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

dc.contributor.authorFechter, Reinhard Heinrich
dc.contributor.authorSandrock, Carl
dc.contributor.authorLabuschagne, F.J.W.J. (Frederick Johannes Willem Jacobus)
dc.contributor.emailcarl.sandrock@up.ac.zaen_ZA
dc.date.accessioned2019-04-10T09:10:53Z
dc.date.issued2018-04
dc.description.abstractA 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.departmentChemical Engineeringen_ZA
dc.description.embargo2019-04-13
dc.description.librarianam2019en_ZA
dc.description.urihttps://www.degruyter.com/view/j/cppmen_ZA
dc.identifier.citationFechter, 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: https://doi.org/10.1515/cppm-2017-0039.en_ZA
dc.identifier.issn1934-2659 (online)
dc.identifier.other10.1515/cppm-2017-0039
dc.identifier.urihttp://hdl.handle.net/2263/68951
dc.language.isoenen_ZA
dc.publisherDe Gruyteren_ZA
dc.rights© 2018 Walter de Gruyteren_ZA
dc.subjectPoly(vinyl chloride)en_ZA
dc.subjectThermal degradationen_ZA
dc.subjectTorque rheometeren_ZA
dc.subjectLayered double hydroxide (LDH)en_ZA
dc.subjectSemiempirical modelen_ZA
dc.titleModelling the thermal degradation and stabilisation of PVC in a torque rheometeren_ZA
dc.typeArticleen_ZA

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