如聚乙二醇peg.ppt

指導教授：王振乾 學 生：蕭詠方 Outline Abstract Introduction Experimental Results and discussion Conclusion Abstract 利用溶膠-凝膠法製備具可塑性的聚乳酸(PLA)-二氧化矽(silica)奈米複合材料. IR XRD TGA Tensile testing SEM 結果顯示 聚乳酸(PLA)的C-O-C基團震動峰受二氧化矽(silica)網狀結構限制而減弱. 聚乳酸(PLA)的結晶度受二氧化矽(silica)網狀結構限制而下降. 存在少量的二氧化矽(silica)可提升材料的拉伸強度. 添加二氧化矽(silica)可改善材料的熱穩定性. Introduction PLA具生物可分解性、生物相容性等優點, 且具良好的加工性. 但其為硬質易脆材料、耐撓曲性差, 在應用上受到限制. 添加生物可分解的可塑劑, 如聚乙二醇(PEG), 可增進PLA的韌性或撓曲性, 幫助延伸、耐衝擊. 近年來, 製備PLA奈米複合材料以添加蒙脫土、雲母等較為常見, 研究顯示, 以PLA/PEG為基材, 添加有機改質蒙脫土可改善材料的性質. 此研究目的主要以PLA/PEG為基材, 利用溶膠-凝膠法製備具可塑性的PLA-silica奈米複合材料. 探討奈米複合材料的合成過程、結構、熱與機械性質. Experimental Materials Poly(L-lactic acid) (PLA) (Mn=70,000) Poly(ethylene glycol)400 (PEG, Mw=400) Tetraethyloxysilane (TEOS) Glycidoxypropyltrimethoxysilane (GPTMS) Hydrochloric acid (HCl) tetrahydrofuran (THF) Experimental Preparation of PLA/PEG/silica nanocomposites PLA and PEG 400 was melt blending at 8:2 Results and discussion Results and discussion Results and discussion Results and discussion Results and discussion Conclusion Plasticized poly(L-lactide)-silica nanocomposite materialshave been successfully fabricated by sol–gel method. IR and XRD measurements show that both the vibration of C–O–C group and the crystallization of PLA are confined by silica network. The presence of even a small amount of silica greatly improved the tensile strength of the samples. The thermal stability of samples is improved with silica loading. * * 使用矽烷化合物, 在酸或鹼的催化下, 連續進行水解及縮合反應. HCL/TEOS/GPTMS 添加不同比例的矽烷化合物(0%. 3%. 5%.8%12%) PLA/PEG400 solution 完全混合 homogeneous solution Homogeneous solution EtOH Deionized water HCl 室溫 2hr TEOS、GPTMS發生水解且透明具黏性的溶膠形成 於THF中加熱攪拌至完全溶解 THF 溶膠 Covered with perforated polyethylene film 靜置4天 以聚乙烯為載體的凝膠材料形成. 凝膠 vacuum dried 60℃, 24hr remove the residue water and THF. Sample 模壓成型 150℃,15MPa thickness of about 0.5mm PLA/PEG/0%silica PLA/PEG/3%silica PLA/PEG/5%silica PLA/PEG/8%silica PLA/PEG/12%silica TEOS GPTMS Silica networ