Free Volumes and Grüneisen Parameters in Mixed-Tacticity Polyhydroxybutyrates,Macromolecular Chemistry and Physics

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Free Volumes and Grüneisen Parameters in Mixed-Tacticity Polyhydroxybutyrates
Macromolecular Chemistry and Physics ( IF 2.5 ) Pub Date : 2021-07-02 , DOI: 10.1002/macp.202100087
Daniel Van Opdenbosch ₁ , Moritz Klotz ₁ , Maria Haslböck ₁ , Cordt Zollfrank ₁

Affiliation

Recently, nonlinear progressions of mechanical and thermal properties of mixed-tacticity polyhydroxybutyrates have been discovered with their fraction of meso diads

f_{meso}

. Characteristic

f_{meso}

is traced by a measure

\hat{λ}

of polymer chain segment length disturbance, due to the inclusion of S enantiomers in chains consisting otherwise of R monomers. In this article, the material compositions' thermal expansion coefficients are reported on as determined by X-ray diffraction and connect the qualitative

\hat{λ}

to their free volume fractions. Further, it is demonstrate that the previously determined Einstein oscillator modes correlate to Grüneisen parameters determined for a range of mixed-tacticity polyhydroxybutyrates.

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