【摘要】 以改性聚天冬氨酸(MKPAsp)为交联剂,丙烯酸(AA)为单体,过硫酸钾(KPS)为引发剂,通过水溶液聚合法制得可生物降解的聚天冬氨酸/聚丙烯酸(MKPAsp/PAA)复合吸水性树脂,探讨了组成、交联剂和引发剂用量对复合吸水性树脂吸水性能的影响。结果表明:当AA与改性聚琥珀酰亚胺(KPSI)的质量比为5∶1、乙烯基三乙氧基硅烷(A151)用量为0.42%(摩尔分数)、KPS用量为0.2%(质量分数)时,MKPAsp/PAA的吸液性能最好,在去离子水和0.9%NaCl盐溶液中吸液倍率分别为886.7和120.3g/g,比未复合的KPAsp树脂分别提高了3.8和1.1倍。采用红外光谱、扫描电镜和热重等手段对复合吸水性树脂进行了表征,结果表明:PAA的加入不仅能够改善吸水性树脂的孔道结构,使孔径更加规则均匀,而且能够提高吸水性树脂的热稳定性。更多还原

【Abstract】 A novel biodegradable modified poly(aspartic acid)/poly(acrylic acid)(MKPAsp/PAA)composite absorbent resin was prepared with modified poly(aspartic acid)(MKPAsp)as the crosslinking agent,acrylic acid(AA)as the monomer and potassium persulfate(KPS)as the initiator in an aqueous system.The influence of composition and the amount of initiator and cross-linking agent on the water absorbency were investigated.The results indicated that when the mass ratio of AA to polysuccinimide grafted withγ-aminpropyltriethoxysilane(KPSI)was 5∶1,the triethoxyvinylsilane(A151)amount was 0.42mol%,the KPS content was 0.2wt%,the water absorbency of MKPAsp/PAA was optimum with the swelling ratio of 886.7g/g and 120.3g/g in distilled water and 0.9% NaCl solution,which were enhanced by 3.8and1.1times when compared with KPAsp resin,respectively.The resins were characterized by infrared spectroscopy(FT-IR),scanning electron microscopy(SEM)and thermal gravimetric analysis(TG).The result showed that the introduction of PAA not only optimized the pore channel structure and made the pore sizes became uniform,but also improved the thermostability of resin.更多还原