Abstract
The theoretical basis for the prediction of the properties of mixtures of virgin and reprocessed polymers is presented in this text. The theory is developed using degradation equations, that describe the loss of properties of the polymer as a function of the number of processing cycles. The single pass-property loss concept is also utilized to derive algorithms that can be applied to properties with quite complex decay behaviors. Various degradation equations, corresponding to important properties in materials characterization and quality control, such as melt flow index and tensile and impact strengths, are determined. The effect of reprocessing on the degradation of the fibers length, the molecular weight and the mechanical properties of reinforced thermoplastics is explained with the help of the algorithms derived.
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Bernardo, C.A. (1998). Derivation and Validation of Models to Predict the Properties of Mixtures of Virgin and Recycled Polymers. In: Akovali, G., Bernardo, C.A., Leidner, J., Utracki, L.A., Xanthos, M. (eds) Frontiers in the Science and Technology of Polymer Recycling. NATO ASI Series, vol 351. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-1626-0_11
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DOI: https://doi.org/10.1007/978-94-017-1626-0_11
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