The U.S. Naval Research Laboratory (NRL) Chemistry Division and Technology Transfer Office announce a signing of chartering agreements for a blurb production of an NRL-developed PEEK-like phthalonitrile (PN) creosote composition.
Inventors of a protected patents are Teddy M. Keller, Matthew Laskoski, and Andrew P. Saab of a Materials Chemistry Branch in a Chemistry Division. “The many appealing facilities of a second-generation polyetheretherketone PEEK-like phthalonitriles make these resins glorious possibilities for countless troops and domestic applications,” said, Teddy Keller, Ph.D., head, NRL Advanced Materials Section.
“The NRL-developed phthalonitrile-based polymeric composites vaunt higher glow resistant, high temperature, and low H2O fullness properties that do not exist in a stream marketplace.”
Phthalonitrile-based polymers consecrate a category of high heat thermosets that sojourn clever during temperatures adult to 500 degrees Celsius (C) and are simply processed into made fiber reinforced combination components by low-cost non-autoclave techniques. The creosote can be used to make combination components by determined industrial methods such as creosote send frame (RTM), creosote distillate frame (RIM), strand winding, prepreg consolidation, and potentially by programmed combination production techniques such as programmed fasten laying and programmed fiber placement.
NRL’s PEEK-like phthalonitrile resins were also totalled to have glorious dielectric permittivity and detriment tangent characteristics for intensity high heat radomes and other applications requiring radiofrequency transparency. The flexibility of a restorative PN combination can be straightforwardly tranquil as a duty of a restorative addition and heat and a B-staged prepolymer middle can be stored indefinitely underneath ambient condition until prepared to modify to a thermoset polymer or to use in a phony of a combination component.
The ability to heal to a made plain or combination next 200 C and a higher earthy properties relations to other high heat polymers such as polyimides raise a significance of a phthalonitrile system. Due to their low H2O absorption, estimate temperatures allied to common glue resins, and higher thermo-oxidative fortitude during temperatures in additional of 375 C, a second-generation PEEK-like phthalonitrile-based polymers can change a use of composites in applications including lightweight automobiles, ships, oil rigs, aircraft, breeze blades, high heat bearings, valves, battery and electronic casings, glow resistant textiles, robotic and unconstrained firefighting on ships, ammunition casings and storage containers, and fire-resistant building materials.
A important aspect of this second era record is a ability to warp a creosote and to control a initial heal to a made plain next 200 C. This permits NRL’s phthalonitriles to be processed in a same approach as typical blurb resins, regulating customary industrial combination production methods – a critical technological advantage to a aerospace, ship, and other domestic industries.
The oligomeric PEEK-like phthalonitrile is a potion above 70 C and polymerizes to a thermoset occurring above 150 C, giving it an plenty estimate heat window. The rate of polymerization is tranquil as a duty of heat and a volume of restorative additive, and a entirely marinated void-free phthalonitrile polymer does not vaunt a potion transition heat (does not warp or soften) when post-cured to temperatures larger than 375 C. NRL’s phthalonitrile resins/prepolymers or creosote prepregs have an unfixed shelf life but a need for refrigeration.