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智能材料通常指的是那些可以积极响应外部环境刺激或者可以对环境变化很敏感的材料。作为1种温敏材料,聚(N-异丙基丙烯酰胺)可以在29～38℃的最低临界转换温度(LCST)范围内快速地发生可逆的结构转变,这种可逆的结构改变使聚合物从亲水变成疏水,可以广泛应用在功能性纺织业、药物的控制释放及特种纤维等领域。静电纺丝是1种简单,方便的方法,可以用来制备直径只有几十纳米到几微米的纤维材料。文章研究了静电纺丝技术来制备纳米PNIPAAm纤维的方法。研究表明:通过静电纺丝的方法,可以成功制备直径在200 nm以下的PNIPAAm纤维;同时发现即使在纤维状态下,它在LCST温度下的可逆亲疏水转变依然可以很好地展现出来。
Smart materials generally refer to materials that can respond positively to external stimuli or that can be sensitive to environmental changes. As a kind of temperature-sensitive material, poly (N-isopropylacrylamide) can rapidly undergo reversible structural transformation in the range of the lowest critical transition temperature (LCST) of 29-38 ° C. This reversible structural change makes the polymer From hydrophilic to hydrophobic, can be widely used in functional textiles, controlled release of drugs and specialty fibers and other fields. Electrospinning is a simple and convenient method that can be used to make fiber materials that are only a few tens of nanometers to a few microns in diameter. The article studied electrospinning technology to prepare nano-PNIPAAm fiber method. The results show that PNIPAAm fibers with diameters below 200 nm can be successfully prepared by electrospinning method. At the same time, it is found that the reversible hydrophobic and hydrophobic transition at LCST can be well demonstrated even in the fiber state.