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dc.contributor.authorKalista, Jr., Stephen Jamesen_US
dc.date.accessioned2004-03-04en_US
dc.date.accessioned2014-03-14T20:50:02Z
dc.date.available2004-03-04en_US
dc.date.available2014-03-14T20:50:02Z
dc.date.issued2003-09-01en_US
dc.date.submitted2003-12-16en_US
dc.identifier.otheretd-12162003-103411en_US
dc.identifier.urihttp://hdl.handle.net/10919/36186
dc.description.abstractPoly(ethylene-co-methacrylic acid) (EMAA) ionomer polymers carry great potential for use in a wide variety of unique applications due to their property of "self-healing" following projectile impact. Following puncture, certain films based on these materials are observed to "heal", with the penetration opening recovering to an air-tight condition. Specifically, four polymers of this class were examined, including DuPont⠢ Surlyn® 8920, Surlyn® 8940, Nucrel® 925, and Nucrel® 960. Though these differ in their amount of ionic content, all expressed a certain degree of self-healing. Thin films were prepared by a compression molding process and punctured at temperatures ranging from room up to that of the melt using a pellet gun. Samples were then assessed for self-healing. A quantitative post-puncture burst-test method examined the strength or quality of the healed site in the four examples. A comparison of this data provided an understanding of the importance of ionic content and the mechanism of puncture healing. Additional damage modes were also examined to determine other cases where healing occurs and the requirements necessary to elicit the healing response. In addition, interesting composite materials consisting of carbon nanotube filled ionomers were fabricated by a melt-mixing process which produced potentially self-healing composites with superior mechanical properties. By comparing peel testing, projectile testing, the quantitative healed strength, and other characteristics, it was determined that healing is not a function of the ionic content of the materials involved. Further, healing was determined to occur due to a synergy of thermomechanical properties facilitated by the addition of the methacrylic acid groups to the polymer backbone.en_US
dc.publisherVirginia Techen_US
dc.relation.haspartThesis_Kalista.pdfen_US
dc.rightsI hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to Virginia Tech or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.en_US
dc.subjectthermoplasticen_US
dc.subjectEMAAen_US
dc.subjectmulti-wall carbon nanotubesen_US
dc.subjectionomeren_US
dc.subjectself-healingen_US
dc.subjectpuncture reversalen_US
dc.titleSelf-Healing of Thermoplastic Poly(Ethylene-co-Methacrylic Acid) Copolymers Following Projectile Punctureen_US
dc.typethesisen_US
dc.contributor.departmentEngineering Science and Mechanicsen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
dc.contributor.committeechairWard, Thomas C.en_US
dc.contributor.committeememberLove, Brian J.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-12162003-103411/en_US
dc.contributor.committeecochairLesko, John J.en_US


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