不同交联方式的明胶及明胶/蒙脱土纳米复合材料的力学性能

Mechanical Properties of Gelatin and Gelatin/Montmorillonite Nanocomposite Crosslinked via Different Methods

研究了戊二醛(GLA)蒸汽交联、溶液交联以及葡糖二醛溶液交联对明胶及明胶/蒙脱土(MMT)纳米复合材料力学性能的影响,并利用扫描电子显微镜(SEM)对材料的拉伸断口进行了观察。结果表明,与溶液交联相比,明胶蒸汽交联样品的交联度较大。溶液交联时,戊二醛比葡糖二醛交联效率高,相同浓度下试样的力学性能较好。明胶/MMT纳米复合材料无法通过GLA溶液交联方式制样,由于MMT片层的阻隔性,使蒸汽交联需要更长的时间才可达到一定的交联度。与MMT插层复合可大幅度提高明胶材料的力学性能,SEM表明韧性同时得到改善。

Influence of glutaraldehyde (GLA) vapor crosslink, solution crosslink and dextran dialdehydes solution crosslink on the mechanical properties of gelatin and gelatin/montmorillonite (MMT) nanocomposite was investigated Fracture surfaces of the samples were observed by scanning electron microscopy (SEM) The results show that compared with solution crosslink, vapor crosslink could achieve higher crosslinking degree for gelatin material GLA has higher crosslinking efficiency than dextran dialdehydes and mechanical properties of samples are better at same concentration via solution crosslink Gelatin/MMT nanocomposite could not be prepared via GLA solution crosslink It is needed much time for vapor crosslink to reach certain crosslinking degree owing to the barrier property of MMT sheets Intercalated with MMT could improve mechanical properties of gelatin material significantly SEM shows the improvement of toughness at the same time