Technical Note: On modelling thermo-chemical degradation of poly(lactic acid)

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Khanlou, Hossein Mohammad
Hall, Wayne
Heitzman, Michael T
Summerscales, John
Woodfield, Peter
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2016
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Abstract

A well-established model for simulation of the chain-scission process of polylacticacid (PLA) during thermal processing has been simplified and revised. The key assumption in the new model is that the total number of monomer units is invariant as reactions progress. Surprisingly, this seemingly obvious assumption appears to have been previously overlooked. The revised model no longer requires solution of simultaneous differential equations and, for isothermal conditions, an analytical solution is readily available. The present model is in excellent agreement with the more complex model and experimental results for PLA degradation reported in the literature. This simplified model has potential to be applied to other thermoplastics.

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Polymer Degradation and Stability

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134

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Macromolecular and materials chemistry

Chemical engineering

Chemical engineering not elsewhere classified

Materials engineering

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