2), to explore the changes in the structure of foam cells and the physical character under the various operating conditions, and to use the Design of Experiments to analyze the average cell diameter. First of all, we changed the sample's foaming temperature at 40℃,50℃,and 60℃; the foaming pressure at 1050psi,1200psi, and 1350psi; and the time of depressurization, studied the effect of saturation at a given time, 15min、22.5min and 30min, and used the scanning electron microscope (SEM) to observe the cell morphology at various operating conditions. To know the sample's physical character, which is the melting point, we had to use Thermal Differential Scanning Calorimetry (DSC) to analyze the pyrolysis temperture that is analyzed from Thermo Gravimetry Analyzer (TGA). Finally, we used the experimental data to do analysis of variance (ANOVA) and second-order model to know the effect between the interaction of each experimental factors and the cell diameter. The results revealed that when the foaming temperature, the foaming pressure, and the saturation time all increase, but the depressurization rate is low, the cell average size (Davg) becomes larger but the cell density (Nf) becomes lower. Analysis of variance (ANOVA) indicate that all operating conditions are influences. Finally, the foaming temperatur at 40℃, the foaming pressure at 1050 psi, and the saturation time at 15 minute can get the smallest foam cells.
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