Comprehensive characterization of raw and alkali (NaOH) treated natural fibers from Symphirema involucratum stem

The present study investigated the effect of alkali treatment on the enhancement of Physico-chemical, tensile, thermal and surface properties of Symphirema involucratum stem fiber (SISF). The investigation of chemical constituents of optimally alkalized SISF revealed that ideal increment of cellulose content (68.69 wt%) and desired modification of other chemical components was accomplished through 60 min immersion period. An increase in the crystallinity index to 33.33% and small crystallite size to 3.21 nm was noted by X-ray diffraction analysis. Moreover, the treated fiber was found suitable for light-weight applications since physical analysis acknowledges that the density of the fiber augmented to 1424 kg/m(3) after surface treatment that reduces total weight percentage. The enhancements in tensile strength (471.2 +/- 19.8 MPa), tensile modulus (5.82 +/- 0.77 GPa) and thermal stability (371 degrees C) were noted that ensures the treated fiber has good mechanical and thermal properties required for composite preparation. These findings validated that the optimally surface-modified SISF is a suitable material for lightweight composite structures, for the time being.

Automated summary

The study demonstrated that alkali treatment significantly enhanced the physical, chemical, tensile, thermal, and surface properties of Symphirema involucratum stem fiber. The treated fiber showed improvements in density, crystallinity, tensile strength, and thermal stability, making it suitable for lightweight composite structures.