木质素酚在纤维纸张表面层层自组装的研究

Layer-by-layer self-assembly of lignophenols on pulp fiber sheet surface

为实现纤维纸张表面的疏水改性,利用相分离法制备的毛竹木质素酚(LPS)与Cu^(2+)在纤维纸张表面进行层层自组装。通过动态接触角测量和扫描电镜(SEM)分析对纸浆纤维表面进行表征,结果表明:随着自组装层数的增加,纤维表面的接触角逐渐增大,当木质素酚的组装层数达到4层时,两种纸张纤维表面接触角均达到最大,阔叶浆纸张纤维表面接触角达到110.00°,针叶浆纸张纤维表面接触角达到105.50°,纸张表面从高度亲水性转变为具有一定疏水性,相同的疏水改性实验在阔叶浆纸张上效果优于针叶浆纸张。并且木质素酚因小粒径和链状结构的特点能均匀分布在纤维间,增强了纤维间的结合强度,对纸张的强度起到积极作用,以此开发出一种天然、成本低、制备工艺简单、高强度且表面具有疏水性的纤维基功能材料。

Layer-by-layer （LBL） self-assembly of lignophenols （ LPS） and Cu^2＋ were applied to the hydrophobic modiifcation of pulp ifber sheet surface. The modiifed pulp ifber surface was then characterized by means of dynamic contact-angle measurement and scanning electron microscopy （SEM）. The results showed that with the increase of self-assembly layers, the contact angle of ifber surface increased, when the ifber surface has been modiifed with four self-assembly layers, the contact angle of ifber surface reached the maximum, hard wood pulp ifber sheet surface contact-angle reached 110.00° and soft wood pulp fiber sheet surface contact-angle reached 105.50° , which meant that the excessively hydrophilic fiber surface was modified to a hydrophobic one in a certain degree and hard wood pulp fibers compared with soft wood pulp fibers had more obvious effect. Because of the characteristics of small particle size and chain structure, LPS uniformly distributed in pulp ifbers then enhanced the bonding strength between pulp fibers, which had the positive effect on paper strength, and developed a new kind of cellulose functional materials which is natural, easy operation, high strength and hydrophobic on the surface.