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- W2073457841 abstract "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." @default.
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- W2073457841 date "1994-11-01" @default.
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- W2073457841 title "Gas permeabilities of bisphenol bridge-disubstituted polyarylates" @default.
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- W2073457841 doi "https://doi.org/10.1007/bf02757584" @default.
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