Study on Synthesis of Silicone-Polystyrene Core-Shell Microspheres with Different Initiation Systems
The silicone-polystyrene polymer emulsion with core-shell structure was prepared by semi-continuous emulsion polymerization with hydroxyl silicone oil and styrene as the materials.Then the polymer powder was prepared by spray drying.The effects of three initiation systems on the stability of polymer emulsion and monomer conversion were investigated and analyzed by IR and TEM.The results show that silicone-polystyrene copolymer has been successfully synthesized,and the prepared poly-mer emulsion has obvious core-shell structure and good stability.The polymer emulsion prepared by APS-NaHSO3-BPO initiation system,has the highest conversion rate of 93.24%.The polymer powders prepared by APS-NaHSO3-BPO initiation system has been characterized by DSC and TGA.There's no obvious weight loss peak at-50-180℃,and the thermal weight loss reaches 61.91%at 500-580℃,which indicates that the polymer has good resistance to high-low temperature,it can be used in a wide range of temperature and keep good performance.
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