Effect of polymer side chains on the infinite dilution diffusion coefficients of volatile liquids in poly(methyl methacrylate) and poly(ethyl methacrylate) at elevated temperatures
✍ Scribed by David S. Hu; Chang Dae Han
- Publisher
- John Wiley and Sons
- Year
- 1987
- Tongue
- English
- Weight
- 361 KB
- Volume
- 34
- Category
- Article
- ISSN
- 0021-8995
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✦ Synopsis
Effect of Polymer Side Chains on the Infinite Dilution Diffrrsion Coefficients of Volatile Liquids in Poly(methy1 Methacryhte) and PoZy(ethy1 Methacrywe) at Elevated Tempemturns It has beem established that the presence of polymer side chains influences the solubility of volatile solutes in polymers. Saeki et aL' investigated the solubility of noupolar and polar solutes in the homologuee of poly(methacrylats3) and poly(acrylates), namely, poly(methy1 methacrylate) (PMMA), poly(ethy1 methacrylate) (PEMA), poly(methy1 acrylate) (PMA), poly(ethy1 acrylate) (PEA), and poly(n-butyl acrylate) (PNBA). They have found that values of the F'lory-Huggins interaction parameter of organic solutes at W t e dilution were smaller for polymers having long side chains than for polymers having little or no side chains. They have concluded that, for nonpolar solutes. this is attributable to the shielding of the acrylate group by the polymer side
chains and that, for polar solutes, the polymer side chains have a relatively snall influence on the valuea of the interaction parameter. Karim and Bonner2 also have investigated thermodynamic parametem (ag., heat of solution, Flory-Huggins interaction parameter, and specific interaction parameter) of a number of aromatic and aliphatic solutes at W t e dilution in PEMA, using gae-liquid chromatography. However, little has been reported in the literature that deais with the dect of polymer side chains on the difFusivity of volatjle solutes in molten polymers at elevated -P --
In our previous paper: we have reported measurements made of infinite dilution & W o n coe5cients of volatile liquids in polystyrene (FS) and poly(viny1 acetate) (PVAc) at elevated temperatures, using inversa gas chromatography (IGC). As part of our continuing effort on enhancing our undexstanding of the relationships between the structure of a polymer and the dilhivity of a solute in the polymer, we very recently made measurements of infinite dilution dilhion coefficients of volatile liquids in poly(methy1 methacrylate) (PMMA) and poly(ethy1 methacrylate) (PEMA) at elevated temperatures, using IGC. The purpose of the study was to i n v d g a t e the effect, if any, of the polymer side chains on the diffusivity of volatile liquids in amorphous polymers'at elevated temperatures. In this paper, we shall report the results of the investigation.