Study On Preparation And Formation Mechanism Of Composite Particles With Unusual Morphology

With the expansion of the use of particles with special morphology, higher requirements to the control of particle size and morphology emerged. Controlling the polymerization process as a whole has became insufficient to meet the needs of some conditions. So a deeper inquiry into the special morphology formation mechanism and introducing other mature producing methods into this system would be necessary and would greatly improve the controlling abilities.This paper firstly produced NIPAAm by ATRP method. After a comprehension of how to produce PNIPAAm with different molecular, we grafted double bond to the chain end via SN1 reaction. Also ln([M0]/[M]) to time curve did not fit the linearly relationship, it accorded basically with controlled polymerization. All the character methods indicated that double bond had been successfully grafted into the end of chain after SN1 reaction.Then this paper used terpolymerization of maromonomer and AN/St in the mixed media of water and ethanol to produce polymers with different morphologies, Changed the parameters of polymerization temperature and marcomonomer types and concentration to control the particle sizes and morphologies. The results indicated, marcomonomer and total monomer concentration has great influence to the paticle sizes and morphology. Temperature not only changed the morphology, but behaved more in influencing particle sizes and distribution. Both macromonomer and marcopolymer can produce special morphology, macromonomer has better efficacy.In the experiments of studying the special morphology formation mechanism, we firstly produced PSt microspheres in two different routines with two different theories, then we use these microspheres as the core material to produce particles with special morphology. We found out that, the first step of special morphology formation decided the particle sizes. This step has little relation with later steps, which means seeds could be in any sizes or could be produced by any methods. The projection numbers was determined when micro-regions of PAN were formed. The projection height was determined by the degree of deposited PAN chain in the second step. Separation of the projection formation mechanism can map a complex routine into some classical mechanism steps. Then it would be easier to introduce matured controlling methods into the special morphology formation procedure.