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Characterization of Hybrid Epoxy Nanocomposites

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ABSTRACT

This study focused on the effect of Multi Wall Carbon Nanotubes (MWCNT) content and its surface treatment on thermo-mechanical properties of epoxy nanocomposites. MWCNTs were surface treated and incorporated into two epoxy systems. MWCNT's surface treatments were based on: (a) Titania coating obtained by sol-gel process and (b) a nonionic surfactant. Thermo-mechanical properties improvement was obtained following incorporation of treated MWCNT. It was noticed that small amounts of titania coated MWCNT (0.05 wt %) led to an increase in the glass transition temperature and stiffness. The best performance was achieved adding 0.3 wt % titania coated MWCNT where an increase of 10 °C in the glass transition temperature and 30% in storage modulus were obtained.

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Effect of MWCNT content on thermo-mechanical properties of nanocomposites (Epoxy system 1).
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nanomaterials-02-00348-f002: Effect of MWCNT content on thermo-mechanical properties of nanocomposites (Epoxy system 1).

Mentions: Thermo-mechanical properties of Epon 828/Jeffamine T-403 nanocomposites are depicted in Table 6 and Figure 2. It can be seen that addition of treated MWCNTs caused a higher crosslink density compared to neat resin, as could be noticed by the increase of approximately 10% in the Tg of the nanocomposites. Furthermore, treated MWCNT induced an increase in thermal stability of nanocomposites in the rubbery state of storage modulus (Figure 3 b,e). According to Ma et al. [36] this behavior can be explained in terms of interfacial bonding. The improved interfacial bonding reduces the mobility of the matrix around the MWCNT, increasing thermal stability at elevated temperatures. Simultaneous increase of approximately10% in storage modulus and Tg can be seen for 0.05 wt % titania coated MWCNT and 0.3 wt % Triton X-100 MWCNT. Nanocomposites containing titania coated MWCNT showed the best thermo-mechanical properties. This finding can be due to the hydrophilic and polar nature of titania. Another explanation can be the possible chemical reaction between OH groups known present on CNTs surface and titanium precursor molecules [42]. It should be mentioned that the addition of treated MWCNT did not lead to toughening effects.


Characterization of Hybrid Epoxy Nanocomposites
Effect of MWCNT content on thermo-mechanical properties of nanocomposites (Epoxy system 1).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5304600&req=5

nanomaterials-02-00348-f002: Effect of MWCNT content on thermo-mechanical properties of nanocomposites (Epoxy system 1).
Mentions: Thermo-mechanical properties of Epon 828/Jeffamine T-403 nanocomposites are depicted in Table 6 and Figure 2. It can be seen that addition of treated MWCNTs caused a higher crosslink density compared to neat resin, as could be noticed by the increase of approximately 10% in the Tg of the nanocomposites. Furthermore, treated MWCNT induced an increase in thermal stability of nanocomposites in the rubbery state of storage modulus (Figure 3 b,e). According to Ma et al. [36] this behavior can be explained in terms of interfacial bonding. The improved interfacial bonding reduces the mobility of the matrix around the MWCNT, increasing thermal stability at elevated temperatures. Simultaneous increase of approximately10% in storage modulus and Tg can be seen for 0.05 wt % titania coated MWCNT and 0.3 wt % Triton X-100 MWCNT. Nanocomposites containing titania coated MWCNT showed the best thermo-mechanical properties. This finding can be due to the hydrophilic and polar nature of titania. Another explanation can be the possible chemical reaction between OH groups known present on CNTs surface and titanium precursor molecules [42]. It should be mentioned that the addition of treated MWCNT did not lead to toughening effects.

View Article: PubMed Central - PubMed

ABSTRACT

This study focused on the effect of Multi Wall Carbon Nanotubes (MWCNT) content and its surface treatment on thermo-mechanical properties of epoxy nanocomposites. MWCNTs were surface treated and incorporated into two epoxy systems. MWCNT's surface treatments were based on: (a) Titania coating obtained by sol-gel process and (b) a nonionic surfactant. Thermo-mechanical properties improvement was obtained following incorporation of treated MWCNT. It was noticed that small amounts of titania coated MWCNT (0.05 wt %) led to an increase in the glass transition temperature and stiffness. The best performance was achieved adding 0.3 wt % titania coated MWCNT where an increase of 10 °C in the glass transition temperature and 30% in storage modulus were obtained.

No MeSH data available.