活性炭对聚丙烯酸水凝胶pH敏感性的影响  

Effect of AC on pH sensitivity of PAA hydrogels

作　　者：杨珊[1,2] 侯玉龙[2] Yang Shan;Hou Yulong(College of Chemistry and Materials, Weinan Normal University, Weinan 714099, China;School of Materials Science and Engineering, Shaanxi Normal University, Xi'an 710119, China)

机构地区：[1]渭南师范学院化学与材料学院,陕西省渭南市714099 [2]陕西师范大学材料科学与工程学院,陕西省西安市710119

出　　处：《合成树脂及塑料》2017年第4期29-32,共4页China Synthetic Resin and Plastics

基　　金：陕西省自然科学基金项目(2017JM2012);渭南市科技计划项目(2016KYJ-3-4);渭南师范学院科研计划项目(15YKF004)

摘　　要：以丙烯酸(AA)为单体、活性炭(AC)为惰性致孔剂、N,N-亚甲基双丙烯酰胺为交联剂、过硫酸铵为引发剂,采用自由基溶液聚合法制备了聚丙烯酸(PAA)/AC复合水凝胶,并研究了AC的引入对PAA水凝胶pH敏感性的影响以及不同pH值的缓冲液中水凝胶的溶胀动力学。结果表明:AC的引入并未影响PAA水凝胶的化学组成和热稳定性,但增大了其孔隙尺寸;AC的引入提高了PAA水凝胶的pH敏感性;冻干的PAA/AC复合水凝胶比烘干的PAA/AC复合水凝胶达到溶胀平衡的速率更快、平衡溶胀比更大。The polyacrylic acid/activated carbon(PAA/AC)composite hydrogels were synthesized viafree radical solution polymerization with acrylic acid(AA)as monomer,AC as pore forming agent,N,Nmethylenebisacrylamide(NNMBA)as crosslinking agent,and ammonium persulfate(APS)as initiator.Theimpact of the introduction of AC on pH sensitivity of PAA hydrogels were observed as well as swelling kineticsof hydrogels in buffer at different pH values.The results showed that the introduction of AC does not change thechemical composition and thermo stability of PAA hydrogels,but increases the pore size of gels.Moreover,theintroduction of AC improved the pH sensitivity of PAA hydrogels.The freeze-dried PAA/AC hydrogels reachedswelling equilibrium faster in a bigger equilibrium swelling ratio than the oven-dried ones.

关 键 词：聚丙烯酸水凝胶 活性炭 PH敏感性 

分 类 号：TQ427.26[化学工程]