| 深度冷冻干燥对聚(L-乳酸)结晶性能的影响 |
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| 引用本文： | 郝红,刘荣杰,张粉艳,赵涛,管晓玉.深度冷冻干燥对聚(L-乳酸)结晶性能的影响[J].离子交换与吸附,2009,25(4). |
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| 作者姓名： | 郝红 刘荣杰 张粉艳 赵涛 管晓玉 |
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| 作者单位： | 西北大学化工学院,西安,710069 |
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| 基金项目： | 陕西省13115科技创新工程重大科技专项项目，陕西省教育厅产业化培育项目资助 |
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| 摘 要： | 采用广角X射线衍射(XRD)和差示扫描量热(DSC)方法研究了深度冷冻干燥对PLLA结晶性能的影响.深度冷冻干燥方法可以改善PLLA的结晶性能.实验结果表明,0.1%、1%、5%和10%PLLA的对二甲苯溶液经过深度冷冻干燥得到PLLA的结晶速度系数(CRC)分别为0.935、0.877、0.826和0.863,高于从0.1%对二甲苯溶液中结晶得到的PLLA的CRC(为0.643).
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| 关 键 词： | 聚(L-乳酸) 结晶性能 深度冷冻干燥 解缠结 |
EFFECT OF FREEZE-DRYING FROM PLLA SOLUTIONS WITH VARYING CONCENTRATIONS ON CRYSTALLIZATION OF POLY(L-LACTIDE) |
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| HAO Hong,LIU Rongjie,ZHANG Fenyan,ZHAO Tao,GUAN Xiaoyu.EFFECT OF FREEZE-DRYING FROM PLLA SOLUTIONS WITH VARYING CONCENTRATIONS ON CRYSTALLIZATION OF POLY(L-LACTIDE)[J].Ion Exchange and Adsorption,2009,25(4). |
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| Authors: | HAO Hong LIU Rongjie ZHANG Fenyan ZHAO Tao GUAN Xiaoyu |
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| Institution: | HAO Hong LIU Rongjie ZHANG Fenyan ZHAO Tao GUAN Xiaoyu College of Chemical Engineering,Northwest University,Xi'an 710069,China |
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| Abstract: | The macromolecular chain conformation in solution changes with the solvent and temperature,which will affect the formation of crystalline structure in the subsequent crystallization process. Poly(L-lactide) (PLLA) was freeze-dried from p-xylene solutions with varying concentrations. The recovered samples were characterized by differential scanning calorimetric and X-ray diffraction. It is found that the sample exhibits the higher non-isothermal crystallization temperature and faster crystallization rate. Th... |
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