I am working on polymer, i want to make film of PVDF so i made solution at 65 degree but it turns into gel when left for sometime at room temperature in open atmosphere. i am using DMF as solvent. what could be the reason of this gel formation also the film is not transparent as it should be. it is white in color?
Anshika Passi
Gels are formed with a solvent due to significant intermolecular interactions at a certain concentration of polymer and solvent. If you reduce the concentration of the polymer, the gel will disappear. For concentrations, it will be useful for you to read the article
Article Influence of the Solvent Evaporation Rate on the Crystalline...
Dear Anshika Passi, if you want to work with high concentrations, other alternative solvents and fruitful information in the following RG thread dealing with a similar question. My Regards
https://www.researchgate.net/post/Hello_I_want_to_dissolve_PVDF_and_i_read_that_DMF_is_a_good_solvent_of_PVDFIs_there_any_specific_procedure_temperature_time_etc
The gel formation of PVDF solution in DMF at room temperature is likely due to increased polymer concentration from solvent evaporation, leading to entanglement and phase separation. The film's opacity may result from crystallinity or residual DMF, affecting transparency; optimizing concentration and dissolution conditions can help achieve clearer films.
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