Influence of the monomer sequential distribution on the mechanical properties and temperature dependence of an ethylene–tetrafluoroethylene copolymer in association with the phase‐transition behavior

Abstract

AbstractThe temperature dependence of the mechanical properties of a series of ethylene–tetrafluoroethylene copolymers was interpreted reasonably on the basis of experimental information about the crystalline phase transition and the amorphous‐glass transition behaviors. The crystalline phase‐transition temperature, the glass‐transition temperature, and the bulk modulus were found to depend sensitively on the tetrafluoroethylene content. The magnitude of change in the bulk modulus at the crystalline phase‐transition temperature and glass‐transition temperature was also found to depend sensitively on the tetrafluoroethylene content. These experimental data were interpreted from various levels, including the distribution of the sequential ratios of ethylene–ethylene, tetrafluoroethylene–tetrafluoroethylene, and ethylene–tetrafluoroethylene segments in the copolymer chains. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009