Bogoeva-Gaceva, Gordana and Dimeski, Dimko and Srebrenkoska, Vineta (2012) Poly(lactic acid) /kenaf fiber composites: effect of microfibrillated cellulose on interface-sensitive properties. Proceedings of the XXII International Congress of Chemists and Technologists of Macedonia.
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Abstract
Ecologically friendly composites consist of a biodegradable matrix and natural fibers (such as cotton, sisal,
kenaf, bamboo, etc.), which have been successfully used for reinforcing of different polymer matrices. Quite
recently, poly(lactic acid) (PLA) was used as a matrix for biodegradable eco-composites.
Natural fibers (NFs) offer both cost savings and a reduction in density when compared to glass fibers.
Though the strength of NFs is not as great as glass, the specific properties are comparable.
One of the most undesirable properties of NFs is their dimensional instability due to the swelling caused by
moisture absorption. However, a strong fiber/matrix interfacial adhesion can help to diminish the water
penetration, avoiding the worsening of mechanical performances of composites exposed to humid
conditions.
According to the literature, kenaf fibers exhibit higher strength values in terms of tensile and flexural
properties, as compared to other NFs, when reinforcing PLA.
The aim of this work was to study the mechanical behavior of PLLA-based composites reinforced with kenaf
fibers, and the influence of micro-fibrillated cellulose (MFC) on overall composite properties.
Composites of PLLA and kenaf fibers were prepared by melt mixing the components in a Rheocord
apparatus, and consequent compression molding at 180 oC for 3 min at 50 MPa. The amount of MFC in the
mixture was varied from 5-15 %, while the content of PLLA was kept constant, 50%.
The results have shown that the addition of MFC influence the interface sensitive properties of PLLA/kenaf
fiber composites, increasing the interfacial energy release rate for about 20% at MFC loading of 10%.
Flexural strength and modulus of the composites were also improved by the presence of MFC, reaching
values of 57 MPa and 5.9 GPa, corresondingly.
| Item Type: | Article |
|---|---|
| Subjects: | Engineering and Technology > Materials engineering |
| Divisions: | Faculty of Technology |
| Depositing User: | Vineta Srebrenkoska |
| Date Deposited: | 03 Dec 2012 12:59 |
| Last Modified: | 07 Aug 2015 11:11 |
| URI: | https://eprints.ugd.edu.mk/id/eprint/2825 |
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