Structural characterization and tensile properties of Borassus fruit fibers

Abstract

The chemical and instrumental analysis of alkali-treated Borassus fibers is carried out to explore the possibility of their use as reinforcement in green composites. The chemical analysis shows presence of a-cellulose, hemicellulose, and lignin. This is further confirmed by FTIR and high-resolution solid-state 13 C NMR spectroscopy. The influence of alkali treatment on morphology and mechanical properties is attempted by SEM and UTM techniques, respectively. The wide-angle X-ray dif-fraction analysis of the native and treated fibers shows that alkali treatment influences the crystallinity of the fibers. The efficacy of the Borassus fibers (native and treated) as a component of green composites is discussed.

Effect of the Mg/Al ratio and of the rate of reinforcement on the synthesis of a nanocomposite Cellulose/Hydrotalcite

“…The diffraction peaks observed around 2θ of 16° correspond to the diffraction of the plan (110) and represent amorphous cellulose.The diffraction peaks at 2θ of 22° and 34° correspond respectively to diffractions of the plans (002) and (004) and are attributed to the crystalline shape of the cellulose [19]. However, we note the presence of a peak of low intensity at 2θ=11.36° due to traces of Hémicellulose or lignin.…”

“…The IR spectrum of extracted cellulose is represented in figure 2b.It shows the characteristic bands of cellulose.The bands located towards 3400 and 2900 cm -1 correspond respectively to the stretching of O-H and C-H group of the cellulose [19]. A band at 1636 cm -1 is attributed to adsorbed water.The 1370 cm -1 band reflects the asymmetrical deformation of C-H of cellulose [20].…”

Characterisation of Laccase Modified Mukwa (Pterocarpus Angolensis) Wood Flour

“…It is supposed that a rise in crystallinity index is due to the extraction of amorphous lignin loosely attached to the cellulose fibre. The same cannot be said for NaOH pre-treated flours, though alkali treatment is known for increasing CI as observed by other researchers [24] and [25] who found that realignment of cellulose molecules due to loss of amorphous lignin and hemicellulose resulted in an increase of crystallinity. However, 1% and 5 %NaOH+Laccase treated flours have lower crystallinity index than untreated.…”

“…For lignin, absorption bands at 1593, 1512, 1450 and 1033 cm -1 relate to C=C stretching, C-O stretching, -CH 3 asymmetric and aromatic -CH in plane deformation respectively. For hemicelluloses, the absorption bands focused at 1735 and 1228 are assigned to C=O carbonyl stretching and C-O-C stretching vibrations of ester groups [25]. The absorption bands at 1600-1650 cm -1 correspond to bending of absorbed water molecules.…”

Functionalized Polymers from Lignocellulosic Biomass: State of the Art

“…Since hemicellulose degrades more rapidly than cellulose, thermal analysis of hemicellulose-extracted hemp fibers confirmed improved thermal stability [186]. The decrease in the content of hemicellulose resulted in increased Young's modulus and elongation at break for alkali-treated Borassus fruit fibers [187]. Moreover, hot-water-pretreated wood flakes showed a decrease in wettability consistent with a decrease in the hydrophilic character of wood strands.…”