New perfluoropolyether soft segment containing polyurethanes

Abstract

New segmented polyurethanes (FPU) with perfluoropolyether (PFPE) blocks have been synthesized by a two‐step process. In the first step, a fluorinated isocyanate end‐capped prepolymer has been obtained by reaction of a fluorinated macrodiol with alicyclic diisocyanates in the presence of solvent. The following chain extension has been carried out by reaction of the prepolymer with short hydrogenated polyols giving a polymeric matrix. Tensile properties, dynamical–mechanical (DMA), and calorimetric (DSC) analyses have been evaluated, and relationships between chemical structure and final properties are established. These polymers show unusual low‐temperature elastomeric behavior, due to the low glass transition (Tg) of the continuous fluorinated phase. In general, with respect to traditional polyurethanes (HPU), thermal stability and chemical resistance are strongly improved by the effect of the highly inert fluorinated chains. © 1995 John Wiley & Sons, Inc.

ToF‐SIMS and XPS surface characterization of novel perfluoropolyether–urethane ionomers from aqueous dispersions

“…1 Di-and monohydroxy-terminated perfluoropolyethers (Fomblin  PFPE, Ausimont) can be used as speciality lubricants 2 for magnetic recording media as well as building blocks 3 for the preparation of macromersegmented copolymers: In particular, copolymerization of PFPE macroalcohols with di-or polyisocyanates such as R-(N C O) x , with x D 2 or 3, leads to polyurethane materials as elastomers 4,5 and coatings. 6,7 A specific study was reported in the recent literature 8 on the spectroscopic and tensiometric characterization of cross-linked solvent-borne PFPE-containing coatings, showing an efficient surface enrichment in fluorine, even in polyphasic three-dimensional networks.…”

Phase behavior and some calorimetric and physical properties of diurethanes from perfluoropolyether macromonomers

“…10 ZDOL has a good reactivity, [11][12][13][14] and it has been used recently to synthesize polyurethanes. [15][16][17] Moreover, several comprehensive physicochemical studies are available on ZDOL and on some derivatives obtained by end capping the PFPE chain with different hydrogenated end groups; 18 -21 their polarity plays an important role in determining some physical properties.…”

Surface-Fluorinated Coatings

“…[14] In another variation these diols are capped with isocyanates or blocked isocyanates and these polyisocyanates are then either moisture cured, or used in formulations with other diols to make fluorinated coatings. [15] …”