Feng Xianhua, Pouw Kristin, Leung Vincent, Pelton Robert
Department of Chemical Engineering, JHE-136, McMaster University, Hamilton, Ontario, Canada.
Biomacromolecules. 2007 Jul;8(7):2161-6. doi: 10.1021/bm070307r. Epub 2007 Jun 15.
The adhesion of wet regenerated cellulose to colloidal complexes formed between carboxymethyl cellulose (CMC) and polyvinylamine (PVAm) was evaluated by measuring the force to delaminate pairs of regenerated cellulose membranes bound together with polyelectrolyte complex. The most important parameter was the surface composition of the colloidal complex particles. High delamination forces corresponded to using complexes coated with excess PVAm whereas low adhesion was observed for both CMC coated complexes and complexes in which the PVAm was replaced with polymer bearing quaternary amine groups. Adhesion with complexes was highest at pH 4 and rather insensitive to pH from 6 to 9. Finally, mild TEMPO/NaBr/NaClO oxidation of the cellulose gave much stronger adhesion when PVAm was in excess but not with the CMC rich complexes.
通过测量将再生纤维素膜对与聚电解质复合物结合在一起进行分层所需的力，评估了湿再生纤维素与羧甲基纤维素（CMC）和聚乙烯胺（PVAm）之间形成的胶体复合物的粘附力。最重要的参数是胶体复合物颗粒的表面组成。高分层力对应于使用涂覆有过量PVAm的复合物，而对于涂覆有CMC的复合物以及PVAm被带有季胺基团的聚合物取代的复合物，均观察到低粘附力。在pH 4时，与复合物的粘附力最高，并且在pH 6至9范围内对pH相当不敏感。最后，当PVAm过量时，纤维素的温和TEMPO/NaBr/NaClO氧化产生更强的粘附力，但对于富含CMC的复合物则不然。
