Preparation and Application of Functional Microsphere (II) Formation and Characteristics of Poly(ethylene-co-vinylacetate) Microsphere with Disperse Dye

Abstract : Poly(ethylene-co-vinylacetate) (EVA) microspheres were prepared by thermally induced phase separation(TIPS) in toluene. The microsphere formation occurred by the nucleation and growth mechanism in metastable region.The effects of the concentration and component of the polymer and cooling rate on microsphere formation were inves-tigated. The microsphere formation and growth were followed by the cloud point of the optical microscope measurement.The microsphere size distribution, which was obtained by particle size analyzer, became broader when the polymer con-centration was higher, the content of vinyl acetate in EVA copolymer was higher, the cooling rate of EVA copolymer solu-tion were lower. The content of disperse dye in EVA microsphere was obtained by TGA thermal analysis, the dye contentof EVA15 and EVA18 were 3.5 and 2.0 wt% respectively.Key words :microsphere, particle size, thermally induced phase separation(TIPS), disperse dye, Poly(ethylene-co-vinylacetate)copolymer