Characterization of hibiscus sabdariffa fiber as potential reinforcement for denture acrylic resins

Abstract

This study aimed to determine the characteristics of Hibiscus sabdariffa as a fiber-reinforcement material for denture acrylic resins. The Hibiscus sabdariffa fiber was extracted by hot water retting. The fiber was treated at room temperature in aqueous solution of NaOH for 8 hours at 8% concentration. Micrometre gauge and Field emission scanning electron microscope (FE-SEM), Archimedes principle, Fourier transform infrared (FTIR) spectroscopy, and Thermogravimetric analyser were used to characterize the diameter, morphology, density, water content and absorption, functional chemical component and thermal behaviour of Hibiscus sabdariffa fiber. In addition, the reinforcing characteristics of Hibiscus sabdariffa fiber was evaluated using denture acrylic resin. The flexural strength was measured in line with ASTM D 790 using Lloyd TM three point bending machine. In line with ASTM D 256, the impact strength was measured using Hounsfield TM charpy tester. The Micrometre gauge and FE-SEM analysis confirmed that diameter of Hibiscus sabdariffa fiber is within the range of other established reinforcing lignocellulosic fibers so also are the density, moisture content and absorption. The FTIR spectroscopy and TGA analysis confirmed the presence of cellulose, hemicellulose and other components in the fiber which were modified by treatment resulting in decreased hydrophilicity of the fibers thereby improving the thermal stability of the fiber. Furthermore, the bond fiber/matrix adhesion was improved which resulted in improve mechanical properties of the composite. The salient features of this study indicated that based on the suitable properties, Hibiscus sabdariffa fiber can be applied to reinforcing denture acrylics. In addition, and potentially, the use of Hibiscus sabdariffa fiber in reinforcement of denture acrylic resins can trigger further economic benefit while ensuring sustainable, green and safer environment.

The bright side of cellulosic hibiscus sabdariffa fibres: towards sustainable materials from the macro- to nano-scale

“…This behaviour was attributed to the removal of hemicelluloses from the fibre surface after mercerization and further enhancement of their hydrophobic character after surface functionalization with SLS. Similar to this work, Okeke and co-workers 37 also reported a reduction in fibre diameter, aspect ratio, density and moisture absorption after the mercerization of the fibres. Oladimeji and Okechukwu 81 investigated the effect of three different chemical treatments, namely, alkali, sodium lauryl sulphate and ethylene diamine tetraacetic acid, on the tensile and water adsorption behaviour of HSFs.…”

“…This process is faster than bacterial processes, but has been reported to influence the physicochemical properties of the fibres in a negative way. Okeke and co-workers 37 carried out the retting of fibres employing a hydrogen-peroxide-based chemical technique. They initially washed the stems with water to remove the sand and dirt present on their surface.…”

Hybrid polyurethane/natural fibers composites optimized by simplex-centroid mixture design

“…Similar behavior has been reported for different fibers with this region ranging from 3300 cm −1 to 3400 cm −1 . 46,53–55…”

“…41,42 The signal observed in the 2940 cm À1 region is characteristic of the asymmetric stretching of C-H methyl units, 43 related to cellulose and hemicellulose saturated hydrocarbons, 44,45 while the band in the 3350 cm À1 region refers to the hydroxyl group (O-H) of the polysaccharides present in the fiber. 46 The band in the region of 1035 cm À1 is characteristic of stretching of the hemicellulose group C-O. 47,48 For the C.B.…”

Experimental characterizations of hybrid natural fiber-reinforced composite for wind turbine blades

“… Material Density (g/cm 3 ) Moisture content (%) Elongation at Break (%) Ref. Nacha fiber 1.38–1.43 7.8–12.46 1.4 [ 37 , 48 ] Sisal fiber 1.2 5–6 8 [ 49 , 50 ] Glass fiber 2.5 - 0.5 [ 51 ] …”