Preparation And Strain Rate Effects On Nylon-6/montmorillonite Nanocomposites

In recent decades, materials science represented by nanotechnology has been developing by leaps and bounds and nanotechnology is extremely influencing on the other disciplines, industry and society. In Nanotechnology, polymer nanocomposites relying on their superior performance is gradually permeating all the field of people's production and life.As the first polymer nanocomposites be used , nylon 6 / montmorillonite nanocomposites has been researching deeply and extensively in many respects including: preparation, montmorillonite additive surface modification, macroscopic mechanical properties, the micro structure characterization of montmorillonite in nylon 6 matrix, material thermodynamics properties and many other aspects. Nylon 6 / montmorillonite nanocomposites is a kind of nonlinear viscoelastic materials. On resolving nonlinear viscoelastic problem, extending elastic recovery correspondence principle to the nylon 6 / montmorillonite nanocomposites is definitely valuable.Presently, the study of nonlinear viscoelastic constitutive relationship and rate correlation on this material were rare.This paper aims to extend elastic recovery correspondence principle in nonlinear viscoelastic constitutive relationship from pure material to the nylon6 / montmorillonite nanocomposites'constitutive relationship and rate dependent theory.The main research contents of this paper can be drawn as follows:1.Polyamide 6(PA6)/montmorillonite(MMT) nanocomposite was synthesized via in-situ polymerization. And the MMT proportion levels are 0wt%,1 wt %,3 wt %and 5wt%.2.The tensile tests were performed at different stress rates. And the instantaneous elastic constitutive relationship is obtained by using using the elastic recovery correspondence principle in nonlinear viscoelastic constitutive theory.3. The nonlinear viscoelastic stress-strain curves under different strain rates are predicted. It is shown that the dependence of the strain rate of the stress-strain curves under different strain rates is the direct result of the hereditary time effect, so that it is unnecessary to include the strain rate in the constitutive relations as an independent variable.