Showing papers on "SISAL published in 1993"
TL;DR: In this article, the dynamic mechanical properties of low density polyethylene filled with isocyanate treated and untreated short sisal fiber composites were studied as a function of temperature and frequency.
Abstract: The dynamic mechanical properties of low density polyethylene filled with isocyanate treated and untreated short sisal fiber composites were studied as a function of temperature and frequency. By the incorporation of short sisal fiber into LDPE, the stor age moduli (E') and loss moduli (E") increase, whereas the mechanical loss factor decreases. The effects of fiber-matrix adhesion on the viscoelastic properties of the com posites have been studied and it has been found that the increase in adhesion increases the storage modulus. The effects of fiber length, fiber orientation, and fiber loading on the dynamic mechanical properties have also been investigated. In all cases, storage moduli (E') and loss moduli (E") decrease with temperature and increase with fiber loading.
107 citations
TL;DR: In this article, the effect of plant age on tensile strength, tensile modulus and toughness of sisal fibre became very much less at 100 °C as compared to 30 °C.
Abstract: Sisal fibres extracted from the leaves of Agava sisalana plants 3, 5, 7 and 9 years old were tested at different temperatures for tensile strength, elongation, toughness and modulus. The tensile strength, modulus and toughness values of sisal fibre decreased with increase in temperature. The effect of plant age on tensile strength, tensile modulus and toughness of sisal fibre became very much less at 100 °C as compared to 30 °C. Fractured fibres were observed by using a scanning electron microscope. The ends of fibres fractured at elevated temperature showed a failure similar to that of inorganic fibres. Elongation values at all temperatures increased with age. Elongated capillaries were observed in fibres fractured at 80 and 100 °C, due to the removal of moisture and volatiles originally present in the fibres. The fibrils are clearly observed in the form of hollow cylinders. Fractured surfaces are composed of brittle as well as ductile phases. The ductile portion increased with the increase of temperature.
107 citations
Journal Article•
8 citations
Patent•
09 Sep 1993
TL;DR: Composite sheets as mentioned in this paper are composite materials with high toughness, strength and rigidity, which are cheaper than corresp. materials contg. glass fibre, used for producing moulded parts for cars, machine construction and domestic appliances.
Abstract: Composite sheets (I) are claimed, contg. a polyolefin matrix (II) reinforced with mats of natural fibre with fibre wt. above 10 tex (III). (I) contains 20-70 wt.% (III), pref. in the form of needled mat based on sisal fibres more than 10mm long (mean.) (II) is polypropylene (PP) with MFI (230/2.16) = 5-500g/10 mins., or a mixt. of 99-80 wt.% PP and 1-20 wt.% maleic anhydride-grafted USE/ADVANTAGE - Used for producing moulded parts for cars, machine construction and domestic appliances. (I) are composite materials with high toughness, strength and rigidity, which are cheaper than corresp. materials contg. glass fibre.
2 citations