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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/13705

Title: Rheological characterization on thermal degradation of ethylene-tetrafluoroethylene copolymer
Authors: Kotera, Seigo
Yamaguchi, Masayuki
Keywords: Ethylene-tetrafluoroethylene copolymer
rheological properties
molecular weight distribution
Issue Date: 2014-08-04
Publisher: Elsevier
Magazine name: Journal of Fluorine Chemistry
Volume: 166
Start page: 117
End page: 121
DOI: 10.1016/j.jfluchem.2014.07.020
Abstract: Oscillatory shear modulus in the molten state is evaluated carefully considering the rheological change during the measurement at high temperature for ethylene-tetrafluoroethylene copolymer (ETFE). The results provide the information on the molecular weight distribution as well as the degradation behaviors, which is affected by the environmental condition, i.e., the existence of oxygen. Even under a nitrogen atmosphere, ETFE is thermally unstable in the molten state; ETFE shows random chain scission reaction without crosslinking. The steady-state shear compliance J_e^0, which depends on the molecular weight distribution greatly, is not changed during the chain scission. It suggests that the chain scission occurs with keeping the molecular weight distribution. Considering the classical theory on the random scission reaction, the experimental result indicates that M_w/M_n of the initial ETFE sample, prior to the exposure to thermal history, is closed to 2. In contrast, under air condition, ETFE shows crosslinking reaction even in the cone-and-plate rheometer. The degree of crosslinking is quantitatively estimated by the plateau modulus G’_<plateau> in the low frequency region. The result suggests that the crosslinking occurs as a first order reaction.
Rights: Copyright (C)2014, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International license (CC BY-NC-ND 4.0). [http://creativecommons.org/licenses/by-nc-nd/4.0/] NOTICE: This is the author's version of a work accepted for publication by Elsevier. Seigo Kotera, Masayuki Yamaguchi, Journal of Fluorine Chemistry, 166, 2014, 117-121, http://dx.doi.org/10.1016/j.jfluchem.2014.07.020
URI: http://hdl.handle.net/10119/13705
Material Type: author
Appears in Collections:c10-1. 雑誌掲載論文 (Journal Articles)

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