半結晶性高分子PVDF-HFP在超臨界二氧化碳中發泡之研究

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Title:	半結晶性高分子PVDF-HFP在超臨界二氧化碳中發泡之研究
Authors:	謝筱琪
Contributors:	化學工程與材料工程學系
Keywords:	超臨界二氧化碳 Supercritical carbon dioxide
Date:	2012
Issue Date:	2012-10-11 09:20:28 (UTC+8)
Abstract:	本研究致力於半結晶形高分子聚偏二氟乙烯-六氟丙烯(PVDF-HFP)在超臨界二氧化碳中發泡的研究，本研究主要是觀察各種不同操作條件對孔洞形貌及性質的影響。首先本研究，藉由改變發泡溫度(120℃~130℃)、發泡壓力(15MPa~35MPa)及飽和時間(15min~60min)等操作條件，去觀察各發泡條件對製備PVDF-HFP發泡材的影響。接著利用掃描式電子顯微鏡(SEM)去觀察孔洞形貌，利用熱示差掃描卡量計(DSC)去量測熔點及焓值。最後再利用公式去計算孔洞的實際大小、密度以及結晶度。在孔洞形貌方面，本實驗結果發現，當發泡溫度提高時，孔洞的大小會變大但密度會變小，當發泡壓力提高時孔洞大小會變小但密度會變大。最後本研究發現，飽和時間對孔洞形貌的影響最小。在物理性質方面，本研究發現，PVDF-HFP發泡材的熔點會隨著發泡壓力及發泡溫度的提高而升高，但結晶度會隨之提高而降低。最後，本研究發現飽和時間只有在某些特定的操作條件下才會對其物理性質造成較大的影響。 This work is aimed at studying the foaming behavior of poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HHP) with supercritical carbon dioxide (scCO2). We investigated the foam’s cell structure and property in different operation condition. In this study，first we change the operation conditions just like foaming pressure (15MPa~35MPa)、foaming temperature (120℃~130℃) and saturation time (15min~60min). Then we use scanning electron microscope (SEM) to observe the cell structure, and use DSC (Differential Scanning Calorimetry) to measurement the melting point and enthalpy of the polymer foam. Finally we use the formula to calculate the cell diameter 、cell density and crystallinity of polymer. In foam’s cell structure, we find that, the cell size will increase with the increase temperature, but the cell density will decrease. The cell size will decrease with the increase pressure, but the cell density will increase. Finally, we find that, the saturation time with minimal impact on the cell structure. However, in the physical properties, we find that, PVDF-HFP foam’s melting temperature will increase with increase foaming pressure and foaming temperature, but crystallinity will decrease. Finally we find that, the saturation time will cause greater effect in physical properties only in some operating conditions.
Appears in Collections:	[Department of Chemical & Materials Engineering] thesis

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