智能水凝胶的制备研究

Preparation of Intelligent Hydrogels

以N-乙烯基吡咯烷酮（NVP）、丙烯酸（AA）为原料,N,N′-亚甲基双丙烯酰胺为交联剂,过硫酸钾（K2S2O8）为引发剂,采用自由基聚合合成水凝胶。分别研究了原料配比、交联剂用量、引发剂比例、盐浓度、p H对水凝胶吸水能力的影响,确定了最佳用量及条件。结果表明,NVP/丙烯酸共聚物水凝胶的最佳条件为：丙烯酸跟NVP的质量比为1∶1.1~1∶1.2,引发剂的用量为丙烯酸单体质量的4%~5%,交联剂的用量为丙烯酸单体质量的7%~8%。水凝胶的吸水率随着盐浓度的增加而减小,p H为7~9时水凝胶的吸水率最高。

N-vinyl pyrrolidone（NVP） and acrylic acid（AA） as raw materials, N, N ′-methylene double acrylamide as crosslinking agent, potassium persulfate（K 2S2O8） as the initiator, hydrogels was synthesized by the radical polymerization. The raw material ratio, the dosage of crosslinking agent and initiator, salt concentration, the influence of water gel pH on water absorbing capacity, was study respectively. The best dosage and conditions were determined. The results showed that the best condition were： mass ratio of NVP/acrylic copolymer hydrogel was 1：1.1~1.2, the dosage of the initiator was 4%~5% acrylic monomer, the amount of crosslinking agent was 7%~8% of acrylic monomer. The hydrogel bibulous rate decreased with the increase of salt concentration. When the pH of 7~9, the hydrogel bibulous rate was the highest.