| dc.creator |
Ezekiel, N. |
|
| dc.creator |
Ndazi, Bwire S. |
|
| dc.creator |
Nyahumwa, C. |
|
| dc.creator |
Karlsson, S. |
|
| dc.date |
2016-03-11T10:43:55Z |
|
| dc.date |
2016-03-11T10:43:55Z |
|
| dc.date |
2011 |
|
| dc.date.accessioned |
2018-04-18T11:50:08Z |
|
| dc.date.available |
2018-04-18T11:50:08Z |
|
| dc.identifier |
Ezekiel, N., Ndazi, B., Nyahumwa, C. and Karlsson, S., 2011. Effect of temperature and durations of heating on coir fibers. Industrial Crops and Products, 33(3), pp.638-643. |
|
| dc.identifier |
http://hdl.handle.net/123456789/866 |
|
| dc.identifier |
doi:10.1016/j.indcrop.2010.12.030 |
|
| dc.identifier.uri |
http://hdl.handle.net/123456789/10563 |
|
| dc.description |
Biocomposites derived from polymeric resin and lignocellulosic fibers may be processed at temperatures
ranging from 100 ◦C to 230 ◦C for durations of up to 30 min. These processing parameters normally lead
to the degradation of the fiber’s mechanical properties such as Young’s modulus (E), ultimate tensile
strength (UTS) and percentage elongation at break (%EB). In this study, the effect of processing temperature
and duration of heating on the mechanical properties of coir fibers were examined by heating the
fibers in an oven at 150 ◦C and 200 ◦C for 10, 20 and 30 min to simulate processing conditions. Degradation
of mechanical properties was evaluated based on the tensile properties. It was observed that the UTS
and %EB of heat treated fibers decreased by 1.17–44.00% and 15.28–81.93%, respectively, compared to
untreated fibers. However, the stiffness or E of the fibers increased by 6.3–25.0%. Infra red spectroscopy
(FTIR), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM) were used to elucidate
further the influence of chemical, thermal and microstructural degradation on the resulting tensile
properties of the fibers. The main chemical changes observed at 2922, 2851, 1733, 1651, 1460, 1421
and1370 cm−1 absorption bands were attributed to oxidation, dehydration and depolymerization as well
as volatization of the fiber components. These phenomena were also attributed to in the TGA, and in
addition the TGA showed increased thermal stability of the heat treated coir fibers with reference to the
untreated counterparts which was most probably due to increased recrystallization and cross linking.
The microstructural features including microcracks, micropores, collapsed microfibrils and sort of cooled
molten liquid observed on the surface of heat treated coir fibers from the scanning electron microscope
(SEM) could not directly be linked to the effect of temperature and durations of heating although such features
may have largely account for the lower tensile properties of heat treated coir fibers with reference
to untreated ones. |
|
| dc.language |
en |
|
| dc.publisher |
Industrial Crops and Products |
|
| dc.subject |
Coir fiber |
|
| dc.subject |
Temperature |
|
| dc.subject |
Duration of heating |
|
| dc.subject |
Mechanical degradation |
|
| dc.subject |
Thermal degradation |
|
| dc.subject |
Microstructural degradation |
|
| dc.title |
Effect of Temperature and Durations of Heating on Coir Fibers |
|
| dc.type |
Journal Article |
|