Alcohol / Preparation And Characterization Of Polystyrene Composite Nanofibers

In this thesis, different diameter polystyrene (PS) spheres were prepared via soap-free emulsion polymerization method. We studied the effect of synthetic conditions on PS spheres diameter in detail, and found out the optimal conditions to synthesize different diameter PS spheres. And synthetic PS spheres was characterized by SEM. The result indicated that synthetic PS spheres has uniform diameter and smooth surface. In order to determine the optimal concentration of electrospinning precursor solution, we investigated the electrospinning process of polyvinyl alcohol (PVA) solution. SEM showed that nanofibres obtained by electrospinning 8% PVA solution had best surface morphology, smooth surface and uniform diameter. We mixed the different diameter PS spheres with 8 % PVA solution, respectively. The obtained precursor solution was homogeneously dispersed under ultrasonic. Subsequently, electrospinning the precursor solution in terms of 20 KV voltage and 20 cm distance between the spinneret and the collector produced the PVA/PS composite nanofibres. The morphology of composite nanofibres was characterized by SEM. It was found that at the certain concentration ratio range of PVA:PS, PS spheres arranged uniformLy along the longitudinal direction of nanofibres. And the diameter of composite nanofibres increased with increasing PS spheres diameter, it was prone to form composite nanofibres with the pearl serial structure. Then we synthetized PS/CdSe QDS composite microspheres by emulsion polymerization, the PVA/PS/CdSe QDS microspheres nanofibers were prepared by electrospinning.