Silica Nanoparticle-Mediated Solution-Phase Separation to Highly Porous Polylactide Membranes

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• 作者：Qingxian Liu ; Peng Zhang ; Bing Na ; Ruihua Lv ; Renping Tian
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：November 6, 2014
• 年：2014
• 卷：118
• 期：44
• 页码：25620-25625
• 全文大小：391K
• ISSN：1932-7455

文摘

Immersion precipitation of polylactide (PLA)/chloroform solutions in methanol yields membranes with lack of pore interconnectivity. In contrast, incorporation of silica nanoparticles (NPs) in the solutions promotes pore interconnectivity throughout the membranes. The selective association of silica NPs with chloroform upon phase separation significantly prevents the contraction caused by the formation of the PLA matrix, thus responsible for pore interconnectivity. Besides, pore size can be tailored by the PLA concentration in the solutions and the polarity of silica NPs. This study demonstrates that silica NPs can mediate solution-phase separation during immersion precipitation, which provides a facile route to achieve highly porous membranes.