生物可分解性聚己內酯/澱粉之研究

The Investigation of Biodegradable Polycaprolactone(PCL)/Starch Blends

吳靜宜(Jing-Yi Wu)

指導教授 ： 黃繼遠

大同大學/工程學院/材料工程學系所/碩士(2006年)

摘要

澱粉經由不同濃度(6.21*10-6 ,3.11*10-5 ,6.21*10-5 , 0.1,0.5, 1.0M)的酸(馬來酸酐、草酸、琥珀酸)進行酸解。當澱粉經由草酸溶液 M酸解過後，其融熔流動指數可由2.73(g/min)提高至5.62(g/min)。草酸溶液濃度提高至0.5M時，融熔流動指數可達到66.90(g/min)。O4、O5、O6系列的材料的伸長率比原本PCL/ST提高2倍。由SEM圖得知，當以高濃度(0.1、0.5、1.0M)的草酸溶液或是馬來酸酐溶液酸解澱粉時，可改善原本PCL/ST的相分離情形。另由X-ray 圖得知，經由酸解過後的澱粉其結晶度下降。在本研究中，我們可藉由測試草酸溶液中的未反應草酸所含的結晶水來判定最適量酸解澱粉的草酸溶液濃度。本研究中，澱粉以0.1 M的草酸酸解，再與PCL混煉後所製備的混煉物(O4)擁有較佳的應力應變行為，亦沒有相分離的情形現象，O4、O5、O6掺合物具有較佳的堆肥分解能力。

關鍵字

澱粉 ； 生物可分解性 ； 聚己內酯

並列摘要

The starch was degraded by various kinds of acid (such as maleic acid(MA), oxalic acid(OA) and succinic acid(SA)) with various concentrations (6.21*10-6 ,3.11*10-5 ,6.21*10-5 , 0.1, 0.5, 1.0M ). The melt flow index (MFI) of PCL/ST blend could be increased from 2.73g/10min to 5.62g/10min as the starch was degraded by M [ ] oxalic acid solution. Furthermore, the MFI of blends could be up to 66.90(g/min) as the starch was degraded by 0.5M oxalic acid solution. The elongation of O4, O5, O6 blends could be increased about 2.0 times higher than that of PCL/ST blend. SEM graphs show that the phase separation phenomenon between PCL and starch could be improved by using high concentration (0.1, 0.5, 1.0M) oxalic acid or maleic anhydride solution to degrade the starch. The X-ray scans show that the crystallinity of starch would be destroyed by acid degradation. In this investigation, we can detect the unreacted oxalic acid hydrate which was contained in modified starch to judge the optimum concentration of acid hydrolysis solution. In this study, the starch was degraded by 0.1M oxalic acid dihydrate solution and then blended with PCL (O4 blend). The O4 blend possessed well stress-strain behavior and without phase separation phenomenon. The weight loss of compost of O4, O5 and O6 blends also show well degradation ability.

並列關鍵字

starch ； biodegradable ； PCL

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