OALib Journal期刊
细菌纤维素(BC)增强PVA/PVP复合水凝胶的制备及性能表征
DOI: 10.3724/SP.J.1105.2012.11175
Keywords: 细菌纤维素 ,聚乙烯醇 ,聚乙烯吡咯烷酮 ,水凝胶 ,增强
Abstract:
通过冷冻-熔融法制备了细菌纤维素/聚乙烯醇/聚乙烯吡咯烷酮(BC/PVA/PVP)双网络复合水凝胶,并采用X射线衍射,红外光谱,扫描电镜,力学性能测试等手段对凝胶的结构和性能进行表征.研究发现PVA、PVP通过氢键作用均匀地吸附于纤维微丝周围,将BC纤维有效地分开,因而干燥后的复合凝胶在热水中浸泡后仍可恢复原状;X射线衍射结果显示,直接干燥成膜样品和冻干样品的结晶性能差别明显,且PVA/PVP对BC的结晶有抑制作用,而BC增强复合凝胶中PVP对PVA结晶的影响作用与纯PVA/PVP体系类似,即少量PVP的存在对PVA的结晶有促进作用,浓度超过2%的PVP反而对PVA的结晶有抑制作用;力学性能测试结果表明,细菌纤维素的引入,明显地提高了水凝胶的压缩和拉伸性能,并且PVP,PVA含量的变化对材料的力学性能有较大影响;流变测试结果显示,BC增强后的凝胶的储能模量有很大提高,这与力学测试结果相一致.
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