Polymer Reaction Engineering Department, Faculty of Chemical Engineering, Tarbiat Modares University, Tehran, Iran

Free radical (co)polymerization of acrylamide (AAm) and styrene (St) in the presence ofvinyl functionlized silica nanoparticles (VSN) was performed and chains molecular weight weredetermined by measuring intrinsic viscosity. To synthesize VSN, first silica nanoparticles (SN) weremodified by amine groups (Aminated SN, ASN) and in the next step, ASN was the vinyl (VSN)functionalized by treatment of nanoparticles with acryloyl chloride. Acrylamide homopolymerization andacrylamide/styrene copolymerization were done by free radical graft polymerization using ammoniumpersulfate (APS) as the initiator and sodium dodecyl sulfate (SDS) as the surfactant in the presence ofVSN nanoparticles. Acrylamide nature of VSNs double bonds causes participation of them in thepolymerization reaction. Non-attached chains were separated by centrifugation and were dissolved inwater. Intrinsic viscosities of dilute polymer solutions were measured by ubbelohde viscometer. Withintrinsic viscosity data in hand, viscosity- average molecular weight of the synthetized chains wascalculated by existing experimental relationships.

کلیدواژه ها:

free radical graft polymerization ، acrylamide ، vinyl- functionalized silica nanoparti cle