Different Synthetic Cationic Acrylate Monomer Nanospheres Adsorbed On Cellulose Fibers

Adsorption of nanospheres on fibers has important significance in the fields of textile functionalization, paper toughening and fiber reinforced materials. In the present work, a polymerizable emulsifier, methacryloxyethyl hexadecyl dimethylammonium-bromide, and three acrylic monomers were used to copolymerize with styrene for preparing cationic monodispersed nanospheres. Effects of pH, electrolyte concentration, nanosphere concentration, temperature, contact time and surface charge density on the adsorption of cationic nanospheres on bamboo fibers were investigated by colloid titration method. A facile nephelometry was used to study the adsorption of cationic nanospheres on cotton fabrics modified by carboxymethyl cellulose. The adsorption mechanism and the and thermodynamic parameters were analyzed. The morphology of nanospheres on fibers was observed by SEM.The results show that the three kinds of nanospheres had smaller particle sizes ranged from40nm to50nm and good monodispersity. The higher the solubility of the acrylic mo no mer, the smaller the particle size, the higher the surface charge density and the higher the glass transition temperature of nanospheres. When the pH value was less than7or the concentration of electrolyte (NaCl) was below0.02g/L, the three kinds of nanospheres had good stability. With increasing pH, adsorption amounts increased gradually. There was a maximum amount of nanospheres on bamboo fibers when the pH value was between5to7. And electrolyte had little effect on the adsorption amount when the concentration of electrolyte was lower than0.02g/L. Increasing contact time, the adsorption amount increased while the adsorption rate declined gradually. Equilibrium adsorption was reached at2h. A higher surface charge density of nanospheres led to a higher adsorption amount on fibers. In addition, after modification with the CMC, the negative charge density of fiber surfaces increased obviously and the adsorption amount increased significantly. The adsorption amount increased significantly with rising temperature. The main driving force for nanospheres to adsorb onto cellulose fibers was electrostatic attraction force. Langmuir equilibrium model could well-described the adsorption process. SEM observation revealed that a uniform mono layer of nanospheres presented on CMC-modified fiber surfaces. Thermodynamic parameters indicated that the adsorption was a spontaneous and chemical process.