Porous polymer films cast from latex-glucose dispersions
Porous polymer films cast from latex-glucose dispersions
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DOI：
10.1016/j.colsurfa.2009.08.003
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发表时间：
2009-10-05
影响因子：
5.2
通讯作者：
Fogden, Andrew
中科院分区：
文献类型：
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作者：
Fogden, Andrew
玻璃状聚合物的大孔膜由溶解有葡萄糖的稳定的乳胶水分散体制备，涂覆在载体基材上并在高温下干燥成混合膜，然后浸入水中以滤出葡萄糖和任何可再分散的乳胶。必须调整干燥温度和时间，以促进乳胶颗粒通过葡萄糖排出而局部聚结，同时避免两相完全分层。阐明了局部成膜乳胶和葡萄糖网络的相互渗透可以在动力学上锁定以最大化膜产率和孔隙率的条件，作为葡萄糖/乳胶含量的函数。通过重量分析、紫外-可见光谱和扫描电子显微镜分析多孔膜。它们具有在膜厚度方向分级的无序连接的亚微米孔网络，由于毛细管作用和对流向上传输移动葡萄糖，从上表面到下表面的可及性降低。 (C) 2009 Elsevier B.V. 保留所有权利。
Macroporous films of glassy polymer are prepared from stable aqueous dispersions of latex with dissolved glucose, coated on a carrier substrate and dried at elevated temperature to a hybrid film, followed by water immersion to leach out the glucose and any redispersible latex. Temperature and time of drying must be tailored to facilitate local coalescence of latex particles by glucose expulsion while avoiding complete demixing of the two phases. The conditions for which mutual interpenetration of locally film-formed latex and glucose networks can be kinetically locked-in to maximize film yield and porosity are elucidated as a function of glucose/latex content. The porous films were analyzed gravimetrically and by UV-vis spectroscopy and scanning electron microscopy. They possess a disordered connected network of sub-micron pores graded in the film thickness direction, with accessibility decreasing from upper to lower surface due to upward transport of mobile glucose by capillarity and convection. (C) 2009 Elsevier B. V. All rights reserved.