科研之友
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摘要
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.
- 出版日期2013-9-20
- 单位南京大学
