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1、石墨/酚醛樹脂復(fù)合材料雙極板1陳惠,劉洪波,夏笑虹,楊麗,何月德(湖南大學(xué)材料科學(xué)與工程學(xué)院,長沙,410082)摘要:采用模壓熱固化二步法,以酚醛樹脂為粘結(jié)劑、天然鱗片石墨為導(dǎo)電骨料、炭黑為添加劑制備質(zhì)子交換膜燃料電池用的復(fù)合材料雙極板。系統(tǒng)地研究了不同種類石墨對石墨/酚醛樹脂復(fù)合材料電性能和抗彎強(qiáng)度的影響。結(jié)果表明,天然鱗片石墨為導(dǎo)電原料時(shí),所制備的石墨/酚醛樹脂雙極板的性能最好。實(shí)驗(yàn)結(jié)果還表明:添加導(dǎo)電炭黑能有效地提高石墨/酚醛樹脂復(fù)合材料的電導(dǎo)率;在復(fù)合材料制備中加入4wt%的碳纖維,碳纖維-石墨/酚醛樹脂復(fù)合材料的抗
2、彎強(qiáng)度提高了29%,碳纖維表面液相氧化處理能有效提高纖維與基體間的結(jié)合強(qiáng)度,隨著處理時(shí)間的延長與處理溫度的升高,碳纖維-石墨/酚醛樹脂復(fù)合材料的電導(dǎo)率和抗彎強(qiáng)度都有很大程度的提高;最終固化溫度主要影響酚醛樹脂的交聯(lián)程度,隨著最終溫度的升高,酚醛樹脂的交聯(lián)程度增加,電導(dǎo)率增大,但抗彎強(qiáng)度有一定程度的減小。關(guān)鍵詞:燃料電池;雙極板;復(fù)合材料;天然石墨;聚合物;電導(dǎo)率;抗彎強(qiáng)度中圖分類號:TB331,TB332文獻(xiàn)標(biāo)志碼:AGraphite/resincompositebipolarplateCHENHui,LIUHongbo,XI
3、AXiaohong,YANGLi,HEYuede(MaterialsscienceandengineeringcollegeofHunanuniversity,,Changsha410082)Abstract:Thecompositebipolarplateforprotonexchangemembranefuelcell,resinasabinder,naturalgraphiteastheconductiveaggregate,carbonblackasadditive,usedthemoldingandthermoset
4、tingtwo-stepmethod.Theeffectsofgraphitespeciesontheconductivepropertiesandtheflexuralstrengthofthegraphite/resincompositeswereinvestigatedandanalyzedsystematically.Theresultsshowthattherewillbethebestperformancewhenthenaturalflakegraphitewasusedasconductiverawmateri
5、al.Theelectricalconductivityofthegraphite/resincompositescaneffectivelybeimprovedifconductivecarbonblack(CB)isadded.Inthepreparationofgraphite/resincomposites,ifadding4wt%carbonfiber,theflexuralstrengthofthecarbonfiber-graphite/resincompositesbipolarplatesisimproved
6、by29%.Theliquidphaseoxidationprocessingofcarbonfibersurfacecaneffectivelyimprovethebondingstrengthbetweenthefibersandmatrix.Withtheextendingprocessingtimeandelevatingprocessingtemperature,flexuralstrengthandelectricalconductivityofcompositesaregreatlyimproved.Thefin
7、alcuringtemperaturemainlyaffectesthecross-linkingdegreeofresins.Withhigherfinaltemperature,resincrosslinkingdegreegetsincreased,andtheconductivityincreaseswhileflexuralstrengthdecreases.Keywords:fuelcells;bipolarplates;composite;graphite;polymers;electricalconductiv
8、ity;flexuralstrength收到初稿日期:2014-06-10;錄用日期:2014-07-18;網(wǎng)絡(luò)出版時(shí)間:2014-08-2716:02網(wǎng)絡(luò)出版地址:http://www.cnki.net/kcms/detail/11.1801.TB.20140827.160