Sorption of Benzene, Dichloromethane, and n-Propyl Acetate by Poly(methyl methacrylate)/ Polystyrene Copolymers at 323.15 K Using a Quartz Crystal Balance

Abstract

Solvent activity versus solvent weight fraction are reported for benzene, dichloromethane and n-propyl acetate in each of two different poly(methyl methacrylate)−polystyrene copolymers and for dichloromethane and n-propyl acetate in polystyrene homopolymer. Results were obtained at 323.15 K for low solvent weight fractions using a quartz crystal balance. A modified Flory−Huggins equation is used to interpret the data.

Sorption of Benzene, Toluene, and Ethylbenzene by Poly(ethyl methacrylate) and Plasticized Poly(ethyl methacrylate) at 298.15 K Using a Quartz Crystal Microbalance

“…Sorption results for benzene in PEMA have been reported previously by Sé and Aznar for temperatures of 303.15 and 313.15 K and for benzene weight fractions between approximately 0.01 and 0.1, and by Wong et al at 298.15 K and for benzene weight fractions between 0.06 and 0.3. The infinite dilution activity coefficient at 417.7 K for benzene in PEMA has been reported by Hao et al We have been unable to locate sorption data for toluene or ethylbenzene in PEMA or sorption data for any of the three solvents in DINCH or DIOA-plasticized PEMA.…”

“…We were unable to locate data from the literature for any of these systems taken under identical conditions of polymer molecular weight (340 000) and temperature (298.15 K). However, weight fractions of benzene in PEMA have been reported by Séand Aznar 8 for temperatures of 303.15 and 313.15 K and by Wong et al 1 at 323.15 K. The polymer used by Wong is identical to the PEMA of this study, but the molecular weight of the PEMA used by Séand Aznar was 850 000. The activity versus weight fraction curves for benzene in PEMA are plotted in Figure 9 for all three studies.…”

“…The plasticizer can be considered to be a second solvent that is nonvolatile. The expression for the activity of a volatile solvent (1) in such a mixture can be obtained from eq 4 as…”

“…As part of a continuing study of the solubility of organic compounds in polymers and copolymers, − we present here sorption data for benzene, toluene, and ethylbenzene (BTEX compounds, together with xylene) in poly­(ethyl methacrylate) (PEMA) and plasticized PEMA. Experimental results were obtained at 298.15 K using a quartz crystal microbalance/flow apparatus that has been applied in earlier studies. , The focus of the present work is to study the effect of solvent sorption by adding a plasticizer to the polymer deposited on the quartz crystal.…”

Sorption of Benzene, Toluene, and Ethylbenzene at Low Concentrations by Plasticized Poly(ethyl methacrylate) and Polystyrene Polymers Using a Quartz Crystal Microbalance at 298.15 K

“…Solubility data of organic compounds in polymers and co-polymers from the quartz crystal microbalance (QCM) have produced interesting thermodynamic results and interpretation. − In this study, we present solubilities of benzene, toluene, and ethylbenzene (BTEX compounds, along with xylenes) in plasticized poly­(ethyl methacrylate) (PEMA) and polystyrene (PS) at 298.15 K using a QCM equipped with a new vapor generation system to target low concentrations. As part of the continuing study on the effect of added plasticizers on solvent sorption, three plasticizers, diisononyl cyclohexane-1,2-dicarboxylate (DINCH), diisooctyl azelate (DIOA), and n -butyl stearate (BS), have been added to the homopolymers of PEMA and PS.…”