聚丙烯酰胺/玄武岩纤维复合水凝胶的制备及性能

Preparation and Properties of Polyacrylamide/Basalt Fiber Composite Hydrogels

近年来,玄武岩纤维因其高强度、耐高温、优良的耐候性以及良好配伍性等优势,近年来被尝试用于改性PAM水凝胶体系以提升其力学性能。然而,现有改性方法易于受到外界长时间作用力的破坏,从而严重影响水凝胶功能的发挥。为解决这一问题,通过γ-甲基丙烯酰氧基丙基三甲氧基硅烷(TMSPMA)与玄武岩纤维(BF)反应,制备含双键修饰的BF(BF-TMSPMA)。将丙烯酰胺(AM)与BF-TMSPMA混合后进行反应,制备BF改性的聚丙烯酰胺复合水凝胶(PAM/BF-TMSPMA)。BF-TMSPMA改性后,复合水凝胶的力学性能得到明显提高。当BF-TMSPMA浓度为1mg·mL^(-1)时,复合水凝胶拉伸强度为40.1±5.4 kPa,为PAM水凝胶的12.8倍;复合水凝胶断裂伸长率为2700.2%±25.8%,为PAM水凝胶的5.4倍;复合水凝胶杨氏模量为45.8±3.4 kPa,为PAM水凝胶的12.7倍;复合水凝胶韧性为450.4±14.8 kJ·m^(-3),为PAM水凝胶的30.6倍。复合水凝胶也具有良好的自修复性能,切断的水凝胶自修复后断裂伸长率达2217.2%±31.6%,拉伸强度为18.6±5.6 kPa。复合水凝胶可用于孔雀石绿染料吸附分离,吸附效率可达98.2%,吸附3 h即可达到饱和。

In recent years,basalt fibers have been used to modify PAM hydrogel systems to improve their mechanical properties due to their advantages of high strength,high temperature resistance,excellent weather resistance and good compatibility.However,the existing modification methods are easily damaged by the external force for a long time,which seriously affects the function of hydrogels.To solve this problem,in this work,basalt fiber(BF)andγ-methacryloxypropyltrimethoxysilane(TMSPMA)were reacted to prepare double bonds modified BF(BF-TMSPMA).And then BF-TMSPMA and acrylamide(AM)were reacted to obtain BF modified polyacrylamide(PAM)composite hydrogels(PAM/BF-TMSPMA).The mechanical properties of the composite hydrogel were significantly improved after the addtion of BF-TMSPMA.When the concentration of BF-TMSPMA was 1mg·mL-1,the tensile strength of the composite hydrogel was 40.1±5.4 kPa,12.8 times that of PAM hydrogel;The breaking elongation of the composite hydrogel was 2700.2%±25.8%,5.4 times that of PAM hydrogel;The Young's modulus of the composite hydrogel is 45.8±3.4 kPa,12.7 times that of PAM hydrogel;The toughness of the composite hydrogel is 450.4±14.8 kJ·m^(-3),30.6 times that of PAM hydrogel.The composite hydrogel exhibited good self-healing properties.The elongation at break after self-healing was 2217.2%±31.6%,and the tensile strength was 18.6±5.6 kPa of healed hydrogels.