Eriksson Malin, Notley Shannon M, Wågberg Lars
Department of Fibre and Polymer Technology, KTH-Royal Institute of Technology, SE-10044 Stockholm, Sweden.
J Colloid Interface Sci. 2005 Dec 1;292(1):38-45. doi: 10.1016/j.jcis.2005.05.058. Epub 2005 Jul 1.
Polyallylamine hydrochloride (PAH) and polyacrylic acid (PAA) have been used to build up polyelectrolyte multilayers (PEM) on wood fibres and on silicon oxide surfaces, under various pH conditions. Consecutive adsorption onto silicon oxide surfaces of PAH and PAA were studied using stagnation point adsorption reflectometry, and the results showed a steady build-up of multilayers. Furthermore, by altering pH, the build-up of the multilayer could be made either linear or exponential in terms of adsorbed amount. Nitrogen analysis of sheets prepared from modified fibres showed that the adsorbed amount of PAH increased throughout PEM build-up, the amount of increase depending on pH during adsorption. Strength measurements of the sheets, i.e., stress at break and strain at break, showed significant improvements ranging from 60 to 200%, depending on both pH during adsorption and type of polyelectrolyte in the outer layer. A good correlation between the adsorbed amount of PAH and the improved strength properties of the paper was also found.
在不同pH条件下，已使用盐酸聚烯丙胺（PAH）和聚丙烯酸（PAA）在木纤维和氧化硅表面构建聚电解质多层膜（PEM）。使用驻点吸附反射法研究了PAH和PAA在氧化硅表面的连续吸附情况，结果显示多层膜稳定形成。此外，通过改变pH，多层膜的形成在吸附量方面可以呈线性或指数形式。对由改性纤维制备的纸张进行氮分析表明，在整个PEM形成过程中，PAH的吸附量增加，增加量取决于吸附过程中的pH。纸张的强度测量，即断裂应力和断裂应变，显示出显著提高，提高幅度在60%至200%之间，这取决于吸附过程中的pH以及外层聚电解质的类型。还发现PAH的吸附量与纸张强度性能的改善之间具有良好的相关性。
