多孔PVA/CNFs复合水凝胶的制备与性能

Preparation and Properties of Porous PVA/CNFs Composite Hydrogel

目的研究聚乙二醇(PEG)的加入对复合凝胶微观结构、溶胀性能和热稳定性的影响,扩大复合凝胶在包装领域的应用。方法以PEG为致孔剂,纳米纤维素(CNFs)为增强相,利用物理交联法制备出多孔聚乙烯醇/纳米纤维素复合水凝胶。结果 PEG作为致孔剂时可制得网络互穿结构的多孔水凝胶,复合凝胶的溶胀度可达到1000,相比于纯PVA水凝胶有极大的提高,同时加入CNFs的聚乙烯醇凝胶与纯的聚乙烯醇凝胶相比具有更好的热稳定性。结论这种有着高溶胀性和良好热稳定性的多孔复合凝胶可用于包装产品的保鲜与物流防护。

In order to expand the application of composite gel in packaging field, the effect on the microstructure of composite gel by PEG was studied. Also the swelling property and thermal stability of composite hydrogel were studied. In this study, polyethylene glycol（PEG） and cellulose nanofibers（CNFs） were used as the pore forming agent and the r einforcing phase, respectively. And the porous nano cellulose/polyvinyl alcohol composite hydrogel was prepared by physical crosslinking method. The results showed that the interpenetrating network structure of porous hydrogel could be prepared when PEG was used as the pore forming agent. Compared to pure PVA hydrogel the swelling degree of comp osite hydrogel has been greatly improved, which could reach to 1000. Meanwhile, composite hydrogel had better thermal stability with CNFs incorporated compared to pure PVA hydrogel. In conclusion, Porous composite hydrogel can be used in preservation of packaging products and logistics protection.