Thermal degradation of polystyrene

Limitations of model-fitting methods for kinetic analysis: Polystyrene thermal degradation

“…An important volume of work has been devoted to the determination of the activation energy and kinetic model describing the thermal degradation of polystyrene (Brems et al , 2011, Chen et al , 2007, Chen and Vyazovkin, 2006, Faravelli et al , 2001, Peterson et al , 2001, Sanchez-Jimenez et al , 2012, Snegirev et al , 2012, Sterling et al , 2001, Westerhout et al , 1997. However, results show a wide divergence in the activation energy values and the kinetic models proposed.…”

Effect of Electron Beam Irradiation on Polymers

“…Their study suggested a significant increase in characteristic dose leading to a radiation damage as the electron beam diameter is reduced from 1 µm to below 1 nm. [24][25][26][27][28][29][30][31][32][33]2018 electron beam radiation damage of other polymers through TEM-EELS technique is also reported in literature [25,27,28]. The kinetic mechanism of polystyrene thermal degradation is being studied by Faravelli et al [29] through kinetic models and predicts the radical formation as the route cause of degradation.…”

“…[24][25][26][27][28][29][30][31][32][33]2018 electron beam radiation damage of other polymers through TEM-EELS technique is also reported in literature [25,27,28]. The kinetic mechanism of polystyrene thermal degradation is being studied by Faravelli et al [29] through kinetic models and predicts the radical formation as the route cause of degradation. A detailed review about the thermal degradation of polystyrene is discussed by Guyot et al [30] which indicates that the radical chain formation in polystyrene during thermal exposure in the range of 280-350 0 C. McNeil et al [31] have also studied the thermal degradation of polystyrene and suggested intramolecular movement in the start of the degradation followed by intermolecular movement.…”

“…[24][25][26][27][28][29][30][31][32][33]2018 There are two peaks observed in this region, which are common for polymers: peak around 5 eV from π to π* transition and peak around 23 eV from (π+σ) to (π+σ)* transition. It has been observed that the peak positions started to shift within fraction of seconds of exposure to the electron beam.…”

“…The order of stability can be translated as PC<PMMA<PET<PS<SMA as deduced from the dose required for degradation. [24][25][26][27][28][29][30][31][32][33]2018 degradation in polymers is unavoidable and the extent of degradation depends on the structure of the polymers.…”