S S Kulkarni
Articles written in Bulletin of Materials Science
Volume 17 Issue 6 November 1994 pp 1071-1077
This study reports the physical properties and gas permeation characteristics of polyarylates prepared by disubstitution of the bisphenolA bridge carbon. The results are compared with data from previously reported unsubstituted and mono-substituted polyarylates. Disubstitution is an effective method of changing the packing density, as measured by the d-spacing, and also increases the chain stiffness. The intersegmental spacing can be either decreased (by phenyl disubstitution) or significantly increased (by -CF3 disubstitution). Increased d-spacing in the case of -CF3 disubstitution increases permeabilities and reduces selectivities compared to the unmodified bisphenolA based polymer. The increased permeability and selectivity of the phenyl disubstituted polyarylates, in spite of the reduced d-spacing, supports an earlier finding that decreased bisphenol phenyl ring mobility tends to increase permeability.
Volume 17 Issue 7 December 1994 pp 1307-1315
This paper reviews recent investigations of the factors which control gas transport in a series of highly aromatic polyarylates. The polymer physical properties which correlate with its intrinsic separation characteristics were elucidated by studying well-defined families of polyarylates. Molecular modelling was used to understand the effects of various substitutions in the polymer structure and the mechanism through which the polymer properties are affected. The effect of polymer chain mobility, conformation and packing density on the permeation characteristics are discussed.
Volume 44, 2021
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Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020
Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
Physical Sciences 2020
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