The mouthguard includes a trough which is channel shaped in transverse cross section and a moldable upper fill which extends higher than the channel at least at the front, rear and buccal walls of the trough. The fill comprises a low softening temperature thermoplastic such as a suitable EVA and the trough is formed of a higher softening temperature thermoplastic. The mouthguard is suitable for do-it-yourself custom molding and is heated by emersion in water to a glass transition temperature which is below boiling temperature, e. The mouthguard is then inserted into the mouth, and centered against the teeth of the maxillary arch. The user then bites, causing the fill to extrude over the labial and buccal front, sides and rear of the trough as the fill conforms to the impression of the upper teeth.
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Lin, J. Connell, K. Watson, Jr. Smith, Y. Sun, S. Ghose and D. Working Get PDF 2 MB Abstract To reduce weight and increase the mobility, comfort, and performance of future spacesuits, flexible, thermally conductive fabrics and plastic tubes are needed for the Liquid Cooling and Ventilation Garment.
Such improvements would allow astronauts to operate more efficiently and safely for extended extravehicular activities. As an approach to raise the thermal conductivity TC of an ethylene vinyl acetate copolymer Elvax , it was compounded with three types of carbon based nanofillers: multi-walled carbon nanotubes MWCNTs , vapor grown carbon nanofibers CNFs , and expanded graphite EG.
In addition, other nanofillers including metallized CNFs, nickel nanostrands, boron nitride, and powdered aluminum were also compounded with Elvax in the melt at various loading levels.
In an attempt to improve compatibility between Elvax and the nanofillers, MWCNTs and EG were modified by surface coating and through noncovalent and covalent attachment of organic molecules containing alkyl groups. Ribbons of the nanocomposites were extruded to form samples in which the nanofillers were aligned in the direction of flow.
Samples were also fabricated by compression molding to yield nanocomposites in which the nanofillers were randomly oriented. Mechanical properties of the aligned samples were determined by tensile testing while the degree of dispersion and alignment of nanoparticles were investigated using high-resolution scanning electron microscopy.
TC measurements were performed using a laser flash Nanoflash technique. TC of the samples was measured in the direction of, and perpendicular to, the alignment direction. Additionally, tubing was also extruded from select nanocomposite compositions and the TC and mechanical flexibility measured Topics: Nonmetallic Materials.
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