Preparation And Characterization Of Nano-micropore Latex Particles

Nano-micropore latex particles(multi-hole and hollow)were applied to all kinds of sorbent, carrier or other field, because of its function of adsorption and carry. If the active group were connected to the surface of the latex particles or the hole wall, this material will be connected with bio-macromolecule directly. And the material will have abroad application in environment protection, cosmetic, surgical medicine and other field as a kind of new material of possessing biologic activity. This task was to study such kind of polymer material of preparation of nano-micropore latex particles.In this thesis, hydrophilic AA was chosen as polymerization monomer, and core-cell P ( St-BA-AA ) system were synthesized by emulsion polymerization with P(St-BA) as seed. Nano-micropore latex particles were obtained by the stepwise acid/alkali method at high temperature. The configuration of Nano-micropore inside the latex particles and the surface conformation of latex particles were observed by TEM and SEM. And it was considered that micropore was shaped inside the latex particles. The effects of different seed emulsion dosage,treatment hours of alkali and acid and crosslinking agent on hole forming were discussed.It is found that size distributing of core-cell latex particles uniformity was obtained only by the method of KPS replenishment. The best treatment temperature of alkali and acid of the system P(St-BA-AA)should be above the glass transition temperature(Tg).The size of core-shell particles decrease gradually with the increase of seed emulsion dosage. The latex particles decrease either after the same treatment by the stepwise acid/alkali method, and all particles shrink. When the size of core-shell particles was on the small side, micropore could not be obtained. The course of alkali-swell had important effect on hole forming. With continuance of alkali treatment time, the number of latex particles displaying micropore configuration was increase, and the size of micropore was largen obviously. Proper crosslinking infused into system in emulsion polymerization was useful to forming hollow configuration.For this system, multi-hole and hollow structure can be obtained by controlling reaction conditions. But, how to realize control of the hole amount, size and configuration is still in study.