Spinel is an excellent candidate for HEL windows. Significantly better than glass materials: 3x stronger and harder, 10x higher thermal conductivity, significantly better thermal shock resistance, OPD is comparable to OFG and better Silica, significantly superior environmental ruggedness. Successfully developed rugged, low-loss AR coatings for Spinel. Demonstrated fabrication of a large Spinel window. Availability of high optical quality AR coated Spinel windows will have a significant impact on all DoD ...
This paper presents a report on the design and development of a controlled heat flux combustor in support of a larger task aimed at the development of a sub-scale alternate test protocol to the external fire test currently required for final hazards classification (HC) of an ordnance system. The specific goal of this part of the task was to design a thermal stimulus that could be controlled and still deliver ...
A series of four new end-capped and hydroxymethyl-functionalized polyimides were prepared. Through a two-step chemical modification process 3-aminopropylisobutyl-POSS was covalently attached to the polymer backbone. POSS loading levels as high as 40 wt-% could be obtained while maintaining excellent processability and optical clarity of thin films. Concurrent attachment of either a cyanate ester or hydroxyethyl methacrylate (HEMA) group afforded processable POSS-polyimides that underwent thermal curing to yield solvent resistant films, ...
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