欧车前胶-g-聚丙烯酸/黑云母高吸水性树脂的合成与溶胀行为

Preparation and Swelling Properties of pH Responsive Psyllium-Graft-Poly(Acrylic Acid)/Biotite Superabsorbent Composites

以欧车前胶(PSY)、丙烯酸(AA)和黑云母(BT)为原料,N,N′-亚甲基双丙烯酰胺(MBA)为交联剂,过硫酸铵(APS)为引发剂,采用水溶液聚合法制备了欧车前胶接枝聚丙烯酸复合黑云母(PSY-g-PAA/BT)高吸水性树脂。考察了不同含量BT树脂在蒸馏水和盐水中的吸水倍率和溶胀行为。红外光谱和溶胀性能测试结果表明,BT参与了接枝聚合反应,BT的引入明显改善了树脂在蒸馏水和盐水溶液中的吸水倍率,PSY-g-PAA/BT复合高吸水性树脂具有良好的pH敏感性。

A series of novel psyllium gum-g-poly（acrylic acid）/biotite superabsorbent composites with various biotite contents were prepared by the solution polymerization,using ammonium persulfate as the initiator and N,N′-methylenebisacrylamide as the crosslinker.The swelling kinetics of superabsorbent composites with various contents of biobite in distilled water and the swelling behaviour in saline solutions were investigated systematically.Biotite participating in graft polymerization was confirmed by FT-IR spectra and the swelling test.Results indicate that the introducing biotite into psyllium gum-g-poly（acrylic acid） remarkably improves the water absorbency in distilled water and NaCl solutions,also exhibits a pH sensitivity and the excellent reswelling capabilities.Therefore,the superabsorbent composites may be considered as an excellent candidate for agriculture and horticulture applications or as pH-responsive materials.