Thermo-reversible self-healing in a fluorous crosslinked copolymer. Issue 23 (29th May 2018)

• Record Type: Journal Article
• Authors: Padhan, Anil K.; Mandal, Debaprasad
• Is Part Of: Polymer chemistry. Volume 9:Issue 23(2018)
• Page Start: 3248
• Page End: 3261
• Publication Date: 2018-05-29
• Subjects: Polymers -- Periodicals; Macromolecules -- Periodicals; Polymerization -- Periodicals; 547.705
• DOI: 10.1039/c8py00471d
• Languages: English
• ISSNs: 1759-9954

Abstract

Abstract : Self-healing in a fluorous copolymer material enhances its safety index and extends its working lifetime. Abstract : Thermo-reversible self-healing of a partially fluorinated crosslinked polymer was achieved by utilizing reversible Diels–Alder (DA) chemistry. Copolymers (PHFBA- co -PFMA) of perfluorobutyl acrylate (HFBA) and furfurylmethacrylate (FMA) with controlled stoichiometric ratios were synthesized by microwave-assisted radical polymerization by controlling the individual components. The microstructures and stoichiometries of these copolymers of PHFBA and PFMA were analyzed by 1 H, 19 F, 13 C, and DOSY NMR spectroscopy and their molecular weights were analyzed by GPC. The glass transitions ( T g ) of the different stoichiometric copolymers correlate well with the estimated T g values from the Fox equation. A thermo-reversible crosslinked polymer network was achieved via Diels–Alder (DA) and retro-DA reactions between the furan moiety of the copolymer (PHFBA- co -PFMA) and bismaleimide; the self-healing ability of this network was investigated using 1 H NMR, DSC and solution experiments. The self-healing process and recovery of the crosslinked polymers was screened by microscopic visualization and stress–strain tensile studies. The surface properties of the fluorous copolymers and crosslinked polymers were studied by water contact angle measurements, and their mechanical properties were investigated by nanoindentation and DMA.