Preparation And Characterization Of Functional Polymer Microspheres

In this paper,we designed two kinds system of dispersion polymerization and a soap-free miniemulsion polymerization:(1)We introduced the functional monomer HEA into the dispersion polymerization in the absence of stabilizer to realize the PSH microspheres hydroxyl functionalization.We successfully prepared monodispersed PSH microspheres with particle diameter of 0.39~1.42 ?m;When the system was V(St)=4 ml,V(HEA)=0.4 ml,and m(KSP)/m(St)=0.5 wt%,the dispersion coefficients of the PSH particle was the lowest 0.04,and the particle diameter was 0.77?m(2) we introduced the cationic functional monomer DMC into the dispersion polymerization in the absence of stabilizer.Then make copolymerization with MMA. We successfully prepared monodispersed cationic PMDmicrospheres with particle diameter of 0.13 ~0.3?m.When the system was V(MMA)=4 ml,V(DMC)=0.1 ml,and m(AIBN)=0.1 g, the particle diameter was 0.3?m.(3) We used ultrasonic wave to carry on the homogenization of miniemulsion in the soap-free miniemulsion polymerization,and the charge supplied with the cationic initiator V-50 engendered electrostatic repulsion effect;Through soap-free miniemulsion polymerization cationic initiator monodisperse PMH particle were synthetized with the particle size in the range of 0.07to1.02?m. When the concentration of the co-stabilizers was in a wide range,monodisperse PMH microspheres could be prepared by soap-free miniemulsion polymerization When the system was V(MMA)=10 ml,V(HEA)=0.6 ml,and m(V-50)=0.065 g,the dispersion coefficients of the PMH particle was the lowest 0.02,and the particle diameter was0.46?m.Moreover the charge repulsion effect had a certain role to stabilize soap-free miniemulsion system.And we discussed the stability mechanism of each polymerization.