The Preparation Of Aqueous Free Radical Reaction Initiators And The Application For Preparating Nanomaterials

We have prepared some aqueous azo-initiators by the catalyzed reaction of azobisisobutylnitrile with some alcohols in the given ratio according to the Pinner Reaction. We used the IR and H-NMR to characterize the structures of the aqueous free radical initiators and assaged their molecular weight. The experimental results show that the preparation of the aqueous azo-initiators by the Pinner reaction are not only high yield,but also their water-solubility are very good. So they can be the initiators of the Emulsion polymerization in macromolecular synthesize.We used the mesoporous SiO₂ as the reactor for the radical polymerization reaction and above aqueous azo-initiators to synthesize some high ordered nanorod polymers. We also prepared some biblock copolymers that are core-shell composite particles by emulsion polymerization using prepared PAE as initiators.We used SEM,TEM,FT-IR, H-NMR techniques to identify and confirmed the structure of mesoporous silica materials and the polymers. Scanning electron microscopy(SEM) images reveal that the biblock copolymers of the PEG-b-PSt are spherical, and their diameters vary form about 200nm to300nm. Especially , the morphology of the product PAE-3 is more order than others. And the diameters of spherical pdrticles can be varied adjusting the quantity of the surfactant.