Synthesis of Fluorinated Hyperbranched Polymers and Their Use as Additives in Cationic Photopolymerization

Abstract

Summary: A fluorine containing hyperbranched polymer was synthesized by modifying an aromatic‐aliphatic hyperbranched polyester with a semifluorinated alcohol via a Mitsunobu reaction and was subsequently used as an additive in cationic photopolymerization of an epoxy resin. The remaining OH groups of the fluorinated hyperbranched polymer interact with the polymeric carbocation through a chain‐transfer mechanism inducing an increase in the final epoxy conversion. The fluorinated HBP induces modification of bulk and surface properties, with an increase in Tg and surface hydrophobicity already reached at very low concentration. The HBFP additive can, therefore, protect the coatings from aggressive solvents, increases hardness, and allows the preparation of a low energy surface coating.

Hyperbranched Fluoropolymers and their Hybridization into Complex Amphiphilic Crosslinked Copolymer Networks

“…[8] Many examples of fluorocarbon-containing hyperbranched polymers have been reported, for which the fluorocarbon content is either the intentional or unintentional result of the chemistry employed for polymerization [9][10][11][12][13][14][15][16][17][18] or is introduced through subsequent chemical modification. [19,20] As expected, the hyperbranching of fluorocarbon-based polymers increases their solubilities, relative to linear structures, in alignment with the characteristics of highly branched systems. Furthermore, the incorporation of fluorocarbon increases the hydrophobicity and reduces the surface energy, relative to hydrogenated analogs.…”

“…Furthermore, the incorporation of fluorocarbon increases the hydrophobicity and reduces the surface energy, relative to hydrogenated analogs. HBFPs have been studied as materials for optical waveguide applications, [17] as additives in the cationic photopolymerization of epoxy resins, [19] as corrosion inhibiting coatings, [21] and as membranes for gas separation, [22][23][24] among other applications.…”

Dielectric properties of UV-cured epoxy films treated with Layer-by-Layer nanosilica architectures

“…This proves the success of the copolymerization of GTPDMS and HDGE (low T g value of comonomers) with the CE resin [7][8].…”

Hyperbranched Polymers in Cationic UV Curing

“…A phenolic polyester HBP based on based on bis-(4 0 -hydroxyphenyl)pentanoic acid (HBP-OH, Mn ¼ 4000 g/mol, Mw ¼ 5500 g/mol, PD ¼ 1.38), [24] a oxetane functionalized HBP (HBP-OXT, Mn ¼ 1100 g/mol, Mw ¼ 7600 g/mol PD ¼ 9.9), [25] and a fluorinated functionalized HBP (HBPF, Mn ¼ 5100, Mw ¼ 22800, PD ¼ 4.52) [26] were synthesized as elsewhere reported.…”