SISAL

About: SISAL is a research topic. Over the lifetime, 1878 publications have been published within this topic receiving 55528 citations.

Electrical and mechanical properties of the potassium permanganate treated short sisal fiber reinforced epoxy composite in correlation to the macromolecular structure of the reinforced fiber

Abstract: Sisal fibers are treated with potassium permanganent (KMnO4)—acetone solution for various concentrations for different soaking time period prior to the composite fabrication. Small angle X-ray scattering (SAXS) and wide angle X-ray diffraction (WAXD) analysis shows significant change in the macromolecular and the crystallographic parameters of the fiber, respectively, after the treatment. Fiber treated with 0.05% KMnO4-acetone solution for 2 min (05K2) is found to have highest degree of crystalinity, crystallite size, and bulk density. Enhanced tensile and flexural strength of the 05K2 reinforced epoxy composite (05KC2) is attributed to the increase surface roughness of the fiber. Lower values of dielectric constant (er), dielectric loss (tan δ) and improved volume resistivity (ρ) for the 05KC2 composite may be due to the hindered molecular motion of the polymeric chains at the composite interface resulting from the better interlocking between the fiber and matrix. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

Behavior of sisal fiber concrete cylinders externally wrapped with jute FRP

Abstract: The use of environmentally friendly natural fibers as building materials is benefit to achieve a sustainable construction. This article performs a study on the use of natural jute fibers as reinforcement of concrete and natural sisal fibers in fiber reinforced polymer (FRP) composites as concrete confinement, i.e. sisal fiber reinforced concrete (SFRC) composite column wrapped by jute FRP (JFRP) (SFRC-JFRP). Uniaxial compression test was conducted to assess the compression performance of the composite columns as axial structural member. A total of 24 specimens were tested. The effects of JFRP wrapping thickness and sisal fiber inclusion on the compressive performance of the composite columns were investigated. Results indicate that JFRP confinement significantly increases the compressive strength and ductility of both PC and SFRC with an increase in JFRP thickness. Besides, the inclusion of sisal fiber further enhances the strength as well as the efficiency of confinement under uniaxial compression. Also, the models for ultimate strength and ultimate strain of PC-JFRP and SFRC-JFRP are proposed. POLYM. COMPOS., 2015. © 2015 Society of Plastics Engineers

Interface Bond Improvement of Sisal Fibre Reinforced Polylactide Composites with Added Epoxy Oligomer.

Abstract: To improve the interfacial bonding of sisal fiber-reinforced polylactide biocomposites, polylactide (PLA) and sisal fibers (SF) were melt-blended to fabricate bio-based composites via in situ reactive interfacial compatibilization with addition of a commercial grade epoxy-functionalized oligomer Joncryl ADR@-4368 (ADR). The FTIR (Fourier Transform infrared spectroscopy) analysis and SEM (scanning electron microscope) characterization demonstrated that the PLA molecular chain was bonded to the fiber surface and the epoxy-functionalized oligomer played a hinge-like role between the sisal fibers and the PLA matrix, which resulted in improved interfacial adhesion between the fibers and the PLA matrix. The interfacial reaction and microstructures of composites were further investigated by thermal and rheological analyses, which indicated that the mobility of the PLA molecular chain in composites was restricted because of the introduction of the ADR oligomer, which in turn reflected the improved interfacial interaction between SF and the PLA matrix. These results were further justified with the calculation of activation energies of glass transition relaxation (∆Ea) by dynamic mechanical analysis. The mechanical properties of PLA/SF composites were simultaneously reinforced and toughened with the addition of ADR oligomer. The interfacial interaction and structure–properties relationship of the composites are the key points of this study.

Interfacial adhesion in fully and partially biodegradable polymer composites examined with microdroplet test and acoustic emission

Abstract: The interfacial adhesion of three different natural reinforcing fibers and three different matrix materials was examined by the microdroplet method and the process of acoustic emission. Flax, hemp and sisal reinforcing fibers and synthetic polypropylene, biodegradable MaterBi and PuraSorb PL matrix materials were used. Based on a large number of measurement results the strength of adhesion between the fiber and the matrix, as well as the critical fiber lengths were determined besides the strength properties of single fibers. The characteristic failure modes were also revealed from the microdroplet test and analysis of acoustic emission signals. The different material combinations were qualified with the help of comparative analysis. It was found that due to the relatively large diameters and deviations — characteristic of the structure of natural fibers — critical fiber length values turned out to be large as well. The sisal fiber and PuraSorb matrix droplet showed the highest interfacial shear strength o...