聚丙烯酰胺复合TEMPO氧化纳米纤维素的黏性水凝胶

Adhesive Hydrogels Composited by Polyacrylamide with TEMPO-oxidized Nanocellulose

关键词:  黏性  水凝胶  聚丙烯酰胺  TEMPO氧化纳米纤维素

Key Words:adhesive  hydrogel  polyacrylamide  TEMPO-oxidized nanocellulose

摘要:本研究将TEMPO氧化纳米纤维素（TONC）加入丙烯酰胺（AM）单体中，通过自由基聚合制备了具有高强胶黏性能的聚丙烯酰胺（TONC/PAM）复合水凝胶。采用傅里叶变换红外光谱和X射线光电子能谱表征了TONC/PAM复合水凝胶的结构，探讨了TONC/PAM复合水凝胶的形貌、流变和溶胀行为，研究了不同TONC含量的TONC/PAM复合水凝胶对不同基材的拉伸剪切强度。结果表明，随着TONC含量增加，复合水凝胶孔径和溶胀率逐渐变大。当TONC含量为0.4%时，复合水凝胶孔径为（600±50） μm，溶胀率达1700%。当固化时间为48 h时，不含TONC的水凝胶在木材上的最大拉伸剪切强度为5.0 MPa；而TONC含量为0.2%的复合水凝胶的最大拉伸剪切强度可达8.0 MPa。该复合黏性水凝胶在木材和建筑中具有很大的应用潜力。

Abstract:TEMPO-oxidized nanocellulose/polyacrylamide （TONC/PAM） composite hydrogels with strong adhesion were prepared by free radical polymerization of AM with addition of TONC in this study. The structure of TONC/PAM composite hydrogels was characterized by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The morphology， rheological， and swelling behaviors of the prepared TONC/PAM composite hydrogels were discussed. The shear strengths of the TONC/PAM composite hydrogels with different TONC content towards various substrates were investigated. The results showed that the pore size and swelling ratio gradually increased by increased the TONC content. When TONC content was 0.4%， the pore size was （600±50） μm， and the swelling ration was 1700%. When the curing time was 48 h， the maximum shear strengths on wood were 5.0 MPa without TONC and 8.0 MPa with TONC content of 0.2%. Therefore， the TONC/PAM composite hydrogels have great potential for various applications in wood and building.