Abstract
ABSTRACTFluorinated hydroxy‐terminated polybutadiene (F‐HTPB) urethane binders were prepared by the incorporation of a perfluoropolyether (PFPE) diol (Fluorolink E10H (FL)) as a terpolymer system. Rheology measurements at 25°C showed a steady decrease in viscosity with increased cure rates at the gelation time with increasing molar loadings of FL. The optimized F‐HTPB urethane binder was then formulated with fluorinated silica particles (F‐SP) that were successfully modified with a monolayer of perfluoropolyether bound carboxylic acids using Krytox 157 FSH. Loadings up to 20 wt% F‐SPs were prepared with no phase separation demonstrating the interfacial compatibility of the fluorine‐rich PFPE domains of the binder and the silica particle surface while lowering the viscosity at full cure. These rheology measurements suggest the fluorinated binder composite formulations would advance their application as practical drop‐in feed stocks for reactive in situ additive manufacturing techniques at room temperature. This work also includes comprehensive analysis of the particles and composite formulations to include infrared spectroscopy, surface wettability measurements, calorimetry, and thermal gravimetric decomposition analysis.
Published Version
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