Flow birefringence and conformational properties of rigid chain polynaphthoylene benzimidazole

Pogodina, N.V.; Yevlampiyeva, N.P.; Tsvetkov, V.N.; Коршак, В.В.; Виноградова, С. В.; Rusanov, A. L.; Пономарев, И. И.; Lekaye, T.V.

doi:10.1016/0032-3950(88)90221-3

Cited by 2 publications

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“…Nesmeyanov Institute of Organoelement Compounds RAS (Moscow, Russia and presented in the form of films that were used as objects of research: Polynaphthoyleneimidobenzimidazole PNIB was derived from the dianhydride of 1,4,5,8-naphthalenetetracarboxylic acid (DNTA) and 5(6)-amino-2-( p -aminophenyl) benzimidazole (DAB) according to the method [ 14 , 15 ]; Copolynaphthoyleneimidobenzimidazoles of the statistical structure PNI-4: containing 2,2′-disulfobenzidine (DSB) links were prepared by high-temperature polycondensation of DNTA, DAB and DSB. Changing the molar ratio of DAB and DSB regulated the number of links containing “hydrophilic” (acidic) sulfonic groups in the copolymer main chain [ 9 ]; Statistically structured PNI-5 copolynaphthoyleneimidobenzimidazoles based on DAB and 3,5-diaminomesitylene (DAM) were prepared similarly to PNIB and PNI-4 [ 16 ]: …”

Section: Methodsmentioning

confidence: 99%

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Water Sorption by Polyheteroarylenes

2022

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The sorption–diffusion characteristics of rigid-chain glassy polymers based on polyheteroarylenes (PHAs) have been studied in a wide interval of relative humidity and temperatures of thermal treatment of the polymer sorbents. Experimental data on water vapor sorption for polynaphthoyleneimidobenzimidazole (PNIB) and its copolymers with different chemical nature have been obtained. Water diffusion coefficients have been calculated, and parameters of their concentration and temperature dependences have been determined. It was found that water molecules sorbed by PNIB and its copolymers are strongly bounded. Water mobile and cluster states depend on the structure of macromolecules and thermal prehistory of polymer sorbents. It is shown that the translational coefficients of water diffusion for all PHAs are in the range from 10−9 to 10−8 cm2/s. The diffusion coefficients also increase slightly with temperature increasing, and their general dependence on temperature is satisfactorily described by the Arrhenius equation. The average activation energy of water diffusion varies from 24.3 to 25.9 kJ/mol. The hydrate numbers of rigid-chain PHAs functional groups have been determined. The above-mentioned results allow us to predict the sorption properties of heterocyclic macromolecular sorbents with complex chain architecture.

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Section: Methodsmentioning

confidence: 99%

“…Statistically structured PNI-5 copolynaphthoyleneimidobenzimidazoles based on DAB and 3,5-diaminomesitylene (DAM) were prepared similarly to PNIB and PNI-4 [ 16 ]:…”

Section: Methodsmentioning

confidence: 99%