Adsorption Conductometric Titration Of Cationic Polymer Nanoparticles On The Surface Of The Cellulose Fibers

Due to the strong electrostatic attraction between the negative charged cellulose fibers and cationic polymer nanoparticles, cationic polymer nanoparticles could easily adsorb on the surfaces of cellulose fibers. Based on the adsorption characteristics, cationic polymer particles not only are used in the paper industry, but also are widely used in textile dyeing and finishing industry, such as coating finishing, pigment printing, fiber surface modification. Therefore, the research on the adsorption process of cationic polymer nanoparticles onto cellulose fibers has important theory and application values.In the present study, cationic polymer nanoparticles were prepared wiht styrene and butyl acrylate acid as monomers, methacryloyloxyethylcetyldimethyl ammonium bromide as an emulsifier, azo-bis-isobutyl hydrochloride as an initiator through semi-continuous emulsion polymerization and batch emulsion polymerization. The monomer conversions, particle sizes and surface charge densities were measured. The results showe that the prepared cationic polymer nanoparticles had uniform sizes less than100nm. Compared to batch cationic emulsion polymerization, cationic polymer nanoparticles prepared by semi-continuous cationic emulsion polymerization had larger particle sizes and larger surface charge densities.The conductometric titration method was used to investigate the adsorption of nanoparticles onto cotton and bamboo fibers The concentration of nanoparticles was analyzed by measuring the counter-ion concentration on nanoparticle surfaces. It was found that the concentration of the polymer nanoparticles had a good linear relationship with their surface counter-ion concentrations Adsorption of cationic polymer nanoparticles on cellulose fibers was consistent with the Langmuir adsorption model. Increasing adorption temperature was benefit to the adsorption of nanoparticles on fibers. Nanoparticles with smaller size and higher surface charge density had higher absorption rates and higher adsorption amounts.