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聚乳酸酯/硒化鎘量子點混成材料之製備與特性探討 = Preparatio...

國立高雄大學化學工程及材料工程學系碩士班

聚乳酸酯/硒化鎘量子點混成材料之製備與特性探討 = Preparation and Characterization of the Poly(lactic acid)/Cadmium Selenide Qunatum Dots Hybrid Materials

紀錄類型:	書目-語言資料,印刷品 : 單行本
並列題名:	Preparation and Characterization of the Poly(lactic acid)/Cadmium Selenide Qunatum Dots Hybrid Materials
作者:	楊秉勳,
其他團體作者:	國立高雄大學
出版地:	[高雄市]
出版者:	撰者;
出版年:	2014[民103]
面頁冊數:	152葉部分彩圖，表 : 30公分;
標題:	聚乳酸酯
標題:	PLA
電子資源:	https://hdl.handle.net/11296/wgjb93
附註:	108年10月31日公開
附註:	參考書目：葉128-136
摘要註:	本研究主要利用微分掃描熱卡計(DSC)、偏光顯微鏡(POM)、螢光光譜儀(FL)來探討聚乳酸酯/硒化鎘量子點混成材料之光學性質、熱行為與結晶影響。研究中以水熱法製備巰基乙酸包覆硒化鎘量子點，可藉由改變反應溫度合成出不同粒徑之硒化鎘，隨著溫度增加，粒徑變大，放光波長往紅位移偏移，證實量子侷限效應；再以二氧化矽與幾丁聚醣包覆硒化鎘後，螢光強度明顯提升，表示電子電洞對複合機率增加；並利用交聯劑製備出多壁奈米碳管/硒化鎘複合材料，發現硒化鎘鍵結在多壁奈米碳管上後，放光波長有藍位移現象。以硒化鎘摻入聚乳酸酯後製備出聚乳酸酯/硒化鎘混成材料，此混成材料之放光波長皆無明顯位移但放光波峰有寬化現象。經由POM 分析發現到在摻入2 wt%硒化鎘時，於PLA/CdSe (4.4 nm)與PLA/CdSe (6.6 nm)兩系統中，PLA 之球晶成長速率有明顯上升之趨勢，顯示硒化鎘扮演成核劑之角色，但摻入超過13 wt%後，反而速率有減緩之現象，是因過多的硒化鎘分佈，阻礙PLA 結晶成長；DSC 之結果顯示，隨著硒化鎘含量增加至45 wt%時，兩系統之k 值有先增後減之趨勢，表示硒化鎘確實改善PLA 結晶性，但需選擇較適合的摻混比例。此外，在摻入13 wt%硒化鎘時，PLA/CdSe (4.4 nm)系統之結晶成長速率低於PLA/CdSe (6.6 nm)系統，表示小粒徑之硒化鎘抑制PLA 結晶成長較為明顯。 Characterization of the poly(lactic acid)/cadmium selenide quantum dots hybrid materials was investigated by differential scanning calorimetry (DSC), polarized optical microscopy (POM) and fluorescence spectroscopy (FL). In this research, the thioglycolic acid-capped CdSe quantum dots were prepared by the hydrothermal method. The particle sizes of cadmium selenide quantum dots were related to the reaction temperature and the emission peak. With the increase of the temperature, corresponding to an essential increase of CdSe QDs particle size and the emission peak tends to red-shift. The quantum confinement effect was proved. As as-prepared CdSe QDs were capped with SiO2 and Chitosan, the FL intensity increases significantly. The result showed that the electron-hole recombination probability increases in CdSe QDs. Furthermore, the MWCNT/CdSe nanocomposites were synthesized by using of cross-linking agent, and the emission peak tends to blue-shift when CdSe was covalently attached to the MWCNT surface. The PLA/CdSe hybrid materials were synthesized by blending CdSe QDs with PLA, and the emission peak of the PLA/CdSe hybrid materials didn't shift but became broaden when adding CdSe QDs to PLA. In the PLA/CdSe hybrid materials, the spherulite growth rate of PLA was found to be improved by adding 2 wt% of CdSe, indicating that CdSe acted as a nucleating agent. However, excessive CdSe QDs (>13 wt%) will decrease crystallization rate of PLA in the hybrid materials. DSC results showed that the K values of the PLA/CdSe hybrid materials are increased at first, then decreased with increasing CdSe content to 45 wt%. It shows that PLA/CdSe hybrid materials would improve the crystallinity of PLA but a more proper proportions must be adopted. In addition, by adding 13 wt% of CdSe, the crystallization growth rate of PLA in the PLA/CdSe (4.4 nm) system is lower than that in the PLA/CdSe (6.6 nm) system. It shows that the small particle size of CdSe would inhibit the crystal growth of PLA significantly.

聚乳酸酯/硒化鎘量子點混成材料之製備與特性探討 = Preparation and Characterization of the Poly(lactic acid)/Cadmium Selenide Qunatum Dots Hybrid Materials
楊, 秉勳

聚乳酸酯/硒化鎘量子點混成材料之製備與特性探討 = Preparation and Characterization of the Poly(lactic acid)/Cadmium Selenide Qunatum Dots Hybrid Materials / 楊秉勳撰 - [高雄市] : 撰者, 2014[民103]. - 152葉 ; 部分彩圖，表 ; 30公分.
108年10月31日公開參考書目：葉128-136.
聚乳酸酯PLA

聚乳酸酯/硒化鎘量子點混成材料之製備與特性探討 = Preparation and Characterization of the Poly(lactic acid)/Cadmium Selenide Qunatum Dots Hybrid Materials
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