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Graphene nanoplatelets as novel reinforcement filler in poly(lactic acid)/epoxidized palm oil green nanocomposites: mechanical properties.

Chieng BW, Ibrahim NA, Yunus WM, Hussein MZ, Giita Silverajah VS - Int J Mol Sci (2012)

Bottom Line: PLA/EPO reinforced with xGnP resulted in an increase of up to 26.5% and 60.6% in the tensile strength and elongation at break of the nanocomposites respectively, compared to PLA/EPO blend.However, incorporation of xGnP has no effect on the flexural strength and modulus.Mechanical properties of PLA were greatly improved by the addition of a small amount of graphene nanoplatelets (<1 wt%).

View Article: PubMed Central - PubMed

Affiliation: Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, UPM Serdang, Selangor 43400, Malaysia; E-Mails: mzobir@science.upm.edu.my (M.Z.H.); vsgiita@gmail.com (V.S.G.S.).

ABSTRACT
Graphene nanoplatelet (xGnP) was investigated as a novel reinforcement filler in mechanical properties for poly(lactic acid) (PLA)/epoxidized palm oil (EPO) blend. PLA/EPO/xGnP green nanocomposites were successfully prepared by melt blending method. PLA/EPO reinforced with xGnP resulted in an increase of up to 26.5% and 60.6% in the tensile strength and elongation at break of the nanocomposites respectively, compared to PLA/EPO blend. XRD pattern showed the presence of peak around 26.5° in PLA/EPO nanocomposites which corresponds to characteristic peak of graphene nanoplatelets. However, incorporation of xGnP has no effect on the flexural strength and modulus. Impact strength of PLA/5 wt% EPO improved by 73.6% with the presence of 0.5 wt% xGnP loading. Mechanical properties of PLA were greatly improved by the addition of a small amount of graphene nanoplatelets (<1 wt%).

No MeSH data available.


Impact strength of PLA/5 wt% EPO with various xGnP loadings.
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f11-ijms-13-10920: Impact strength of PLA/5 wt% EPO with various xGnP loadings.

Mentions: Impact test reflects the ability of material absorbing energy at fracture, when exposed to sudden impact. The impact strength of PLA/5 wt% EPO improved by 73.6% with the presence of 0.5 wt% xGnP loading as shown in Figure 11. The impact strength of PLA/5EPO and PLA/5EPO/0.5 wt% xGnP are 276.0 J/m and 479.2 J/m, respectively. It shows around 73.6% increases in impact strength when 0.5 wt% of xGnP was incorporated into PLA/5EPO blend. At lower xGnP content, the impact strength is low. The difference in impact strength may result from the different adhesion between the xGnP sheets and the polymer matrix, as well as the difference in dispersion state in the polymer. Those differences eventually will result in various energy absorbing mechanisms at the impact fracture surface, such as crack branching due to hindrance by reinforcements, bridging of the crack, creation of voids and crazes [31]. However, the adhesion forces between the xGnP and the polymer molecules are of a van der Waals nature, which may not be sufficient magnitude to transfer the stress to xGnP.


Graphene nanoplatelets as novel reinforcement filler in poly(lactic acid)/epoxidized palm oil green nanocomposites: mechanical properties.

Chieng BW, Ibrahim NA, Yunus WM, Hussein MZ, Giita Silverajah VS - Int J Mol Sci (2012)

Impact strength of PLA/5 wt% EPO with various xGnP loadings.
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC3472721&req=5

f11-ijms-13-10920: Impact strength of PLA/5 wt% EPO with various xGnP loadings.
Mentions: Impact test reflects the ability of material absorbing energy at fracture, when exposed to sudden impact. The impact strength of PLA/5 wt% EPO improved by 73.6% with the presence of 0.5 wt% xGnP loading as shown in Figure 11. The impact strength of PLA/5EPO and PLA/5EPO/0.5 wt% xGnP are 276.0 J/m and 479.2 J/m, respectively. It shows around 73.6% increases in impact strength when 0.5 wt% of xGnP was incorporated into PLA/5EPO blend. At lower xGnP content, the impact strength is low. The difference in impact strength may result from the different adhesion between the xGnP sheets and the polymer matrix, as well as the difference in dispersion state in the polymer. Those differences eventually will result in various energy absorbing mechanisms at the impact fracture surface, such as crack branching due to hindrance by reinforcements, bridging of the crack, creation of voids and crazes [31]. However, the adhesion forces between the xGnP and the polymer molecules are of a van der Waals nature, which may not be sufficient magnitude to transfer the stress to xGnP.

Bottom Line: PLA/EPO reinforced with xGnP resulted in an increase of up to 26.5% and 60.6% in the tensile strength and elongation at break of the nanocomposites respectively, compared to PLA/EPO blend.However, incorporation of xGnP has no effect on the flexural strength and modulus.Mechanical properties of PLA were greatly improved by the addition of a small amount of graphene nanoplatelets (<1 wt%).

View Article: PubMed Central - PubMed

Affiliation: Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, UPM Serdang, Selangor 43400, Malaysia; E-Mails: mzobir@science.upm.edu.my (M.Z.H.); vsgiita@gmail.com (V.S.G.S.).

ABSTRACT
Graphene nanoplatelet (xGnP) was investigated as a novel reinforcement filler in mechanical properties for poly(lactic acid) (PLA)/epoxidized palm oil (EPO) blend. PLA/EPO/xGnP green nanocomposites were successfully prepared by melt blending method. PLA/EPO reinforced with xGnP resulted in an increase of up to 26.5% and 60.6% in the tensile strength and elongation at break of the nanocomposites respectively, compared to PLA/EPO blend. XRD pattern showed the presence of peak around 26.5° in PLA/EPO nanocomposites which corresponds to characteristic peak of graphene nanoplatelets. However, incorporation of xGnP has no effect on the flexural strength and modulus. Impact strength of PLA/5 wt% EPO improved by 73.6% with the presence of 0.5 wt% xGnP loading. Mechanical properties of PLA were greatly improved by the addition of a small amount of graphene nanoplatelets (<1 wt%).

No MeSH data available.