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首页> 外文期刊>RSC Advances >Honeycomb-like porous chitosan films prepared via phase transition of poly(N-isopropylacrylamide) during water evaporation under ambient conditions
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Honeycomb-like porous chitosan films prepared via phase transition of poly(N-isopropylacrylamide) during water evaporation under ambient conditions

机译：在环境条件下在水蒸发期间通过聚（N-异丙基丙烯酰胺）的相转变制备的蜂窝状多孔壳聚糖膜

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Honeycomb-like porous chitosan (CS) films are attractive tools for developing functional materials for filters, catalyses, adsorbents, biomaterials, etc. A simple method for fabricating honeycomb-like porous CS films without special reagents, facilities, and techniques would make them accessible. Here we introduce an easily available method for fabricating honeycomb-like CS films without a strong acid/base, toxic reagents, or special facilities/techniques. An aqueous solution containing CS and poly( N -isopropylacrylamide) (PNIPAm) was allowed to stand at 25 °C to evaporate water. After 3 days, CS–PNIPAm composite films with homogenously phase-separated PNIPAm particles were obtained. The PNIPAm particles were removed by immersion in methanol, and the resulting films dried under reduced pressure to become honeycomb-like porous CS films. The pore size could be varied in the range of 0.5–3.0 μm by altering the CS concentration and the molecular weight of CS where the pore size was reduced under conditions with stronger interaction between CS molecules. We reveal that the key to success with this system is the decrease of lower critical solution temperature (LCST) of PNIPAm with water evaporation. In addition, we confirmed the removed PNIPAm was recyclable in this system. Furthermore, we found this method was also applicable to alginate. The proposed facile method for fabricating honeycomb-like porous polymeric films could provide various functional porous materials.
机译：蜂窝状多孔壳聚糖（CS）薄膜是用于开发过滤器，催化剂，吸附剂，生物材料等功能材料的吸引力工具。一种简单的方法，用于制造没有特殊试剂，设施和技术的蜂窝状多孔Cs膜的制造方法将使它们能够实现。在这里，我们介绍一种易于制造蜂窝状Cs薄膜的方法，而没有强酸/碱，有毒试剂或特殊设施/技术。允许含有Cs和聚（N-丙基丙烯酰胺）（PNIPAM）的水溶液在25℃下蒸发水。 3天后，获得具有均匀相分离的泊地颗粒的Cs-PNIPAM复合膜。通过浸泡在甲醇中除去肺蛋白颗粒，并在减压下干燥所得薄膜以成为蜂窝状多孔Cs膜。通过改变Cs分子与CS分子之间较强相互作用的条件下，通过改变Cs浓度和Cs的分子量，孔径可以在0.5-3.0μm的范围内变化。我们揭示了与该系统成功的关键是肺部临界溶液温度（LCST）降低水蒸发。此外，我们确认已移除的肺蛋白在该系统中可回收。此外，我们发现该方法也适用于藻酸盐。所提出的用于制造蜂窝状多孔聚合物膜的容易方法可以提供各种功能多孔材料。

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