BC/PAM双网络水凝胶的制备及性能研究

Preparation and Study of Bacterial Cellulose/Polyacrylamide Double-Network Hydrogel

为了改善细菌纤维素(BC)的物理及机械性能,扩大其在医用材料及功能材料等领域的应用,以细菌纤维素为基体,丙烯酰胺(AM)为单体,N,N-亚甲基双丙烯酰胺(MBA)为交联剂,采用自由基聚合的方法在BC骨架中引入聚丙烯酰胺(PAM)网络,获得BC/PAM双网络水凝胶。采用扫描电镜(SEM)、热重分析(TGA)对其形态结构及热稳定性进行研究,同时分别研究了单体和交联剂浓度对复合材料的溶胀、保水以及机械性能的影响。结果发现,随着单体和交联剂浓度的增加,BC/PAM水凝胶的溶胀和保水性均获得一定程度的改善。另外,增加单体浓度,复合材料的杨氏模量明显上升,形态结构更加致密,热稳定性显著提高。

In this work, a double-network （DN） hydrogel material, bacterial cellulose/polyaerylamide （BC/PAM） was prepared by combining BC as the first network with PAM as the second network, via flee radical polymerization using acrylamide （AM） as the monomer, and N, N-methylene bisacrylamide （MBA） as a cross-linker, in order to improve its mechanical and physical properties. Effects of the concentrations of AM and MBA were investigated on the swelling ratio, water retention rate and mechanical property of BC/PAM DN hydrogel. It was found that increasing the concentrations of both AM and MBA improved the mechanical strength of the DN gel. And the water retention rate was greatly enhanced with the increase of MBA concentration. Meanwhile, scanning electron microscopy （SEM） and thermogravimetric analysis （TGA） were used to study the morphological structure and thermostability of the DN gel. The results showed that increasing the concentrations of AM, the morphological structure of BC became denser, and the themaostability of BC was improved obviously.