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A. M. Radzi,S. M. Sapuan,M. Jawaid,M. R. Mansor 한국섬유공학회 2019 Fibers and polymers Vol.20 No.4
The aim for this work is to investigate the effect of alkaline treatment on the mechanical, physical and thermalproperties of roselle (RF)/sugar palm fiber (SPF) reinforced thermoplastic polyurethane hybrid composites. RF/SPF hybridcomposites were fabricated at different NaOH concentrations (3 %, 6 % and 9 %) by melt mixing and compression molding. The mechanical, physical and thermal properties of RF/SPF hybrid composites were measured. The morphological propertiesof the tensile fractured sample were examined using scanning electron microscope. Obtained results indicated that the effectof NaOH treatment on the surface improved mechanical, physical and thermal properties accompanied by lower impactresistance. The highest tensile is 14.26 MPa, flexural strength is 14.05 MPa and impact strength is 23.76 kJ/M2) was obtainedfrom treatment 6 % NaOH concentration on RF/SPF hybrid composites. Adhesion bonding between fiber and matrix wasevident by using Scanning electron microscopy (SEM) micrograph of hybrid composite tensile fractured. Scanning electronmicrograph of tensile fractured surfaces of the NaOH treated RF/SPF hybrid composites revealed good adhesion bondingbetween fiber and matrix. Fourier transform infrared spectroscopy analysis was used to observe the effectiveness of NaOHtreatment in the removal impurities on fiber surfaces. Thermogravimetric analysis showed that the treated RF/SPF hybridcomposites had improved the thermal stability. Physical properties showed lower water uptake of the treated thermoplasticpolyurethane hybrid composites. The lowest water uptake is 7.97 % and thickness swelling is 6.49 % obtained from 9 %NaOH concentration after soaked in water for 7 days. Overall, the surface treatment on RF/SPF hybrid composite hasenhanced the composite properties and suitable for automotive part application; battery holder and bottom based.