Cation St / BA / Synthesis Nanospheres QACMs And Adsorbed On Cellulose Fibers

The adsorption of cationic nanospheres on fibers has important implications, such as fiber surface modification, functional textile research, immunology, water pollution treatment. Emulsifier-free ternary emulsion copolymerizations of styrene (St) and butyl acrylate (BA) with two different quaternary ammonium cationic monomers (QACMs), methacryloxyethyl trimethyl ammonium chloride (DMC) and trimethyl(vinylbenzyl) ammonium chloride (VBT), and2,2’-azobis[2-methylpropionamidine] dihydrochloride (AIBA) as an initiator were conducted at80℃, under agitation at300rpm. The cationic copolymer nanospheres of poly (St-BA-DMC) and poly (St-BA-VBT) were finally prepared. The effect of quaternary ammonium cationic monomers (DMC/VBT) on the structure and property of nanospheres was analyzed by scanning electron microscope (SEM), laser particle size analyzer (DLS), differential scanning calorimetry (DSC) test. The cationic nanospheres were absorbed on different cellulose fibers (cotton fiber and bamboo fiber) at various temperatures in a water bath The influence of cationic monomer concentration, temperature on the adsorption rate and the adsorption isotherm on the fiber surface were also measured.The results showed that:The particle size of cationic nanoparticles generally increases with the amount of cationic monomer is decreased with the increased amount of cationic monomers. The diameter of cationic nanoparticles Poly(St-BA-DMC) decreased from100nm to50nm, but the amount of excess DMC amount could lead to an increasing diameter of cationic nanoparticles Poly(St-BA-DMC) about400nm. Surface charge density and the glass transition temperature of the cationic nanoparticles increase with the increasing amount of cationic monomer. When the cationic nanospheres absorbed on the fiber surface, the adsorption rate increased rapidly as the temperature increased. The faster the cationic nanoparticles absorbed on fiber surface, the more amount of nanospheres absorbed on fiber surface after reaching equilibration. The adsorption model matches Langmuir adsorption type. The cationic nanoparticles on the fiber surface presented an uniform monolayer adsorption. Adsorption thermodynamic parameter indicated the cationic nanospheres adsorption on fiber surface was an endothermic, spontaneous and irreversible process.