具有疏水核/亲水壳的双亲胶体粒子的制备

制备了具有疏水性聚苯乙烯核/亲水性聚丙烯酰胺壳的双亲粒子.疏水核通过超浓乳液聚合制备,亲水壳层通过过氧化羟基异丙苯和硫酸亚铁的界面引发制备.控制条件可得到网孔(半包覆)、褶皱(全包覆)两种形态的壳层.壳层孔的存在使得核层聚合物能够与外界接触.粒子的双亲性通过吸水吸油率进行表征.

The Preparation of Amphiphilic Colloidal Particles with Hydrophobic Core and Hydrophilic Shell

Amphiphilic colloidal particles were prepared with hydrophobic polystyrene cores encapsulated by hydrophilic polyacrylamide shells. The polystyrene colloidal particles were prepared by using a concentrated emulsion as a precursor. The polyacrylamide shell is prepared via redox initiation. A notable feature of the particles is that no copolymer jointing portions exist. The hydrophobic cores were just encapsulated by hydrophilic shells. The porous shell ensured the hydrophobic cores accessible to the outside media. As a result, such particles could be dispersed in both water and diesel oil. That is to say, they were compatible with both polar and nonpolar solvents. SEM photographs confirmed the shell structure. The amphiphilicity of the particles was characterized by their water and diesel oil absorbabilities. It was found that polymerization recipes and reaction conditions, the amount of redox initiator, diluent, hydrophilic monomer, crosslinker and the temperature of polymerization, could adjust the structure and thickness of the hydrophilic shells. Such amphiphilic colloidal particles can be used widely in drug delivery and catalytic processes.