The investigation of the thermodynamic and physical properties of copolymers of acrylonitrile with 3-mesitylene-2-oxo-propyl methacrylate homopolymer

ABSTRACTMaster ThesisTHE INVESTIGATION OF THE THERMODYNAMIC AND PHYSICAL PROPERTIES OFCOPOLYMERS OF ACRYLONITRILE WITH 3-MESITYLENE-2-OXO-PROPYLMETHACRYLATE HOMOPOLYMERSERKAN AKSARFırat UniversityGraduate School of Natural and Applied Sciencies,Department of Chemistry2006, Page: 77In this work, 2-oxso propyl methacylate monomer with aryl side group such as mesitylwas prepared from the reaction of sodium methacrylate with the oxirane compound obtainedfrom the chlorhydrine. Polymerisation of 3-mesityl-2-oxso-propyl methacrylate (MOPMA)obtained was carried out by using AIBN an initiator in presence of 1,4-dioxane solvent at 60oC.It?s copolymer was preparad by- acrylonitrile (AN) under conditions above mentioned. Thestructures of monomer, homopolymer and copolymer were characterized by IR, 1H-NMR and13C-NMR techniques.The glass transition temperatures Tg of poly(MOPMA) and poly(MOPMA-co-AN)were measured by DSC. The thermal stabilitzes of poly(MOPMA) and poly(MOPMA-co-AN)were determined by TGA. The molecular weights of the copolymer and homopolymer weredetermined by GPC. The solubility parameters of homopolymer and copolymer were foundcalculated with titration methods at room temparetures.Thermodynamic properties of polymer-probe systems were investigated by usinginverse gas chromatography (IGC) technique. For this purpose, poly(MOPMA) andpoly(MOPMA-co-AN) were deposited on to the chromosorb W and was packed within coppercolumn, then the hydrocarbons and alcohols were injected at different temperatures and thespecific retention volumes were determined.XIThe glass transition temperature (Tg) were determined by the plot of lnVgo against 1/T.The glass transition temperatures of homopolymer and copolymer were found as 88 0C and 780C, respectively. The healts of the adsorption of probes on the poly(MOPMA) andpoly(MOPMA-co-AN) polymers at the temperatures below the glass transition temperaturewere found. Above the glass transition temperature ∆H1s, ∆S1s and ∆G1s values of probes forsorption were determined. Furthermore, weight activity coefficients (a1w1)∞, Flory-Hugginsinteraction parameters (X1,2), partial molar free energies (∆G1∞) and partial molar heats (∆H1∞)values of probes and infinite dilution were computed. These values showed weil agreement withthe values of polymer-nonsolvent systems. The solubility parameters (δ2) of poly(MOPMA) andpoly(MOPMA-co-AN) polymers vere determined by means of values of the Flory-Hugginsinteractions parameters. It was seen that the solubility paramet decreased with the increasingtemperature.Keywords : Synthesis, 2-oxso Propyl Methacrylate, Inverse Gas Chromatography, WeightActivity Coefficients, Flory-Huggins Interactions Parameters, SolubilityParameters.XII