The rheological characteristics of polymer compositions in processing processes | Mekhanika | kompozitsionnykh | materialov i konstruktsii
> Volume 14 / 2008 / Pages: 182-201

The rheological characteristics of polymer compositions in processing processes

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Abstract:

The analysis of existing types of rheological equations of state. It is noted that the rheological model described in the literature are very different among themselves. While each approach has its own physical premises, it is currently impossible to describe all the experimental results using a rheological model. The different theories describing the temperature dependence of viscosity. The importance of considering this factor in mathematical modeling, as it is responsible for the relationship reodinamicheskih and thermal processes. This relationship determines the level of hydraulic resistance and qualitatively changes the intensity of heat due to energy dissipation. Analyzed theory used to explain the dependence of the viscosity of the pressure. Carried out a brief review of works devoted to the experimental study of this phenomenon. Noting its practical importance especially for molding rubber compounds under pressure. Various experimental and theoretical data show an exponential dependence of the viscosity of the pressure. When this pressure coefficient of viscosity in the first approximation is constant. We analyzed various formulas that describe the dependence of the viscosity of the conversion thermosets and rubber compounds. It was noted that as a result of a chemical reaction mixture rubber vulcanization completely lose the fluidity, so the functional dependence of the viscosity of the conversion must assume the presence of a gel point at which the viscosity increases indefinitely. Discussed cure characteristics of rubber compounds, experimental and quantitative methods for assessing the isothermal and non-isothermal curing.

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