Extraction and characterization of novel lignocellulosic fibers from Centaurea hyalolepis plant as a potential reinforcement for composite materials

Abstract

The aim of this investigation is to evaluate the use of new lignocellulosic fiber extracted from Centaurea hyalolepis plant as a potential reinforcement for light-weight composite applications. In this study, anatomical structure and morphological surface of Centaurea hyalolepis fiber were conducted. The physical-chemical, thermal, crystalline,mechanical, characteristics of extracted fibers were also examined using Attenuated Total Reflectance-Fourier Transform Infrared (ATR-FTIR), thermogravimetric analysis (TGA), X-ray diffraction (XRD) and tensile test. ATR-FTIR analysis confirmed the existence of the main components of lignocellulosic fiber (lignin, cellulose, and hemicellulose). XRD revealed the presence of cellulose with a crystallinity index of 57.93%.By densimetry, the density of Centaurea hyalolepis was determined as 1.13 g/cm3. The Centaurea hyalolepis was found to be thermally stable up to 271°C. The kinetic activation energy was determined as 115.943 kJ/mol. Tensile tests revealed that the mean tensile strength and Young’s modulus of Centaurea hyalolepis fiber were about 372,5 MPa and 9.036 GPa respectively. Because of the dispersion in the experimental tensile results, the Weibull statistical analysis with two parameters was carried out. Regard these findings, the Centaurea hyalolepis fibers can be a suitable candidate for low density polymeric composites reinforcement.

Formulation and Evaluation of Lip Balm Using Different Herbal Pigments

“…[34,35] The FTIR of pigment obtained from Centaurea orientalis showed the presence-OH stretch (broad) at 3570-3200 cm -1 , also aromatic C-H stretch at range 3130-3070 cm -1 , -OH stretch at 3640-3530 cm -1 , at the range of 2820-2810 cm -1 showed C-H stretch, C-H stretch at 2850-2815 cm -1 , at range of 1680-1620 showed C=O,C=C stretching, at range of 1680-1620 cm -1 showed alkenyl C=C stretching, also at 1490 cm -1 showed aromatic C=C group, bending at 1470-1430/1380-1370 cm -1 , at 1490 cm -1 obtained aromatic C=C group, several peaks reported in the finger print region such as, aromatic C-H in-plane bend at 1225-950 cm -1 , also C-O at 1246 cm -1 , at range of 1300-700 cm -1 showed C-C group, C-O stretching showed at around 1200 cm -1 , also several aromatic C-H out-of-plane bend at range of 900-670 cm -1 , at range of 1150-1050 cm -1 showed C-O stretch, C=C-C aromatic ring stretch 1615-1580 cm -1 /1510-1450 cm -1 /3130-3070 cm -1 , stretching at 705-570 cm -1 showed C-S group, also at 1079 cm -1 C-OH stretching reported, as shown in Figure 3. [36,37] Bees Wax: The peak range around 2900-3000 cm -1 showed C-H asymmetric stretching vibration (hydrocarbons) and CH 2 symmetric, in the finger print region showed various peaks the range of 1127 cm -1 showed (CH 2 -C=O stretching and C-H…”

Extraction and characterization of novel natural cellulosic fiber from Echinops spinosissimus plant stem

“…As for the vascular bundles, they consist mainly of xylem and phloem, exactly as mentioned in previous works report the anatomical investigations on natural fibers by several researchers such as Centaurea melitensis, 24 Malva sylvestris L. 25 and Centaurea hyalolepis. 26…”