A concept of polymeric networks with sliding junctions for the time-dependent response of filled elastomers
نویسنده
چکیده
Constitutive equations are derived for the time-dependent behavior of particlereinforced elastomers at isothermal loading with finite strains. A rubbery polymer is modelled as a network of macromolecules bridged by junctions which can slip with respect to the bulk material under straining. A filled elastomer is thought of as an ensemble of meso-regions where sliding occurs with different rates. Stress– strain relations for a particle-reinforced rubber are developed by using the laws of thermodynamics. For tensile relaxation tests, these equations are characterized by three adjustable parameters. To determine the experimental constants, three series of relaxation tests are performed for longitudinal strains in the range from 100 to 250 %. By fitting observations, the influence of pre-loading and thermal recovery is analyzed on the nonlinear viscoelastic response of natural rubber reinforced with carbon black. Key-words: Filled elastomers, Viscoelasticity, Finite strains, Polymeric networks, Constitutive equations
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