Modelling the thermal degradation and stabilisation of PVC in a torque rheometer

Show simple item record Fechter, Reinhard Heinrich Sandrock, Carl Labuschagne, F.J.W.J. (Frederick Johannes Willem Jacobus) 2019-04-10T09:10:53Z 2018-04
dc.description.abstract A novel method for simulating the torque and temperature curves from a torque rheometer thermal stability test on poly(vinyl chloride) (PVC) was developed. A mathematical model was proposed which combines the chemical kinetics involved in the thermal degradation and stabilisation process of PVC with heat transfer and viscosity relationships within the torque rheometer. The model coefficients were fitted to data obtained from previous experiments with a program written in the Python programming language using the Levenberg-Marquardt Algorithm (LMA) with multiple starts. The mathematical model fits the torque rheometer data successfully depending on the characteristics of the torque curve. The model fit is successful when the torque curve follows the expected behaviour. An unsuccessful model fit occurs when the torque curve deviates from the expected shape in a very specific way. In the degradation phase the torque curve increases to a local maximum, decreases to a local minimum and then increases again. The exact reason for the dip in torque is unknown. en_ZA
dc.description.department Chemical Engineering en_ZA
dc.description.embargo 2019-04-13
dc.description.librarian am2019 en_ZA
dc.description.uri en_ZA
dc.identifier.citation Fechter, R.H., Sandrock, C. & Labuschagne, F.J.W.J. 2018, 'Modelling the thermal degradation and stabilisation of PVC in a torque rheometer', Chemical Product and Process Modeling, Volume 13, Issue 3, 20170039, ISSN (Online) 1934-2659, DOI: en_ZA
dc.identifier.issn 1934-2659 (online)
dc.identifier.other 10.1515/cppm-2017-0039
dc.language.iso en en_ZA
dc.publisher De Gruyter en_ZA
dc.rights © 2018 Walter de Gruyter en_ZA
dc.subject Poly(vinyl chloride) en_ZA
dc.subject Thermal degradation en_ZA
dc.subject Torque rheometer en_ZA
dc.subject Layered double hydroxide (LDH) en_ZA
dc.subject Semiempirical model en_ZA
dc.title Modelling the thermal degradation and stabilisation of PVC in a torque rheometer en_ZA
dc.type Article en_ZA

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