Grafen oksit (GO) ve indirgenmiş grafen oksit (RGO) dolgulu PVC kompozitlerin mekanik özelliklerinin karşılaştırılması

Yıl 2019, Cilt: 25 Sayı: 1, 43 - 48, 26.02.2019

Ferda Mindivan

Öz

Grafen
türevleri (grafen oksit-GO, indirgenmiş grafen oksit-RGO, çok tabakalı grafen-MLG
vb.) polimer malzemelerin özelliklerini iyileştirmek için yüksek potansiyele
sahip dolgu maddeleri olarak bilinmektedirler. Bu çalışmada kompozitlerin
mekanik özelliklerinde ki değişim dolgu tipine ve dolgu miktarına göre
incelenmiştir. Kompozitler, dolgu maddeleri olarak GO ve RGO, matriks olarak
polivinil klorür (PVC) ile hazırlanmıştır. X-ışını kırınımı (XRD) sonuçları, GO
ve RGO tabakalarının polimer matriksde homojen dağıldığını göstermiştir.
Taramalı elektron mikroskobu (SEM) çalışmaları, RGO içeren kompozitin düz ve
pürüzsüz, GO içeren kompozitin ise

dolgu- matriks etkileşimi daha iyi olduğu için yüksek oranda gözenekli
morfoloji sergilediklerini ortaya koymuştur. Yüksek GO (ağırlıkça %1) ve düşük
RGO (ağırlıkça %0.1) içeren kompozitlerin mekanik özellikleri önemli bir
iyileşme sergilemiştir. Dolgu maddesi içermeyen PVC’ye nazaran ağırlıkça %1 GO
ve %0.1 RGO içeren kompozitlerin çekme mukavemetleri sırasıyla %84 ve %42
artmıştır. RGO ilavesi kompozit yapıyı rijitleştirdiğinden, RGO içeren kompozitler
GO içeren kompozitlere kıyasla daha yüksek mikrosertlik ve daha düşük yüzde
uzama değerleri sergilemişlerdir.

Anahtar Kelimeler

Grafen oksit (GO), İndirgenmiş grafen oksit (RGO), PVC kompozit, Mekanik özellikler

A comparison study on mechanical properties of PVC composites filled by graphene oxide (GO) and reduced graphene oxide (RGO)

Öz

Graphene
derivatives (graphene oxide-GO, reduced graphene oxide-RGO, multi-layer
grapheme-MLG, etc.) generally are considered to be extremely significant
fillers to improve properties of polymer materials. In this work, the
mechanical properties of the composites according to filler type and filler
loading were investigated. The composites were prepared using GO, RGO as the
fillers and polyvinyl chloride (PVC) as a matrix. The X-ray diffraction (XRD)
studies on the composites showed that the GO and RGO layers well-dispersed in
polymer matrix. The scanning electron microscopy (SEM) showed that the
composite with RGO exhibited smooth and clean surfaces, but the surface images
of the composite with GO showed highly porous morphology because of the good
filler-matrix interaction. The composites at a high GO loading

(1% wt.) and a low RGO loading (0.1% wt.) indicated a prominent improvement in
the mechanical properties. When compared the unfilled PVC, the tensile strength
of the composite with 1 wt.% loading of the GO and 0.1 wt.% loading of the RGO
increased by 84% and 42%, respectively. The composite with RGO showed a higher
microhardness value compared to that of the composite with GO, but the
elongation at break of the composite with RGO decreased because RGO loading
increased the brittleness of composite structure.

Anahtar Kelimeler

Graphene oxide (GO), Reduced graphene oxide (RGO), PVC composite, Mechanical properties

Kaynakça

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