核-壳结构粒子的制备及其在聚酯中的成核效应:Ⅰ单分散SiO2/PS核-壳复合粒子的制备

TQ32; To enhance the nucleation and crystallization properties of polyester (e.g., polyethylene terephthalate, PET),core-shell structured particles are used to improve these properties by controlling the inorganic dispersion properties in the polymers. In the paper, monodisperse particles of silica/polystyrene (PS) are prepared with both dispersion and emulsion polymerization techniques. The monodisperse silicon dioxide particles are first prepared with the seed growth method and modified by the coupling agents. Silica is properly modified with KH-570, and its size deviation is 3.0% or so. The modified silica then reacts with the mixture of ethanol, water medium, and monomer of styrene under dispersion polymerization. Results show that the dispersion polymerization technique is more suitable for monodisperse core-shell SiO2/PS particles than that of the emulsion.The morphology and molecular structure of the core-shell particles are investigated with the transmission electron microscope (TEM), and fourier tran