@article{10.11648/j.am.20221103.11,
  author = {Babacar Niang and Abdoulaye Bouya Diop and Abdou Karim Farota and Nicola Schiavone and Haroutioun Askanian and Vincent Verney and Abdoul Karim Mbodji and Malick Wade and Diène Ndiaye and Bouya Diop},
  title = {Thermomechanical and Structural Analysis of Biocomposites and Gamma Irradiation and Photoaging on Mechanical and Viscoelastic Properties},
  journal = {Advances in Materials},
  volume = {11},
  number = {3},
  pages = {50-59},
  doi = {10.11648/j.am.20221103.11},
  url = {https://doi.org/10.11648/j.am.20221103.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.am.20221103.11},
  abstract = {The replacement of petrochemical fibres with natural fibres for reinforcing polyvinyl chloride matrix biomaterials is currently being researched and applied in the technical and technological fields. Natural fibres offer environmental advantages combined with economic advantages related to comparatively lower cost and lower energy consumption. it is in this context that typha stem fibres extracted from the typha plant found in south-saharan Africa are used in this study for the manufacture of biocomposites. The objective is to evaluate the thermogravimetric (TG/DTG) and viscoelastic behaviour of polyolefin matrix biocomposites reinforced with relatively high volume fractions, 25, 35 and 45%, of typha stem powder. The incorporation of typha stem powder slightly reduces the thermal stability of the biomaterials by decreasing the thermal degradation onset temperature and the DTG peak temperature compared to pure matrices. The limit for the practical application of these composites could be set at 270°C, before the onset of major weight loss. Monitoring of the different materials by rheological measurements during photoaging allowed to understand the mechanisms of photodegradation. The shear thinnig behaviour observed on the complex viscosity points to possible small changes at the molecular level. Photochemical degradation over the photo-aging cycles resulted in cut-off and recombination phenomena. Dynamic storage moduli (G') and loss moduli (G'') tend to increase with the proportion of typha powder. The dynamic storage modulus (G') and loss modulus (G'') tend to increase with the proportion of typha powder. We observed a rheofluidic behaviour by shearing of the melt. The dynamic storage (G') and loss (G'') moduli tend to increase with the proportion of typha powder. From a thermal and rheological point of view, HDPE-based biocomposites show interesting properties for use in applications. The influence of gamma irradiation leads to a competition between two mechanisms (chain breaks and recombination) of photooxidation that take place together within the material. Mechanical properties such as tensile and flexural strength are improved with increasing gamma radiation dose up to 75 kGy.},
 year = {2022}
}

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TY  - JOUR
T1  - Thermomechanical and Structural Analysis of Biocomposites and Gamma Irradiation and Photoaging on Mechanical and Viscoelastic Properties
AU  - Babacar Niang
AU  - Abdoulaye Bouya Diop
AU  - Abdou Karim Farota
AU  - Nicola Schiavone
AU  - Haroutioun Askanian
AU  - Vincent Verney
AU  - Abdoul Karim Mbodji
AU  - Malick Wade
AU  - Diène Ndiaye
AU  - Bouya Diop
Y1  - 2022/07/26
PY  - 2022
N1  - https://doi.org/10.11648/j.am.20221103.11
DO  - 10.11648/j.am.20221103.11
T2  - Advances in Materials
JF  - Advances in Materials
JO  - Advances in Materials
SP  - 50
EP  - 59
PB  - Science Publishing Group
SN  - 2327-252X
UR  - https://doi.org/10.11648/j.am.20221103.11
AB  - The replacement of petrochemical fibres with natural fibres for reinforcing polyvinyl chloride matrix biomaterials is currently being researched and applied in the technical and technological fields. Natural fibres offer environmental advantages combined with economic advantages related to comparatively lower cost and lower energy consumption. it is in this context that typha stem fibres extracted from the typha plant found in south-saharan Africa are used in this study for the manufacture of biocomposites. The objective is to evaluate the thermogravimetric (TG/DTG) and viscoelastic behaviour of polyolefin matrix biocomposites reinforced with relatively high volume fractions, 25, 35 and 45%, of typha stem powder. The incorporation of typha stem powder slightly reduces the thermal stability of the biomaterials by decreasing the thermal degradation onset temperature and the DTG peak temperature compared to pure matrices. The limit for the practical application of these composites could be set at 270°C, before the onset of major weight loss. Monitoring of the different materials by rheological measurements during photoaging allowed to understand the mechanisms of photodegradation. The shear thinnig behaviour observed on the complex viscosity points to possible small changes at the molecular level. Photochemical degradation over the photo-aging cycles resulted in cut-off and recombination phenomena. Dynamic storage moduli (G') and loss moduli (G'') tend to increase with the proportion of typha powder. The dynamic storage modulus (G') and loss modulus (G'') tend to increase with the proportion of typha powder. We observed a rheofluidic behaviour by shearing of the melt. The dynamic storage (G') and loss (G'') moduli tend to increase with the proportion of typha powder. From a thermal and rheological point of view, HDPE-based biocomposites show interesting properties for use in applications. The influence of gamma irradiation leads to a competition between two mechanisms (chain breaks and recombination) of photooxidation that take place together within the material. Mechanical properties such as tensile and flexural strength are improved with increasing gamma radiation dose up to 75 kGy.
VL  - 11
IS  - 3
ER  - 

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