首页|Fluorinated semi-interpenetrating polymer networks for enhancing the mechanical performance and storage stability of polymer-bonded explosives by controlling curing and phase separation rates
Fluorinated semi-interpenetrating polymer networks for enhancing the mechanical performance and storage stability of polymer-bonded explosives by controlling curing and phase separation rates
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Herein,the effect of fluoropolymer binders on the properties of polymer-bonded explosives(PBXs)was comprehensively investigated.To this end,fluorinated semi-interpenetrating polymer networks(semi-IPNs)were prepared using different catalyst amounts(denoted as F23-CLF-30-D).The involved curing and phase separation processes were monitored using Fourier-transform infrared spectroscopy,differ-ential scanning calorimetry,a haze meter and a rheometer.Curing rate constant and activation energy were calculated using a theoretical model and numerical method,respectively.Results revealed that owing to its co-continuous micro-phase separation structure,the F23-CLF-30-D3 semi-IPN exhibited considerably higher tensile strength and elongation at break than pure fluororubber F2314 and the F23-CLF-30-DO semi-IPN because the phase separation and curing rates matched in the initial stage of curing.An arc Brazilian test revealed that F23-CLF-30-D-based composites used as mock materials for PBXs exhibited excellent mechanical performance and storage stability.Thus,the matched curing and phase separation rates play a crucial role during the fabrication of high-performance semi-IPNs;these factors can be feasibly controlled using an appropriate catalyst amount.
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