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Gas Permeation in Polyarylates: Effect of Bisphenol and Acid Substitution Symmetry by U.K. Kharul; S.S. Kulkarni; M.G. Kulkarni; A.Y. Houde; S.G. Charati; S.G. Joshi is a Materials Science article available to read on EtoBox.

What is Gas Permeation in Polyarylates: Effect of Bisphenol and Acid Substitution Symmetry about?

The effect of bisphenol substitution symmetry on gas permeation as well as other relevant structural properties of polyarylates has been investigated both experimentally and by molecular modelling. Asymmetric or di-substitution of methyl groups on the phenyl rings of bisphenol-A or phenolphthalein resulted in polyarylates with similar packing density and permeability and with increased permselectivity compared to the corresponding polymers with the unsubstituted bisphenols. Symmetric or tetra-substitution of methyl groups on the bisphenol-A phenyl rings led to polyarylates with decreased packing density, increased permeability and similar selectivities as the corresponding polymers with the unsubstituted bisphenol. Molecular modelling studies of the chain conformation gave further insight into the mechanism by which substitution symmetry affects the polymer properties. The differences in the minimum energy chain conformation of symmetrically and asymmetrically substituted bisphenol-A polyarylate chains help in explaining the variation in packing density and permeation properties. Calculations of relative bond flexibility and the energy barrier for bond rotation of specific moieties

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Author

U.K. Kharul; S.S. Kulkarni; M.G. Kulkarni; A.Y. Houde; S.G. Charati; S.G. Joshi

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0032-3861)

Published

1998

Language

EN

Field

Materials Science (Physical Sciences)