Variable temperature cure polyetherimide epoxy‐based prepreg systems
Identifieur interne : 000512 ( Main/Exploration ); précédent : 000511; suivant : 000513Variable temperature cure polyetherimide epoxy‐based prepreg systems
Auteurs : Brian S. Hayes [États-Unis] ; James C. Seferis [États-Unis]Source :
- Polymer Engineering & Science [ 0032-3888 ] ; 1998-02.
Abstract
This work identifies the necessary attributes of variable temperature cure epoxybased prepreg systems as they relate to high performance prepreg systems capable for composite repair. Model polyetherimide epoxy blend resins were developed and hot‐melt impregnated into woven carbon fabric and compared with a commercial prepreg system. It was found that when the PEI content was increased from 0 to 14 wt% in the base resin of the prepregs, the GIC and GIIC fracture toughness increased by over 70%. The fracture toughness was found to be similar when the model prepreg was cured at either 121°C or 177°C, a result of only a 9% difference in conversion and complete phase separation of the PEI at both cure temperatures. Void content in vacuum cured laminates were found to decrease as the PEI content was increased because of a large quantity of resin in the interstitial areas between the longitudinal and transverse tows. A comparison of the model and commercial prepreg system demonstrated many similarities and some significant differences. For example, the commercial prepreg had a 15% difference in conversion when cured at 121°C versus 177°C and very little PEI phase separation after both cure cycles. As a result, a significant difference in GIIC for the commercial prepreg was observed for the two cure temperatures.
Url:
DOI: 10.1002/pen.10197
Affiliations:
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Hayes</name><affiliation wicri:level="2"><country xml:lang="fr">États-Unis</country><placeName><region type="state">Washington (État)</region></placeName><wicri:cityArea>University of Washington, Department of Chemical Engineering, Polymeric Composites Laboratory, Seattle</wicri:cityArea></affiliation></author><author><name sortKey="Seferis, James C" sort="Seferis, James C" uniqKey="Seferis J" first="James C." last="Seferis">James C. Seferis</name><affiliation wicri:level="2"><country xml:lang="fr">États-Unis</country><placeName><region type="state">Washington (État)</region></placeName><wicri:cityArea>University of Washington, Department of Chemical Engineering, Polymeric Composites Laboratory, Seattle</wicri:cityArea></affiliation></author></analytic><monogr></monogr><series><title level="j">Polymer Engineering & Science</title><title level="j" type="abbrev">Polym Eng Sci</title><idno type="ISSN">0032-3888</idno><idno type="eISSN">1548-2634</idno><imprint><publisher>Wiley Subscription Services, Inc., A Wiley Company</publisher><pubPlace>Hoboken</pubPlace><date type="published" when="1998-02">1998-02</date><biblScope unit="volume">38</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="357">357</biblScope><biblScope unit="page" to="370">370</biblScope></imprint><idno type="ISSN">0032-3888</idno></series><idno type="istex">CFED60AD15C86E2E9344F6D24790B1493F84B7F7</idno><idno type="DOI">10.1002/pen.10197</idno><idno type="ArticleID">PEN10197</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0032-3888</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">This work identifies the necessary attributes of variable temperature cure epoxybased prepreg systems as they relate to high performance prepreg systems capable for composite repair. Model polyetherimide epoxy blend resins were developed and hot‐melt impregnated into woven carbon fabric and compared with a commercial prepreg system. It was found that when the PEI content was increased from 0 to 14 wt% in the base resin of the prepregs, the GIC and GIIC fracture toughness increased by over 70%. The fracture toughness was found to be similar when the model prepreg was cured at either 121°C or 177°C, a result of only a 9% difference in conversion and complete phase separation of the PEI at both cure temperatures. Void content in vacuum cured laminates were found to decrease as the PEI content was increased because of a large quantity of resin in the interstitial areas between the longitudinal and transverse tows. A comparison of the model and commercial prepreg system demonstrated many similarities and some significant differences. For example, the commercial prepreg had a 15% difference in conversion when cured at 121°C versus 177°C and very little PEI phase separation after both cure cycles. As a result, a significant difference in GIIC for the commercial prepreg was observed for the two cure temperatures.</div></front></TEI><affiliations><list><country><li>États-Unis</li></country><region><li>Washington (État)</li></region></list><tree><country name="États-Unis"><region name="Washington (État)"><name sortKey="Hayes, Brian S" sort="Hayes, Brian S" uniqKey="Hayes B" first="Brian S." last="Hayes">Brian S. Hayes</name></region><name sortKey="Seferis, James C" sort="Seferis, James C" uniqKey="Seferis J" first="James C." last="Seferis">James C. Seferis</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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