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- W1541036670 abstract "Abstract In this paper is given an analysis of the results of the investigation of the polydispersity of polycondensation products, with linear polyarylates as an example. It has been shown that with an increase of the extent of reaction in the process of high‐temperature polycondensation, the role of the interchange reactions grows, leading to the permutation of the units of macromolecules. As a result of such permutation of the units the polydispersity of the samples obtained by the high‐temperature polycondensation decreases. For the products of the interphase polycondensation the coefficient of the polydispersity remains near two, regardless of the extent of reaction. The investigation of this work has shown that the MWD of the branched polyarylates resulting from the high‐temperature polycondensation is greatly influenced by the reaction of polycondensation equilibrium. In spite of the high degree of branching the polydispersity coefficient remains the same as for the linear polyarylates. It has been shown that the Zimm‐Stockmayer theory for the polyarylates in question gives more actual values of branching than the Zimm Kilb theory. The found empirical dependence between the parameters of the Mark‐Houwink equation for linear and branched polyarylates K = 0.268 (6.03 10 −5 ) a is similar to that found earlier for the polyamides and polyesters." @default.
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- W1541036670 date "1967-01-01" @default.
- W1541036670 modified "2023-10-18" @default.
- W1541036670 title "Investigation of branched polyarylates" @default.
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- W1541036670 doi "https://doi.org/10.1002/polc.5070160518" @default.
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