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Physical-Chemical and Mechanical Characterization of the Bast Fibers of Triumfetta cordifolia A.Rich. from the Equatorial Region of Cameroon

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Document pages: 14 pages

Abstract: The project consists in the implementation of a biocomposite based ontannin resin and natural rubber matrices with the bast fibres of Triumfetta cordifolia A.Rich.“Okong” from the equatorial region ofCameroon as reinforcement. A study of this still little known fibre isnecessary. This paper evaluates the physico-chemical and mechanicalcharacteristics of the fibers. The fibers are extracted by us. A series ofexperiments is conducted for this purpose: morphological observation with ascanning electron microscope (SEM); density evaluation with a heliumpycnometer; absorption rate evaluation according to the protocol available inthe literature, Fourier Transform Infrared Spectrometry (FT-IR), chemicalcomposition evaluation according to ASTM 1972 and ASTM 1977 standards,thermogravimetric analysis (TGA) and tensile tests on fiber bundles accordingto NF T25-501-3. The results show that the fiber is made up of severalelementary fibers with oval cross-sections. A density of 1.477g cm3 close to that of hemp. These fibers have a water absorption rate of 342.5 ,which correlates with the presence of free hydroxyl functional groups obtainedfrom the spectrometry study (FT-IR). Chemical analysis reveals that the fiberis made up of celluloses (44.4 ), hemicelluloses (30.8 ), lignins (18.9 ),pectins (3.3 ), waxes (0.5 ) and minerals (2.1 ). In addition, we learn thatthe fibers studied dehydrate at 11.49 , showinga notable thermal stability around 235°C with a peak thermaldecomposition of cellulose located at 420°C. In terms of mechanical behaviour,the results reveal that the fibers offer a Young’s modulus in traction of 12.4± 6.9 GPa, a tensile strength of 526 ± 128 MPa and an elongation at break of2.25 . The information thus obtained makes it possible to place these fibers inthe same fiber group as flax and jute. They could therefore be used for thesame types of applications. They also inform us that these fibers can withstandthe temperatures of composite shaping by thermocompression.

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