Accession Number : ADA577758


Title :   Healable Composites


Descriptive Note : Final rept. 15 Jun 2008-14 Dec 2011


Corporate Author : CALIFORNIA UNIV SAN DIEGO LA JOLLA OFFICE OF CONTRACT AND GRANT ADMINISTRATION


Personal Author(s) : Nemat-Nasser, Sia


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a577758.pdf


Report Date : 28 Mar 2012


Pagination or Media Count : 38


Abstract : This research on healable polymers and composites has led to the development of experimental and computational characterization tools, novel fabrication methods, and collaborative partnerships with other researchers. We worked to synthesize the monomers necessary to create the healable polymer. A new synthesis route was identified and implemented for producing the furan monomer, 4FS. The new route is faster and has a higher yield than the previous method. Tens of grams of both monomers (4FS and 2MEP) were produced at higher purities than during previous work at CEAM. Polymerizing the two monomers creates the healable polymer 2MEP4FS. The presence of the thermally reversible Diels-Alder cross-linking adducts in this polymer was confirmed using differential scanning calorimetry (DSC). The polymer was tested with dynamic mechanical analysis (DMA) and exhibited a small increase in the storage modulus and glass transition temperature over previous 2MEP4FS results. A new monomer, 3FT, was also developed in an effort to increase the glass transition temperature of the healable polymer, but no thermally reversible reactions.


Descriptors :   *POLYMERS , COMPOSITE MATERIALS , MONOMERS , SYNTHESIS(CHEMISTRY)


Subject Categories : Polymer Chemistry
      Laminates and Composite Materials


Distribution Statement : APPROVED FOR PUBLIC RELEASE