CMC-g-PAMPS/APT复合高吸水树脂的溶胀行为及热稳定性能

以2-丙烯酰胺基-2-甲基丙磺酸(AMPS)为单体,凹凸棒黏土(APT)和羧甲基纤维素钠(CMC)为复合组分,采用微波辐射方法制备了CMC-g-PAMPS/APT环境友好复合高吸水性树脂。考察了APT用量对树脂吸水速率、保水性能和反复吸水性能的影响,利用XRD和TG等方法分析了该树脂的结构及其热稳定性能。结果表明,APT和CMC参与了接枝共聚反应,其反应仅在APT的表面进行,单体并没有插入到APT的层间。在APT质量分数为7.5%时,树脂的分解温度主要在250℃以上,具有良好的热稳定性。经过5次反复溶胀后,树脂的吸水倍率较不含APT的树脂提高了近42%。在体系中引入APT能显著提高树脂的吸水速率和保水性能。

Swelling Behaviors and Thermal Stability CMC-g-PAMPS/APT Superabsorbent Resin

Using 2-acrylamido-2-methyl propane sulfonic acid(AMPS) as organic monomer, attapulgite(APT) and carboxymethylcellulose (CMC) as composite components, novel eco-friendly carboxymethyl cellulose-g-poly(2-acrylamido-2-methyl propane sulfonic acid)/attapulgite (CMC-g-PAMPS/APT) superabsorbent composites were synthesized by means of microwave irradiation. The effects of APT content on swelling rate, water retention and reswelling capability were systematically investigated. The chemical structure and thermal stability of superabsorbent composites were characterized by XRD and TG. The results showed that CMC and APT participated in grafting copolymerization reaction. The reaction occurs only in the APT surface,and monomer is not inserted into the APT interlayer.The swelling rate, water retention and thermal stability and reswelling capability of the superabsorbent composites could be remarkably enhanced by introducing a proper amount of APT.