改性聚天冬氨酸/聚(丙烯酸-丙烯酰胺)互穿网络吸水性树脂的制备及表征

Synthesis and Characterization of Modified Poly(aspartic acid)/Poly(Acrylic acid-acrylamide) Interpenetrating Network Absorbent Resin

以接枝γ-氨丙基三乙氧基硅烷(KH550)的聚琥珀酰亚胺(KPSI)、丙烯酸(AAc)和丙烯酰胺(AM)为原料,过硫酸钾(KPS)为引发剂,N,N’-亚甲基双丙烯酰胺(MBA)为交联剂,采用一步法在水体系中合成了改性聚天冬氨酸/聚(丙烯酸-丙烯酰胺)互穿网络吸水性树脂(KPAsp/P(AAc-AM)IPNAP)。探讨了组成对吸液性能的影响,当KPSI和AAc-AM质量比为1∶2,AM和AAc-AM质量比为1∶5时,IPNAP在去离子水和生理盐水中的溶胀倍率分别为713.5 g/g和145.4g/g。研究了吸水性树脂在不同介质中的溶胀行为,结果表明IPNAP对p H、温度、盐都表现出显著的敏感性。对吸水性树脂进行了傅里叶变换红外光谱、扫描电镜和热失重分析表征,表明制得的IPNAP是由KPAsp和P(AAc-AM)相互贯穿而成,第二网络的引入明显改善了树脂的孔道结构,且IPNAP比KPAsp具有更好的热稳定性。

Modified poly（ aspartic acid） / poly（ Acrylic acid-acrylamide） interpenetrating network absorbent resin（ IPNAP） based on polysuccinimide grafted with γ-aminpropyltriethoxysilane（ KH550）（ KPSI）,acrylic acid（ AAc）and acrylamide（ AM） as raw materials,potassium persulfate（ KPS） as free radical initiator,N,N＇- methylenebisacrylamide（ MBA） as crosslinker,was synthesized by a simple one-step method in an aqueous system. Effects of composition on the absorbing properties were investigated and when the mass ratio of modified polysuccinimide（ KPSI） to AAc-AM is1∶ 2,AM to AAc-AM is 1∶ 5,swelling ratios of IPNAP prepared in distilled water and physiological saline reaches713. 5 g / g and 145. 4 g / g,respectively. The results of swelling behaviors in various mediums show that IPNAP has remarkable temperature-,pH-,and salt- sensitivities. The structure of the resin prepared was studied by Fourier transform infrared spectroscopy（ FT-IR）,scanning electron microscopy（ SEM） and thermogravimetric analysis（ TGA）. Results indicate that IPNAP prepared is composed of modified poly（ aspartic acid）（ KPAap） and P（ AAc-AM）,the incorporation of P（ AAc-AM） significantly improves the pore structure of the resin,and IPNAP has better thermal stability than KPAsp.