Development of structure–property relationships that allow independent control of glass transition temperature, melting temperature, and rheology in a library of bio-based succinate polyester polyols

The effect of me‐substituents of 1,4‐butanediol analogues on the thermal properties of biobased polyesters

“…This indicates that the found correlation (increasing T g with increasing number of Me‐groups) might be a universal feature, and that this knowledge could be used to predict T g s for other polyester series. In addition, the same feature is reported for polyesters with 1,3‐propanediol analogues, where an an increase in Me‐groups resulted in an increase in T g …”

“…It is, however, expected that these methyl‐groups should have a profound effect on the crystallization behavior and the glass transition temperature ( T g ) of derived polyesters, and thus could be used to tune polymer properties. This hypothesis is based on previously reported properties for succinate polyesters with 1,3‐propanediol analogues: 1,3‐propanediol (0 × Me): T g = −44 °C, T m = 45 °C; 2‐methyl‐1,3‐propanediol (1 × Me): T g = −31 °C, T m = absent/amorphous; and 2,2‐dimethyl‐1,3‐propanediol (2 × Me): T g = −18 °C, T m = 84 °C …”