Novel behavior in a polymer solution: the disappearance of the melting temperature (Tm) and enthalpy change (ΔHm) of the solvent
Open Access
- 7 August 2020
- journal article
- research article
- Published by Springer Science and Business Media LLC in Scientific Reports
- Vol. 10 (1), 1-11
- https://doi.org/10.1038/s41598-020-70331-4
Abstract
The phase change temperature and enthalpy change as a function of polystyrene (PS) concentration in dimethylformamide through a dynamic heating and quenching process were investigated. Cold crystallization, freezing and melting phenomena in a 10 wt% PS solution were all observed. Cold crystallization and melting phenomena were still observed in a 20 wt% solution. In a 30 wt% solution, all three phenomena disappeared without any solvent enthalpy changes, e.g., enthalpy changes at the melting temperature. The disappearance of both the melting temperature and the melting enthalpy change indicated that all polymer and solvent molecules in the 30 wt% solution existed only in the amorphous phase without any phase changes despite repeated heating and quenching processes. Thus, our results can provide a new approach for gelation through enthalpy changes and can be applied in the fabrication of porous membranes with a narrow distribution.Funding Information
- National Research Foundation of Korea (NRF-2018R1D1A1B07047567)
This publication has 35 references indexed in Scilit:
- Flash freezing route to mesoporous polymer nanofibre networksNature Communications, 2013
- Determination of Solvent–Polymer and Polymer–Polymer Flory–Huggins Interaction Parameters for Poly(3-hexylthiophene) via Solvent Vapor SwellingMacromolecules, 2013
- Macroporous poly(vinylidene fluoride) membrane as a separator for lithium-ion batteries with high charge rate capacityJournal of Power Sources, 2009
- Thermodynamic properties of N,N-dimethylformamide and N,N-dimethylacetamideThe Journal of Chemical Thermodynamics, 2007
- Gelation in Physically Associating Polymer SolutionsPhysical Review Letters, 2001
- Effects of mixed solvent on gelation of poly(vinyl alcohol) solutionsJournal of Applied Polymer Science, 2000
- Thermoreversible Gelation of Aqueous Methylcellulose SolutionsMacromolecules, 1999
- Thermoreversible Gelation in Solutions of Associative Polymers. 1. StaticsMacromolecules, 1998
- Rheological behavior of a hydrophobically associating water soluble polymerJournal of Rheology, 1994
- Thermoreversible gelation of atactic polystyrene solutionsMacromolecules, 1983