SISAL

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

Evaluation and Comparison of Mechanical Properties of Natural Fiber Abaca-sisal Composite

Abstract: With the high usage of the synthetic fiber, the amount of the waste materials has increased as the degradation process is quite slow and with the burning of the synthetic fibers creates toxic gas and other environmental hazards. Presently natural fibershas many implications like low density, cheap, high specific properties, non-abrasive and less harmful during manufacturing and most importantly the abundance in nature and can be made by planting. Because of which it is giving a good run compare to conventional glass and carbon fibers composites. The glass fiber composite is replaced by natural fiber composites for environmental sustainability. Fiber extracted from plants is renewable and low levels of embodied energy compared to synthetic fibers. This paper deals with comparison of mechanical properties of a hybrid composite (abaca + sisal) and comparing the results with the ABAQUS simulation results. This hybrid composite consists of three layers with top and bottom layers of sisal fibers and the middle layer is made up of abaca fiber. These hybrid composites (sisal + abaca) were fabricated with different orientations (0 °, 45 °, 90 °) of fiber. The above said composite is fabricated by using hand layup method. Epoxy resin along with Huntsman Resin 951 hardener was used as the binding agent throughout the layer. The ultimate tensile strength and percentage elongation of the composite were 90 ° oriented fiber composite is found to be higher value compared to 0 °, 45 ° oriented fiber. Flexural strength of the composite was 45 °, 90 ° orientedfiber composite having same value, whereas 0 ° fiber-oriented composite having least value. The ultimate shear strength of composite was 45 ° oriented fiber composite is found to be higher value compare to the other two oriented fiber composites (90 °, 0 °). The breaking load of composite 0 ° oriented fiber composite is high value compareto the other two oriented fiber composites (45 °, 90 °). Scanning electron microscope is used to analyse the internal structural of the broken specimen.

Sisal hemp steroid hormone production method

Abstract: The invention is a sisal hemp (agave americana) steroid saponin producing method, a producing technique and method to extract steroid saponin from roots, stems and leaves of sisal hemp (agave americana). Its character: crush sisal hemp (agave americana) into 8-20nm particles, mix with water and fermenting enzyme preparation to ferment at normal temperature for 24-96 hours. It hydrolyzes the dry fermentation substance by water and additives (HCl and acetone, vitriol and dimethylbenzene, and caustic soda and acetone). It solves the difficult separation of colloidal substance and hydrolyzing substance, heightening the yield of saponin and thus making the residual saponin in the hydrolyzing substance residue below 0.3%.

Analysis of the Mechanical Strength of Polymeric Composites Reinforced with Sisal Fibers

Abstract: This work focused on the evaluation of the mechanical strength of sisal fiber reinforced composites panels in view of using vacuum infusion processing method. The most recent market requirements ar...

Influences of various natural fibers on the mechanical and drilling characteristics of coir-fiber-based hybrid epoxy composites

Abstract: In this research, the hybrid natural fiber composite specimens were fabricated with a 64 wt% epoxy resin matrix, 20 wt% coir fiber, and 16 wt% of various natural fibers by the hand-layup method. The influences of various natural fibers (Coir, Jute, Flax, Cotton, Human Hair, Sisal, Kenaf, and Calotropis) on the mechanical characteristics (tensile, flexural, and impact strengths) and drilling properties (delamination factor and ovality) of the Coir-fiber based hybrid composite have been investigated. The maximum tensile strength (48.15 MPa), maximum flexural strength (47.87 MPa), and maximum impact strength (2.85 kJ m−2) have been obtained by Coir/Flax, Coir/Sisal, and Coir/Hair Fiber hybrid composite materials, respectively. The minimum delamination factor (1.0) and ovality (169.4 μm) were obtained by coir/flax and coir/jute hybrid composite specimens when compared to other combinations of specimens. The delamination factor and ovality of the drilled hole of all combinations of hybrid composite specimens have been analyzed by scanning electron microscopy (SEM) images. The delamination factors of Coir/Flax and the drilling ovalities of Coir/Jute composite specimens are lower than those of other combinations of Coir-fiber-based composites.

The effect of surface modifications on the mechanical and thermal properties of empty fruit bunch oil palm fibre PP biocomposites

Abstract: Sustainable polymeric materials put emphasis on mastering the whole life-cycle of polymeric materials. This includes the choice of raw materials, selection of synthesis and processing, environmental impact during long-term use followed by detailed knowledge about recycling and waste management. Within this large efforts are put in the design and development of new biocomposites using renewable fibres instead of inert ones. The thesis deals with surface modifications of agricultural fibres and the design of biocomposites with optimal long-term properties balancing the potential risk for biodegradation. The first part of this thesis involved surface modifications of oil palm fibres and production of biocomposites with PP as matrix. The chemical surface modifications of oil palm fibres explored propionylation, PPgMA grafting via solution modification and reactive blending and vinyltrimethoxy silanization as methods. All modified fibre/PP biocomposites showed improvements in the mechanical properties followed also by an improvement of water resistance. In comparison with unmodificed fibres/PP matrix the highest water resistance after the surface modifications of oil palm fibres were observed for silanization followed by PPgMA modified, PPgMA blending and propionylation.The second part aimed at producing fully biodegradable biocomposites and analysing the resulting properties with respect to potential risk for biodegradation. Sisal fibres were incorporated in PLA and PHBV and the resulting risk for biodegradation using a fungus, Aspergillus niger, monitored. Neat PLA and PHBV were compared with the corresponding biocomposites and already without fibres both polymers were notably biodegraded by Aspergillus niger. The degree of biodegradation of PLA and PHBV matrices was related to the extent of the growth on the material surfaces. Adding sisal fibres gave a substantial increase in the growth on the surfaces of the biocomposites.Correlating the type of surface modification of sisal fibres with degree of biodegradation, it was demonstrated that all chemically modified sisal/PLA biocomposites were less biodegraded than unmodified sisal biocomposites. Propionylated sisal/PLA demonstrated the best resistance to biodegradation of all biocomposites while sisal/CA/PLA demonstrated high level of biodegradation after severe invasion by Aspergillus niger.In general, the biodegradation correlated strongly with the degree of water absorption and surface modifications that increase the hydrophobicity is a route to improve the resistance to biodegradation.Designing new biocomposites using renewable fibres and non-renewable and renewable matrices involve the balancing of the increase in mechanical properties, after improved adhesion between fibres and the polymer matrix, with the potential risk for biodegradation.