Ti3AlC2/Ti3C2 Katkılanmış Epoksi Kompozitlerinin Üretimi

Epoksi reçineler, iyi elektrik yalıtımı, yüksek yapışkanlık ve mekanik mukavemet gibi üstün özellikleri sayesinde endüstride geniş bir uygulama yelpazesinde yaygın olarak kullanılmaktadır. Orta derecede viskoziteye ve 200 °C' nin altında kür sıcaklığına sahiptirler. Böylece elektronik, havacılık ve denizcilik endüstrilerinde koruyucu kaplamalar için ideal adaylardır. Epoksinin üstün özelliklerini yüksek mekanik mukavemet ile birleştirerek yapısal uygulamalarda kullanabilmek için killer ve grafit gibi çeşitli nanomalzemeler ile desteklenmiştir. Bununla birlikte, nano-boyutlu yapıların aşırı topaklanması nedeniyle mekanik özellikler ve ısıl dayanımında yeterli artış sağlanamamıştır. Topaklanma parçacıkların monomer tarafından ıslatılabilirliğini sınırlandırarak polimer matris ile destek parçacıkları ara yüzünde polimerleşme verimini düşürmüştür. Bu çalışmada, Ti3AlC2 (MAX 312) yapısında bulunan alüminyum (Al) tabakası dağlanarak grafen benzeri iletkenliğe sahip 2-boyutlu Ti3C2 tabakaları (MXene) elde edilmiştir. Her iki yapı, MAX ve MXene, eşit oranlarda epoksi monomerine katkılanarak polimerleştirilmiştir. mL- (çok tabakalı) MXene katkılanan numunelerin XRD analizlerinde (002) pikinin kaybolduğu görülmüştür. Bu durum, MXene tabakalarının delamine olduğunun göstergesidir. Ağ. %4 oranında MAX ve MXene katkılandığında epoksinin cam geçiş sıcaklığı (Tg) 173 C'den sırasıyla 180 ve183 C’ye yükselmiştir. Ağ. %4 oranında MXene katkılandığında epoksi mikrosertliği 18,9  1,8 HV’den 27,5  5 HV’e, Ağ. %4 oranında MAX katkılandığında ise 20,6  2,9 HV’e yükselmiştir. Bu çalışma topaklanmanın önlenerek, yüksek katkılı MXene/epoksi kompozitlerinin üretilebileceğini ve yapısal uygulamalarda kullanılabileceğini göstermektedir.

PRODUCTION AND STRUCTURAL ANALYSIS OF Ti3AlC2/Ti3C2 INCORPORATED EPOXY COMPOSITES

Epoxy resins have been extensively used in a wide range of industrial applications owing totheir superior properties like good electrical insulation, adhesiveness and high mechanical strength. Theyhave moderate viscosity and curing temperatures lower than 200 °C, thus have been ideal candidates forprotective coatings in electronic, aerospace and marine industries. In order to combine superior propertiesof epoxy with enhanced mechanical strength for bulk, structural applications, various nanomaterialsincluding clays and graphite have been incorporated into epoxy resins. However, sufficient level ofenhancement in mechanical strength and thermal resistance could not be provided due to excessiveagglomeration of nanosized particles. Agglomeration limited the wettability of particles by the monomer,leading to decreased polymerization efficiency at the polymer-reinforcer interface. In this study, thealuminum layer in Ti3AlC2 (MAX (312); ternary carbides), was chemically etched leaving a layeredstructure possessing graphene-like electrical conductivity (Ti3C2) with good mechanical strength. Both,MAX and MXene were incorporated into epoxy monomer at identical ratios. The incorporation of Ti3C2layers resulted in disappearance of (002) peak in XRD analysis. This indicated the delamination of MXenelayers inside epoxy matrix. The glass transition temperature (Tg) of epoxy shifted from 175 to 180 C and183 C by 4 wt. % incorporation of MAX and MXene respectively. The microhardness increased from 18.9 1.8 to 27.5  5 when 4 wt. % MXene, and to 20.6  2.9 when 4 wt. % MAX incorporated. This studyindicates that it is possible to produce highly reinforced MXene/epoxy composites and use them instructural applications while the agglomeration is prevented.

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