Crystallization studies on linear aliphatic n-polyurethanes

C.E. Fernández, M. Bermudez, R.M. Versteegen, E.W. Meijer, A.J. Muller, S. Munoz-Guerra

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Abstract

A detailed crystallization study of the linear n-polyurethane (n-PUR) family for n ranging from 5 to 12 was carried out by DSC supported by polarizing optical microscopy. The study embraces crystallization of all the n-PUR under both nonisothermal and isothermal conditions. The odd and even series of n-PUR defined by the parity of the number of methylenes (n) contained in the polymer repeating unit are considered and separately analyzed. All the members of the two series showed a thermal behavior consistent with their chemical constitution. Isothermal crystallization data were analyzed by the kinetics Avrami approach which revealed that the "crystallizability" of n-PUR increases steadily with the flexibility of the polyurethane chain. Melting and enthalpy temperatures of isothermally and nonisothermally crystallized n-PUR were found to vary with n according to a zig-zag plot characteristic of odd-even effect. Given the structural similitude of n-PUR with (n 2)-nylons, results were referenced to those reported for this family of polyamides.
Original languageEnglish
Pages (from-to)1368-1380
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume47
Issue number14
DOIs
Publication statusPublished - 2009

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