The flow birefringence and rigidity equilibrium of p- and m-aromatic copolyamide molecules

Autor:	V.P Tsvetkov, N.V. Pogodina, B.F Malichenko, O.N Tsypina, T.A Kulichikhina, L.V Starchenko
Rok vydání:	1981
Předmět:	chemistry.chemical_classification Materials science Molecular model General Engineering Thermodynamics Polymer chemistry.chemical_compound Monomer chemistry Deformation mechanism Flow birefringence Polymer chemistry Copolymer Kuhn length Molecule
Zdroj:	Polymer Science U.S.S.R.. 23:2908-2919
ISSN:	0032-3950
DOI:	10.1016/0032-3950(81)90270-7
Popis:	The flow birefringence of the sulphuric acid solutions of poly-p-phenylene terephthalamide and poly-m-phenylene isophthalamide, and of 13 of their copolymers with differing molar contents of the components have been examined. The experimental optical shear coefficients Δn/Δτ have been used to determine the number of monomer units S of the Kuhn segments in all the samples. The molecular models of the homo- and copolymers have been examined. A formula has been arrived at for the chain flexibility 1/S as a function of the copolymer composition Z on the basis of the suggested models. The good correlation of the experimental with the theoretical 1/S-Z function confirms the additivities of the structural and deformation mechanisms of the polymer chain flexibilities.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::66b065e1c22734105c2b8c5c860a5322 https://doi.org/10.1016/0032-3950(81)90270-7 Zobrazit plný text záznamu