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OALib Journal期刊
ISSN: 2333-9721
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采用聚醚酯制备多孔支架的条件控制
Abstract:
？采用热致相分离(tips)结合冷冻干燥技术制备了聚醚酯(聚对苯二甲酸丁二醇酯-co-聚对苯二甲酸环己烷二甲醇酯-b-聚乙二醇)(ptcg)多孔支架,研究了聚合物质量浓度、粗化温度和溶剂组成等相分离参数对多孔支架形貌结构的影响.结果表明,制备出的多孔支架孔间相互贯通,支架表面(与空气接触面)的孔径大于底面(与玻璃接触面)的孔径;随着聚合物质量浓度的增大,支架的孔径和孔隙率减小.由于分相过程中热力学推动力增大和相区融合阻力增加的相互作用,孔径随着粗化温度的降低呈现先升后降的趋势,并在0℃时出现最大值.在do中加入不良溶剂h2o,溶液分相温度的升高导致多孔支架孔径的增大.通过控制相分离参数可以制备不同形貌结构的ptcg多孔支架.
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