Synthesis And Surface Modification Cation P (St-co-BA) Nanoparticles Of Cellulose Fibers

Cationic nanospheres are widely used in various fields due to their important peculiarities, such as nanoscale, monodispersity and strong adsorption ability on negatively charged surfaces. The modification of fibers with cationic nanospheres can endow the fibers with well properties, such as aging resistance, UV resistance, flame resistance.Cationic St-BA copolymer nanospheres were prepared through batch cationic emulsion polymerization with styrene (St) and butyl acrylate (BA) as non-ionic monomers, cetyltrimethyl ammonium chloride (CTAC) as emulsifier, and azobis isobutyl amidine hydrochloride (AIBA) or azo diisopropyl imidazoline hydrochloride(AIBI) as initiator. The effects of the concentration and molecular structure of initiators on polymerization kinetics, such as instantaneous conversions and colloidal features, such as particle size, PDI and particle morphology were analyzed. Cotton fabrics and bamboo fibers were modified with St-BA nanospheres and then the modified fibers were dyed with acid dyes. The effects of process parameters on surface modification were studied by measuring the colors of the fabrics. SEM was used to monitor the fiber surfaces before and after the modification.The results-shows that no matter which initiator was used higher initiator amount resulted in higher instantaneous conversion rate and final monomer conversion, higher surface charge density, smaller particle size and higher PDI. Higher monomer conversion rate, larger particle number and smaller particle size were obtained when AIBI was used as initiator. The morphology and monodispersity of the nanospheres were observed via transmission electron microscopy.The modification of cotton and bamboo fibers with cationic nanospheres completed in60min, resulting in the saturation adsorption of the cationic nanospheres on fiber surface. Increasing the modification temperature in a certain range can increase the amount of nanopheres on modified fiber surfaces. Higher nanosphere concentrations during the modification process resulted in more nanopheres on the fiber surfaces. The amount of nanospheres on the fiber surface decreased with the increase of the ionic strength in the dispersion system. When the pH was neutral, the nanophere amount on fiber surfaces reached the maximum. The fiber surface after CMC pretreatment could absorb more nanopheres. According to the SEM photos, a large amount of nanospheres were adsorbed on the modified fiber surfaces. The distribution of the nanospheres was uneven on fiber surfaces. The dyeing process of the modified fibers did not change the morphology of the nanoshperes on the fiber surfaces.