Graft (co)polymerization of acrylamide and styrene onto silica nanoparticles by free radical polymerization: Determining molecular weight by measuring intrinsic viscosity
کد مقاله : 1217-PHYSCHEM20
حسین بی آزار، مهدی عبداللهی *
چکیده مقاله:
Free radical (co)polymerization of acrylamide (AAm) and styrene (St) in the presence of vinyl functionlized silica nanoparticles (VSN) was performed and chains` molecular weight were determined by measuring intrinsic viscosity. To synthesize VSN, first silica nanoparticles (SN) were modified 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 and acrylamide/styrene copolymerization were done by free radical graft polymerization using ammonium persulfate (APS) as the initiator and sodium dodecyl sulfate (SDS) as the surfactant in the presence of VSN nanoparticles. Acrylamide nature of VSNs` double bonds causes participation of them in the polymerization reaction. Non-attached chains were separated by centrifugation and were dissolved in water. Intrinsic viscosities of dilute polymer solutions were measured by ubbelohde viscometer. With intrinsic viscosity data in hand, viscosity- average molecular weight of the synthetized chains was calculated by existing experimental relationships.
کلیدواژه ها:
free radical graft polymerization, acrylamide, vinyl- functionalized silica nanoparticle
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