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Facile and Green Preparation of Superfast Responsive Macroporous Polyacrylamide Hydrogels by Frontal Polymerization of Polymerizable Deep Eutectic Monomers
Industrial & Engineering Chemistry Research ( IF 4.2 ) Pub Date : 2020-01-14 , DOI: 10.1021/acs.iecr.9b05273
Yang Jiang 1, 2 , Shengfang Li 2, 3 , Yapeng Chen 1, 2 , Shilin Yan 4 , Min Tao 3 , Pin Wen 4
Affiliation  

Polymerizable deep eutectic monomers (DEMs) were prepared by mixing various molar ratios of acrylamide (AM) and choline chloride (ChCl). 1H NMR and Fourier transform infrared confirmed that there were strong hydrogen bonds between AM and ChCl in DEMs. The hydrogen bonds can effectively depress the crystallization of AM and ChCl. All DEMs can be used for sustainable thermal-induced frontal polymerization (FP) at 35 °C. It was found ChCl could accelerate the FP of DEMs. The front velocity (Vf) and the maximum front temperature (Tmax) of FP in DEM were much higher than those in dimethyl sulfoxide. The increase in the molar ratio of AM and ChCl and the amount of N,N′-methylenebisacrylamide (MBA) led to an increase in Vf and Tmax. When the polymerized DEM hydrogels were immersed in distilled water, water-soluble ChCl were washed out and the hydrogels were further freeze-dried. The macroporous polyacrylamide hydrogels with pores in an average diameter of about 150 μm were observed. They exhibited superfast reversible swelling and shrinkage in alternate water and acetone. The study implies a facile and green method to efficiently fabricate macroporous polyacrylamide hydrogels with superfast responsive properties via FP of DEMs in less than 6 min. The preparation method is also green, low-energy, and sustainable and possesses a good application prospect in the environmental and biomedical areas.

中文翻译:

通过可聚合的深共晶单体的正面聚合轻松快速地制备超快速响应的大孔聚丙烯酰胺水凝胶

通过混合各种摩尔比的丙烯酰胺(AM)和氯化胆碱(ChCl)来制备可聚合的深共晶单体(DEM)。1 H NMR和傅立叶变换红外光谱证实DEM中AM和ChCl之间存在强氢键。氢键可以有效地抑制AM和ChCl的结晶。所有DEM均可在35°C下用于可持续的热诱导额叶聚合(FP)。发现ChCl可以加速DEM的FP。DEM中FP的前沿速度(V f)和最高前沿温度(T max)远高于二甲基亚砜。AM与ChCl的摩尔比和NN含量的增加。′-亚甲基双丙烯酰胺(MBA)导致V fT max升高。当将聚合的DEM水凝胶浸入蒸馏水中时,将水溶性ChCl洗出并将水凝胶进一步冷冻干燥。观察到具有平均直径为约150μm的孔的大孔聚丙烯酰胺水凝胶。它们在交替的水和丙酮中​​表现出超快的可逆溶胀和收缩。这项研究暗示了一种简便且绿色的方法,可以在不到6分钟的时间内通过DEM的FP有效制造具有超快速响应特性的大孔聚丙烯酰胺水凝胶。该制备方法绿色环保,低能耗,可持续发展,在环境和生物医学领域具有良好的应用前景。
更新日期:2020-01-14
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