Preparations Of Hollow Particles And Studies Of Interfacial Self-assembly

Interfacial polymerization and self-assembly to prepare functional hollow materials is an effective and novel method. In this paper, firstly, the influential factors on the morphology of hollow latex particles preparation during shell polymerization stage of emulsifier-free seed emulsion polymerization were investigated. Monodispersed hollow latex particles were obtained and further functional composite particles were also fabricated. The monodispersed hollow latex particles were self-assembled into colloidal crystal. Secondly, the self-assembly of latex particles at emulsion droplet interface and subsequently linked together to form microcapsules was researched. The influential factors that control self-assembly of latex particles at droplet interface and the morphology of the particles aggregates in the systems of sulphonated polystyrene latex particles and acrylate latex particles were studied and mechanically stable porous microcapsules were obtained. By interfacial polymerization of oil phase monomers in emulsion stabilized by particles, cagelike polymer microspheres with hollow core/porous shell structure were prepared. The mechanism of the formation of hollow core/porous shell and the controlled factors of the microspheres morphology were discussed. Combining interfacial polymerization with using macromonomer, water-in-oil emulsion droplets were used as template and hollow polystyrene particles were obtained. The conditions of the formation of hollow particles and structure properties of macromonomer were researched. The main results obtained in this dissertation are described as follows:1. Hollow polymer latex particles containing a hydrophilic core fully encapsulated with a hydrophobic shell were prepared by multistage polymerization followed by neutralization with a base. The diameters of the particles were monodispersed and void fractions of the prepared latex particles as high as 50% were achieved. The influential factors on the morphology of hollow latex particles preparation during shell polymerization stage were investigated. High instantaneous monomer conversion was found to be the key point to minimize the interdiffusion of the core-shell polymer chains. The influences of the the first-shell formation, shell...