Magnetic and electromagnetic evaluation of the iron nanoparticle filled polyurethane nanocomposites

The magnetic and electromagnetic wave absorption behavior of a flexible ironnanoparticle reinforced polyurethane nanocomposite is reported. Surface-initiatedpolymerization (SIP) method was utilized to fabricate high quality nanocomposites with uniform particle distribution and tunable particle loading (up to 65 wt.%). The enhancement of coercive force is observed when the nanoparticles are embedded into the polymer matrix Electromagnetic wave absorption performance at a discrete frequency as studied by metal-backed reflection loss indicates that the SIP nanocomposites can save the weight up to 50% compared to the composite counterpart with micron-size particles. Report Documentation Page Form Approved OMB No. 0704-0188 Public reporting burden for the collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to a penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. 1. REPORT DATE 01 MAY 2007 2. REPORT TYPE N/A 3. DATES COVERED 4. TITLE AND SUBTITLE Magnetic and electromagnetic evaluation of the iron nanoparticle filled polyurethane nanocomposites 5a. CONTRACT NUMBER