利用静电逐层自组装技术,在再生纤维表面沉积了阳离子聚丙烯酰胺（CPAM）/羧甲基纤维素（CMC）复合膜。研究了不同pH条件下CPAM/CMC在再生纤维表面的静电吸附规律。采用FT-IR、SEM和Zeta电位测试对再生纤维表面的聚电解质多层膜进行表征,而再生纤维力学性能用纸页的裂断长和耐破指数来评价。研究表明,CPAM/CMC聚合物电解质在再生纤维表面的交替吸附,引起纤维电性变化,说明吸附动力来自于静电作用力。体系pH条件对纤维保水值及再生纤维力学性能产生较大影响。当pH值为7.5时,自组装5层的再生纤维,保水值提高了19.19%,裂断长和耐破指数分别增大了71.38%、89.63%。
Layer-by-layer self-assembly of cationic polyacrylamide（CPAM）/carboxymethyl cellulose（CMC） on recycled fibers was carried out,and the effect of pH value on the electrostatic layer-by-layer self-assembly was also discussed.The dynamic features and formation mechanism during the polyelectrolyte multilayers build up were characterized by Zeta potential analyzer and FT-IR techniques,the morphology of the CPAM/CMC multilayers on the surface of recycled fibers was observed by SEM.The results show that the build up of polyelectrolyte multilayers is indicated by the change of Zeta potential of recycled fiber slurry,showing a significant improvement in fiber surface smoothness.It is also found that there is a significant improvement in the paper strength under a less value pH condition.When the pH value is 7.5,recycled fiber self-assembled for 5 layers,the water retention value,break length and bursting index of recycled fibers increases by 19.19%,71.38%,89.63%,respectively.
参考文献
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