SA/PAM/GO纳米复合水凝胶的制备和性能

Preparation and Properties of Sodium Alginate/Polyacrylamide/Graphene Oxide Nanocomposite Hydrogels

用原位聚合法制备海藻酸钠(SA)/聚丙烯酰胺(PAM)/氧化石墨烯(GO)纳米复合水凝胶,用X射线衍射、原子力显微镜、红外光谱、热失重、扫描电镜等手段对GO及复合水凝胶的结构与性能进行表征,研究了GO含量对材料的结构、机械性能及溶胀性能的影响。结果表明:在聚合物体系中均匀分散的GO片层提高了分子之间的相互作用,并参与形成凝胶网络,显著提高了材料的强度与韧性。与纯SA/PAM凝胶相比,拉伸强度和断裂伸长率提高了近200%,压缩强度从2.95 MPa提高到4.3 MPa,而溶胀率随着GO量的增加呈先上升后下降的趋势,随着SA含量的增加呈上升趋势。

Nanocomposite hydrogels of sodium alginate（SA） / polyacrylamide（PAM）/ graphene oxide（GO） were prepared by in situ polymerization.The structure and properties of hydrogels were characterized by X-ray diffraction（XRD）, scanning electron microscopy（SEM）, atomic force microscope（AFM）,Fourier transform infrared spectroscopy（FTIR） and thermogravimetric analysis（TG）. The effect of GO content on the chemical structure, mechanical and swelling properties of the hydrogels was investigated.The results show that the well exfoliated GO flakes could be uniformly dispersed in the polymer matrix,therewith the intermolecular interactions between the components might be enhanced and parts of PAM macromolecules chains were probably grafted onto the GO nanosheets, which in turn changed the microstructure of the hydrogels and resulted in significant enhancement of mechanical properties of the composite hydrogels. As a result, in comparison with the two hydrogeles of pure SA and pure PAM, the prepared composite hydrogels exhibited both of higher tensile strength and breaking elongation up to 200%,as well as a higher compressive strength up to 156%. The swelling capacity of the composite hydrogels increased and then declined with the increasing GO content, while increased with the increasing SA content.