A scheme has been developed for calculating the glass transition temperature and flow temperature of plasticised polymers. The scheme takes into account the chemical structure of the polymer and plasticiser, the molecular weight of the polymer, the intermolecular interaction between the polymer and plasticiser, the van der Waals volume of the repeating unit of the polymer and the plasticiser molecule, and the plasticiser concentration. The thinning effect is also taken into account, as manifested by a reduction in the viscosity of the polymer–plasticiser system with increasing plasticiser concentration.
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