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TufFoam™: A TDI-free water-blown polyurethane foam

International SAMPE Technical Conference

Whinnery, LeRoy L.; Goods, Steven H.; Keifer, Patrick N.

TufFoam™ is a TDI-free, water-blown, closed-cell, rigid polyurethane foam (PU) initially formulated as an electronics encapsulant to mitigate the effects of harsh mechanical environments. Because it contains no TDI, the handling hazards and chemical sensitization associated with exposure during processing of common, commercial PU foams are obviated. The mechanical properties of TufFoam™ have been found to be comparable or superior to conventional TDI-based foams. Beyond its original intent, it has since found use in a variety of additional applications, including as a structural material and as a thermal and electrical insulating material. TufFoam™ constituents are commercially available in commodity quantities and batch processing schedules have been developed for its preparation at densities ranging from 0.03 to 0.70 g/cc (2 to 40 pcf). TufFoam™ has a uniform, fine cell structure over the entire range of density explored. Its Tg is somewhat dependant on the cure temperature, but is approximately 127°C when cured at 65°C. The coefficient of thermal expansion (CTE) is 7x10 -5 °C -1. TufFoam™ is electrically insulating with a volume resistivity of 3x10 17 ohm-cm at a density of 0.1 g/cc.

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TYPE Conference YEAR 2006
ScopusOSTI

Protection of alodine coatings from thermal aging by removable polymer coatings

Bradshaw, Robert W.; Wagstaff, Brett W.; Whinnery, LeRoy L.

Removable polymer coatings were evaluated as a means to suppress dehydration of Alodine chromate conversion coatings during thermal aging and thereby retain the corrosion protection afforded by Alodine. Two types of polymer coatings were applied to Alodine-treated panels of aluminum alloys 7075-T73 and 6061-T6 that were subsequently aged for 15 to 50 hours at temperatures between 135 F to 200 F. The corrosion resistance of the thermally aged panels was evaluated, after stripping the polymer coatings, by exposure to a standard salt-fog corrosion test and the extent of pitting of the polymer-coated and untreated panels compared. Removable polymer coatings mitigated the loss of corrosion resistance due to thermal aging experienced by the untreated alloys. An epoxide coating was more effective than a fluorosilicone coating as a dehydration barrier.

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TYPE SAND Report YEAR 2006
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Results 26–33 of 33
Results 26–33 of 33