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Fox-Flory Scaling of Glass Transition and Fragility in Oligomers

The glass transition temperature Tg and dynamic fragility m of homologous polymer series (PS, P2VP, PDMS, PB) are both linear in inverse molecular weight 1/M (Fox-Flory form), and their dielectric relaxation-time curves collapse onto a single SL-TS2 'ideal Boyer polymer' master curve. The characteristic molecular weights are very small (~40-200 g/mol), so Fox-Flory behavior holds for all oligomers and polymers above ~1000 g/mol, extending SL-TS2 near-universality down to low molecular weight.

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New Insights into the Dependence of Glass Transition Temperature and Dynamic Fragility on Molecular

Extends the SL-TS2 (Sanchez-Lacombe two-state, two-timescale) near-universality framework from high polymers to oligomers and low-molecular-weight polymers. Using dielectric alpha-relaxation data for…