聚乙烯醇-苯乙烯基吡啶盐缩合物/细菌纤维素复合多孔材料的制备与表征

Synthesis and Characterization of Polyvinyl Alcohol Bearing Styrylpyridinium Group / Bacterial Cellulose Composite Porous Materials

通过紫外光交联与冷冻干燥结合的方法制备了聚乙烯醇-苯乙烯基吡啶盐缩合物(PVA-Sb Q)/细菌纤维素(BC)复合多孔材料。用紫外分光光谱追踪不同照射时间PVA-Sb Q的交联程度;采用扫描电镜表征复合多孔材料的表面形貌;借助傅里叶变换红外光谱仪、热失重分析仪、X射线衍射对复合材料的结构与性能进行研究;DCAT21表面张力仪探讨复合材料的吸液性能。结果表明,紫外光照120 min时PVA-Sb Q完全交联,加入PVA-Sb Q使复合多孔材料的结构变得规整,平均孔径从108 nm增加到1090 nm,呈现分层孔级的结构,孔层之间有粘连现象,孔隙率达到94%。复合多孔材料的热稳定性提高,结晶度指数由0.65降到0.55,吸液速度明显提高,吸液量由284 mg/cm^3提高到了715 mg/cm^3。

Polyvinyl alcohol bearing styrylpyridinium group（ PVA-Sb Q） / bacterial cellulose（ BC） composite porous materials were prepared via UV cross-linking and freeze drying. The degree of cross-linked PVA-Sb Q at different exposure time was characterized by UV spectra; composite materials morphologies were characterized by SEM; the structure of two-phase composite materials was characterized by FT-IR,TGA,XRD; finally the water absorption performance of composite materials was discussed through DCAT21 surface tension meter. PVA-Sb Q was is in 120 min. The results indicate that with PVA-Sb Q added,the structure of composite materials become neat,and the mean porous diameter increases from 108 nm to 1090 nm. There are hierarchical level holes in composite porous materials. The adhesion phenomenon is found in hole layer. The porosity of composite porous materials is up to 94%. The crystallinity of the composites reduces from 0. 65 to 0. 55. Thermal stability and water absorption rate are increased. Water absorption quality is increased from 284 mg / cm^3 to 715 mg / cm^3.