Preparation And Properties Of Polyphenysulfone Systems Hybrid With Double-decker Silsesquioxane In The Main Chains

Introducing inorganic or organometallic segments into polymers to obtainorganic-inorganic hybrids with improved properties continues to be a driving force forthe development of new materials. Polyhedral oligomeric silsesquioxane(POSS) is acage-like organic-inorganic hybrid molecule. It has a nanometersized silica-like cagestructure and some of the organic groups bonded to the Si atom are reactive. So POSScan be functionalized with a series of organic groups. Also,because of the organicgroups bonded to Si,they have a good campatibility with the most of polymers. It isworth noting that these polymers which have POSS introduced into, possessed goodthermal stability and mechanical properties,flammability,oxidative resistance,agingresistance etc.In step polymerization system, it is necessary for the monomer to have twoprecisely functional groups to obtain liner high molecular weight polymers. As theDDSQ possess two precisely reactive hydrosilane groups, it can be utilized to makelinear organic-inorganic hybrid polymers. So in this article the double hydroxylfunctionalized cage-like silsesquioxane is synthesized via hydrosilylationpolymerization of DDSQ and eugnol. Then copolymerizing with4-Fluorophenylsulfone and4,4’-Biphenol, a series of PPSU hybrid polymers are obtained, in whichthe ratio of the POSS in the main chain is different. The achievements are describedas follow:Linear polymers with POSS in the main chain are synthesized in the steppolymerization system. The results of DSC and TGA indicate that the Tg values of thecopolymers decreased as the POSS content in the copolymers increased. Moreover,the dielectric constant and the surface energy are also reduced because of theintroduction of the POSS. And the water contact angle determination shows that withthe increasing of the POSS in the main chain, the contact angle is also increasing.