微波辐射合成三元共聚高吸水性树脂

PREPARATION AND PROPERTIES OF TERNARY COPOLYMER SUPERABSORBENT PREPARED VIA MICROWAVE IRRADIATION

以N,N′-亚甲基双丙烯酰胺(NMBA)为交联剂,以丙烯酸(AA)、丙烯酰胺(AM)、2-丙烯酰胺基2-甲基丙磺酸(AMPS)为单体,在不加引发剂和无氮气保护的情况下,微波辐射合成AA/AM/AMPS共聚高吸水性树脂。通过单因素实验得出了反应的最佳条件为:n(AMPS):n(AA):n(AM)=1:2:1,pH=2.25,w (NMBA)=0.025%;采用FT-IR、AFM和DSC-TGA等对树脂结构、表面形态及热稳定性进行了表征。结果表明,在优化条件下高吸水性树脂其吸蒸馏水倍率为1 819 g/g,耐热性表明在60℃的环境中树脂吸水率高达745 g/g;在305℃之前树脂较稳定,且重复使用性好。

Using N, N＇-methylene- bis- acrylmide （ NMBA ） as crosslinker, a superabsorbent of acrylic acid（AA）, acrylamide （AM） and 2-acrylamido-2-methylpropanesulfonic acid （AMPS） copolymer was prepared in an aqueous solution by microwave irradiation polymerization in the absence of initiator and nitrogen atmosphere. The influence on water absorbency was investigated via single factor test. The optimum conditions were found as follows： n（AMPS） ： n（AA） ： n（AM） = 1 ： 2 ： 1, 0. 025M NMBA and pH = 2.25. The molecular structure, surface morphology and thermal stability of the resin were characterized by FT-IR, DSC-TGA and AFM. The results showed that the product has the absorbing power of 1 819 （g/g） for distilled water under the optimum conditions and an absorbency of 745 g/g in the 60℃ water; the thermal decomposition temperature is about 305℃;DSC-TGA analysis showed that the product has good thermal stability and reusability.