Heydarifard Solmaz, Gao Weijue, Fatehi Pedram
Chemical Engineering Department, Lakehead University, 955 Oliver Road, Thunder Bay, Ontario P7B 5E1, Canada.
ACS Omega. 2019 Aug 30;4(12):15087-15096. doi: 10.1021/acsomega.9b01953. eCollection 2019 Sep 17.
Chitosan-based hydrogel has received considerable interests because of its appealing properties and applications in many areas. The primary objective of this work was to produce novel cationic chitosan-based hydrogels via polymerizing chitosan with two cationic monomers of the same structure but with different counter ions [2-(methacryloyloxy)ethyl]trimethylammonium methyl sulfate (METMS) and [2-(methacryloyloxy)ethyl]trimethylammonium chloride (METAC). Polymerization of chitosan with the cationic monomers performed under the conditions of 50 °C, 5 h, 7 pH, and 2/1 mol/mol monomer/chitosan led to chitosan-METMS and -METAC with the cationic charge densities of 3.22 and 2.88 mequiv/g, respectively. Elemental analysis, gel permeation chromatography, Fourier transform infrared, X-ray diffraction, and differential scanning calorimetry analyses were used to confirm the impact of counter ions of cationic monomers (i.e., polarizability of monomers) on their polymerization performance and the characteristics of induced chitosan-based hydrogels. Also, the results of this work postulated that the counter ions associated with the monomers could dramatically impact the water uptake and swelling properties of the generated chitosan-based hydrogels as well as their performance in adsorbing an anionic dye from a simulated solution.
基于壳聚糖的水凝胶因其具有吸引人的特性以及在许多领域的应用而受到了广泛关注。这项工作的主要目的是通过使壳聚糖与两种结构相同但抗衡离子不同的阳离子单体——甲基硫酸[2-(甲基丙烯酰氧基)乙基]三甲基铵（METMS）和氯化[2-(甲基丙烯酰氧基)乙基]三甲基铵（METAC）——聚合来制备新型阳离子壳聚糖基水凝胶。壳聚糖与阳离子单体的聚合在50℃、5小时、pH值为7以及单体/壳聚糖摩尔比为2/1的条件下进行，得到了阳离子电荷密度分别为3.22和2.88毫当量/克的壳聚糖-METMS和壳聚糖-METAC。采用元素分析、凝胶渗透色谱、傅里叶变换红外光谱、X射线衍射和差示扫描量热法分析来确认阳离子单体的抗衡离子（即单体的极化率）对其聚合性能以及诱导生成的壳聚糖基水凝胶特性的影响。此外，这项工作的结果推测，与单体相关的抗衡离子会显著影响所生成的壳聚糖基水凝胶的吸水和溶胀性能以及它们从模拟溶液中吸附阴离子染料的性能。
