Relaxation Behavior Study of Silicone Rubber Crosslinked Network Under Static and Dynamic Compression by Electric Response

The macroscopical deformation and the microcosmic molecule motions of the polymer matrix under static and dynamic compression can be studied by observing and analyzing the corresponding electric response of its electrically conductive composite. The resistance of silicone rubber/graphite nanosheet nanocomposite under static and dynamic compression changes in different ways, which reflects clearly the corresponding deformation characteristics: under static compression, resistance relaxation occurs, according to which it is concluded that the constant strain transforms over time from the initial elastic one to the viscoelastic one; under dynamic compression, the resistance rises with continuously increasing strain, in terms of which it is considered that short relaxation times may not allow the transformation of strain to happen and the elastic strain is dominative. A similar expression of Burgers equation was adopted here for describing resistance relaxation of SR/GN nanocomposite and the Burger's model without the dashpot in series for the crosslinked polymer network was also used to model the corresponding deformation characteristics of the polymer matrix. POLYM. COMPOS., 30:101-106, 2009. (C) 2008 Society of Plastics Engineers