Fe3+交联海藻酸钠/聚乙烯醇/SiO2纳米复合膜的制备及性能研究

Preparation and physicochemical properties investigation of Fe3+ crosslinking sodium alginate/polyvinyl alcohol/SiO2 nanocomposite films

以海藻酸钠(SA)、聚乙烯醇(PVA)、二氧化硅为原料,FeCl3为交联剂,制备了Fe3+交联的SA/PVA/SiO2纳米复合膜,分析了交联剂Fe3+的含量对复合膜力学、结构性能的影响。对复合膜的颜色、厚度和透光度进行观察和测量,并通过拉伸、热重测试对复合膜的力学性能、热力学性能进行研究,通过X-射线衍射(XRD)、红外光谱(IR)、透射电镜(TEM)和扫描电镜(SEM)对复合膜进行结构分析,最后对复合膜的水蒸气透过率进行了测量。结果表明,当Fe3+含量大于2.0 mg时,海藻酸钠复合膜的力学性能得到了很大的提升,断裂伸长率(E)提高了50.8%,最高拉伸强度(Ts)提升到了77.8%,拓宽了该共混膜在食品包装领域的应用。

Fe3+crosslinking sodium alginate/polyvinyl alcohol/silica nanocomposite films were prepared by using sodium alginate,polyvinyl alcohol,silicon dioxide as raw materials and Fe3+as a crosslinker.Effects of different concentrations of Fe3+on the properties of the composite films were investigated.Color,thickness and transparence of the nanocomposites were measured.Then,mechanical,thermodynamic stability and water vapor penetrance were studied.At last,structure of the composite membranes was analyzed by XRD,IR,TEM and SEM.Research results showed elongation at break(E%)was increased by 50.8%and tensile strength(TS)was improved 77.6%,after crosslinking by Fe3+,which will widen the application of this mixed membrane in food packaging field.