A Nanocomposite that Can Best Lexan in Tranparent Armor Properties

In 1996 Shell Chemical discovered a set of tough copolymers of CBDO monomer. These materials have Tg¡s to 205¢XC and notched Izod impact strengths over 1000 Joules/meter (Lexan: 128 J/m). CBDO copolymers are optically transparent, with a yellowing index less than Lexan. It is the impact strength of these materials that make them uniquely suited to use in transparent armor, and that will allow for reductions in thickness and weight. Using molecular modeling CBDO copolymer nanocomposites will be designed and subsequently fabricated in the laboratory. By forming nanocomposites of CBDO copolymers and tailoring the CBDO:PDO ratio, ballistic resistant sheet will be produced. The sheet will be formed into laminates containing an EMI resistant layer with 30¡V80 dB spectral attenuation. Base Phase I laminates will withstand National Institute of Justice (NIJ) level IIA firings, and achieve level IIIA (most powerful 9 mm weapons) in the Option period. Phase I culminates with certified NIJ IIIA testing at H.P. White Labs. A transparent armor company is teamed to provide test services, laminate design assistance, marketing input, and a potential commercial buyer of sheet format transparent CBDO copolymer nanocomposites. During the patent transfer to SMRC subcontractor SWT, Shell estimated CBDO copolymer cost $1/lb.