细菌纤维素/聚丙烯酰胺水凝胶的制备及性能表征  

PREPARATION AND CHARACTERIZATION OF BACTERIAL CELLULOSE/POLYACRYLAMIDE HYDROGEL

作　　者：张晶晶[1] 容建华[1] 李文迪[1] 林志丹[1] 张秀菊[1] 

机构地区：[1]暨南大学材料科学与工程系,广州510632

出　　处：《高分子学报》2011年第6期602-607,共6页Acta Polymerica Sinica

基　　金：国家自然科学基金(基金号20604010);暨南大学"211工程"生物材料与组织工程创新基金;广东省自然科学基金(基金号8451063201000041)资助项目

摘　　要：通过自由基聚合在细菌纤维素(BC)网络中引入聚丙烯酰胺(PAM),制备了细菌纤维素/聚丙烯酰胺(BC/PAM)复合水凝胶,并采用扫描电子显微镜(SEM)、红外光谱(IR)、热失重分析(TGA)、X射线衍射(XRD)和力学测试等手段对复合凝胶的结构和性能进行了研究.研究结果显示在复合水凝胶中,虽然PAM自身没有交联,但由于BC和PAM之间形成强烈的氢键相互作用,PAM并不会被水溶出,而是均匀地分布于BC的网络结构中,将BC微纤有效地分隔开,避免了BC微纤在干燥过程中容易聚集的缺点;溶胀率测试结果显示复合凝胶复水能力强,BC干燥后可完全恢复,并且复合凝胶的干燥收缩由纯BC水凝胶的各向异性转换为各向同性;其他结果显示BC/PAM复合水凝胶的热稳定性、压缩强度和模量获得明显提高,另外PAM的引入使得BC纤维在干燥过程中的(110)晶面的取向结构发生变化.Bacterial cellulose/polyacrylamide composite hydrogel（BC/PAM） was prepared through free radical polymerization in which polyacrylamide（PAM） was introduced into the network of bacterial cellulose（BC）.Structure and properties of composite hydrogels were studied through scanning electron microscopy（SEM）,infrared spectrum（IR）,thermal gravimetric analysis（TGA）,X-ray diffraction（XRD） and mechanical testing.SEM images of freeze-dried composite gels showed that polyacrylamide dispersed uniformally inside the network of BC and also coated on the surface of BC microfibers,which avoided the aggregation of BC mircofibers because of hydrogen bond during the drying process.It was found that the rehydration capacity of composite gels had been greatly enhanced and the shrinking of hydrogels converted to isotropic compared with the anisotropy of pure BC.IR results indicated that hydrogen bond interation formed significantly between BC and PAM,by which stable networks of PAM and BC formed although the cross-linker wasn＇t used during the polymerization of AM.X-ray diffraction results showed that PAM had a certain impact on the orientation of crystal face（10） during the drying process.TG results showed that the thermal stability of the composite hydrogels significantly increased.The first decomposite temperature increased to 385℃ compare with 320℃ of pure BC.Compression testing results indicated that the mechanical properities increased greatly.The compression strength and modulus of BC/PAM composite hydrogels increased to 2350 kPa and 212 kPa compared with 130 kPa and 8.36 kPa of the pure BC,respectively.

关 键 词：细菌纤维素 聚丙烯酰胺 水凝胶 压缩强度 

分 类 号：O648.17[理学—物理化学]