Ubiquitous hydroxyl end groups and high branching densities lend hyperbranched polyesters based on 2,2-bis(hydroxymethyl)propionic acid (bis-MPA) applications ranging from biodegradable drug carriers and nanocomposites to additives in coatings. The origins of hydrogen bond driven structural ordering in the second and fourth generations was explored. Positron annihilation lifetime spectroscopy yielded average-hole free volume while pressure-volume-temperature dilatometry obtained total specific volume, total free volume, occupied volume, and thermal expansion. Rheological data showed a viscosity build-up and also yielded free volume parameters.

Thermodynamic and volumetric comparison of second and fourth generation bis-MPA based hydroxylated hyperbranched polyesters: Free volume and structural ordering

245th National Meeting (2013)

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