scholarly journals Effect of Fiber Surface Treatment on the Interface and Bending Strength of Aramid Short Fiber Composite

2000 ◽  
Vol 49 (9Appendix) ◽  
pp. 186-192
Author(s):  
A.K.M. MASUD ◽  
Kiyoshi ISOGIMI ◽  
Jippei SUZUKI
Keyword(s):  
Surface Treatment ◽  
Bending Strength ◽  
Fiber Composite ◽  
Fiber Surface ◽  
Short Fiber ◽  
Fiber Surface Treatment ◽  
Short Fiber Composite

scholarly journals Effect of Hemp Fiber Surface Treatment on the Moisture/Water Resistance and Reaction to Fire of Reinforced PLA Composites

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4332
Author(s):  
Percy Festus Alao ◽  
Laetitia Marrot ◽  
Heikko Kallakas ◽  
Alar Just ◽  
Triinu Poltimäe ◽  
...  
Keyword(s):  
Surface Treatment ◽  
Water Resistance ◽  
Fiber Composite ◽  
Fiber Surface ◽  
Hydroxyl Groups ◽  
Cone Calorimetry ◽  
Hemp Fiber ◽  
Moisture Adsorption ◽  
Surface Pretreatment ◽  
Fiber Surface Treatment

The effects of surface pretreatment (water and alkali) and modification with silane on moisture sorption, water resistance, and reaction to fire of hemp fiber reinforced polylactic acid (PLA) composites at two fiber loading contents (30 and 50 wt.%) are investigated in this work. Moisture adsorption was evaluated at 30, 50, 75 and 95% relative humidity, and water resistance was determined after a 28-day immersion period. The cone calorimetry technique was used to investigate response to fire. The fiber surface treatment resulted in the removal of cell wall components, which increased fiber individualization and homogeneity as shown in scanning microscopic pictures of the composite cross-section. Although the improved fiber/matrix bonding increased the composite’s water resistance, the different fiber treatments generated equal moisture adsorption results for the 30 wt.% reinforced composites. Overall, increasing the fiber amount from 30 to 50 wt.% increased the composite sensitivity to moisture/water, mainly due to the availability of more hydroxyl groups and to the development of a higher pore volume, but fire protection improved due to a reduction in the rate of thermal degradation induced by the reduced PLA content. The new Oswin’s model predicted the composite adsorption isotherm well. The 30 wt.% alkali and silane treated hemp fiber composite had the lowest overall adsorption (9%) while the 50 wt.% variant produced the highest ignition temperature (181 ± 18 °C).

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