Porous Space-filling Monolithic Polyvinylidene Difluoride (PVDF) Materials by Thermally Induced Phase Separation
(English)In: Polymer, ISSN 0032-3861, E-ISSN 1873-2291Article in journal (Refereed) Submitted
Thermally induced phase separation was assessed as a means of producing space-filling monoliths from PVDF of three different molecular weights in twenty-two different solvents spanning a wide polarity range. Monolithic materials were produced in six out of these solvents; n-butyl butyrate, 1,4-dimethoxybenzene, cyclohexanone, 2,5-hexanedione, dimethyl succinate, and e-caprolactone. These monoliths had specific surface areas up to 35 m2/g, with the majority of the measured surface area attributable to pores in the mesoporous region from 5-20 nm, depending on solvent. Scanning electron microscopy images revealed radically different structures at the macropore level. In three of the samples essentially monodisperse particles in the 4-5 µm diameter range were found and verified to be of the same chemical composition as the monolithic part of the precipitate. These particles appeared for PVDF of different molecular weights and seem to have phase separated by a mechanism differing from the bulk monolith, which could hint at a novel way to prepare monodisperse PVDF particles.
Research subject Analytical Chemistry
IdentifiersURN: urn:nbn:se:umu:diva-89308OAI: oai:DiVA.org:umu-89308DiVA: diva2:719779
FunderSwedish Research Council, 2012-4000