Thermoelastic networks were prepared by end-linking hdroxyl-terminated poly(neopentylglycol hexafluoroglutarate) using tris(p-isocyanate phenyl) thiophosphate as cross-linking agent. The
plot of birefringence versus stress exhibits negative deviations from linearity at elongation ratios larger
than 1.9. The value of the optical configuration parameter Δa is 2.98 Å3 at 5 °C. Theoretical calculations
carried out using the rotational isomeric state model give for this parameter the value of 2.24 Å3, in fair
agreement with the experimental results. The cause of the strong discrepancies between the theoretical
and experimental results observed for the optical configuration parameter of polyesters containing phenyl
groups in the acid residue is discussed.
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