AM/NIPAM对P(NIPAM-co-AM)温敏凝胶性能影响

Research on the influence of feed composition with AM and NIPAM on properties of P(NIPAM-co-AM) thermo-responsive gel

摘要:

以丙烯酰胺(AM)、N-异丙基丙烯酰胺(NIPAM)为单体，过硫酸铵(APS)-亚硫酸氢钠(SBS)为氧化-还原引发体系，N,N'-亚甲基双丙烯酰胺(BIS)为交联剂，制备了亲水型温敏凝胶P(NIPAM-co-AM)。研究了投料比AM/NIPAM对凝胶性能的影响。结果表明：随着凝胶体系中亲水单体AM比例的增大，共聚凝胶溶胀率、保水率、硬度均提高。当AM从0增大到100%时，凝胶硬度从84.929g增为1255.222g。DSC表明，当AM含量从2%提高到10%时，凝胶LCST从38.61℃增加到57.95℃。随着AM比例降低，凝胶LCST向低温方向移动，相变范围温敏性越好。

Abstract:

Thermo-responsive hydrogels were synthesized by N-ispropylacrylamide(NIPAM) and acrylamide(AM) with N,N'-methylenebiscrylamide(BIS) as crosslinker, ammonium potassium and sodium bisulfite as initiators. The effects of the properties were studied by the change of feed composition. The results show that with the increase of hydrophilic monomer AM, the swelling ratio, water retention and hardness of P(NIPAM-co-AM) are enhanced. The hardness increases from 84.929g in absence of AM to 1255.222g when AM is 100%. According to DSC, when the dosage of AM increases from 2% to 10%, the LCST of P(NIPAM-co-AM) gel increases from 38.61℃ to 57.95℃. With the decrease of AM content, LCST of P(NIPAM-co-AM) gel declines, the responsibility is improved.