Thermoreversible Gelation of Poly(vinylidene fluoride-co-chlorotrifluoroethylene): Structure, Morphology, Thermodynamics, and Theoretical Prediction

Autor:	Biswajit Maiti, Pralay Maiti, P. U. Sastry, Aniket Patra, Vinod K. Aswal, Binay K. Ghorai, P. Jaya Prakash Yadav
Rok vydání:	2011
Předmět:	Morphology (linguistics) Polymers and Plastics Organic Chemistry Kinetics Inorganic Chemistry Solvent chemistry.chemical_compound chemistry Polymer chemistry Materials Chemistry Copolymer Fourier transform infrared spectroscopy Solvent effects Chlorotrifluoroethylene Fluoride
Zdroj:	Macromolecules. 44:3029-3038
ISSN:	1520-5835 0024-9297
DOI:	10.1021/ma200271j
Popis:	Thermoreversible gelation of a copolymer, poly(vinylidene fluoride-co-chlorotrifluoroethylene), has been studied in a series of aromatic diesters (phthalates) with varying aliphatic chain length, n. The gelation rate gradually increases with increasing n, but no gelation occurs in dioctyl phthalate (n = 8), giving rise to a solvent dependency. Structures of gels and dried gels have been studied through X-ray diffraction and FTIR studies. Fibrillar morphology is evident for the series of solvents, but its dimension (both lateral and diameter) systematically changes with n. Solvent retention power of gels has gradually been increased with increasing n while the thermal degradation of copolymer occurs at same temperature, reflecting varying interactions between copolymer and various aliphatic chain length phthalates in gels. Phase diagrams of the gels exhibit the formation of two kinds of polymer−solvent complexes and have been predicted theoretically through electronic structure calculation. Both the small-...
Databáze:	OpenAIRE
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