细菌纤维素晶须/聚(丙烯酸-丙烯酰胺)复合高吸水性树脂

BACTERIAL CELLULOSE WHISKER/POLY(ACRYLIC ACID-co-ACRYLAMIDE) SUPER-ABSORBENT COMPOSITE RESINS

利用硫酸水解细菌纤维素(BC)的方法制备具有一定长径比的细菌纤维素晶须(BCW),利用TEM对其进行表征,发现BCW具有较好的单分散性.将细菌纤维素晶须(BCW)与丙烯酸、丙烯酰胺复合制备高吸水性树脂.根据Box-Behnken中心组合实验设计原理,采用三因素三水平的响应面分析法,对交联剂、引发剂以及晶须投加量进行优化组合,确定最佳配比,并构建了以饱和吸水倍率为函数,以各影响因素为变量的回归模型.经吸水性测试发现,添加量仅为0.05 wt%的BC晶须在合适的条件下吸水倍率可达自身重量的600倍左右,在盐溶液中也有较高的吸水性能.SEM形貌表征显示细菌纤维素晶须(BCW)的加入使得树脂网孔结构更加蓬松.红外光谱显示高吸水性树脂由聚丙烯酸、聚丙烯酰胺与纤维素晶须复合而成.

Bacterial cellulose whisker（BCW） with certain aspect ratio was fabricated by the method of sulphuric acid hydrolysis.It exhibits outstanding monodispersion morphology as shown in the TEM micrographs.The super-absorbent composite resins were prepared by graft copolymers of acrylic acid（AA） / acrylamide（AM） and the hydrated bacterial cellulose whiskers（BCW）.The dose of crosslinking agent,free radical initiator,and BCW content was optimized according to Box-Behnken central composite with three factors and three levels response surface methodology.Furthermore,a regression model containing the three factors mentioned above,was constructed where swelling ratio was regarded as the function and the factors as the variables.Swelling behaviors indicated that the resin containing only 0.05 wt% BCW showed the highest water swelling ratio（SR） of 600 g·g-1,and also with a good performance in certain saline solution.SEM images showed that the addition of BCW into the resin matrix increased the average-dimension of pores,making it as a porous resin,which illustrated the reason why it may hold more water.FTIR spectroscopy showed that BCW indeed existed in the network of poly（acrylic acid-co-acrylamide） matrix.