Showing papers on "SISAL published in 1995"

Short sisal fiber reinforced styrene-butadiene rubber composites

Abstract: Styrene-butadiene rubber (SBR) composites were prepared by incorporating short sisal fibers of different lengths and concentrations into the SBR matrix in a mixing mill according to a base formulation. The curing characteristics of the mixes were studied and the samples were vulcanized at 150°C. The properties of the vulcanizates such as stress-strain behavior, tensile strength, modulus, shore-A hardness, and resilience were studied. Both the cured and uncured properties showed a remarkable anisotropy. It has been found that aspect ratio in the range of 20–60 is effective for sufficient reinforcement. The mechanical properties were found to increase along and across the grain direction with the addition of fibers. The effects of fiber length, orientation, loading, type of bonding agent, and fiber-matrix interaction on the properties of the composites were evaluated. The extent of fiber orientation was estimated from green strength measurements. The adhesion between the fiber and the rubber was enhanced by the addition of a dry bonding system consisting of resorcinol and hexamethylene tetramine. The bonding agent provided shorter curing time and enhanced mechanical properties. The tensile fracture surfaces of the samples have been examined by scanning electron microscopy (SEM) to analyze the fiber surface morphology, orientation, fiber pull-out, and fiber-matrix interfacial adhesion. Finally, anisotropic swelling studies were carried out to analyze the fiber-matrix interaction and fiber orientation. © 1995 John Wiley & Sons, Inc.

A report on the Sisal language project

Abstract: Abstract Sisal (Streams and Iterations in Single Assignment Language) is a general-purpose applicative language intended for use on both conventional and novel multiprocessor systems. In this report we discuss the project's objectives, philosophy, and accomplishments and state our future plans. Four significant results of the Sisal project are compilation techniques for high-performance parallel applicative computation, a microtasking environment that supports dataflow on conventional shared-memory architectures, execution times comparable to those of Fortran, and cost-effective speedup on shared-memory multiprocessors.

Hybrid fibre reinforced polymer composites

Abstract: Thfs paper pcovides an inslght into the mechanical propenies and failure behaviour of hybrid fibre reinforced polymer composnes. Thereare indlcationstnatthe reinforcement Mtwoiypes of fibres into a single matrix often leads to bener properties that would be expeaedfromtheconsideration of the rule of mixtures The recent developments in hybrid fibre reinforced polymer composites have been discussed These include the properties d synthnic fibre1 synthetic fibre, synthetic fibrelglassfibre, naurallibrelglassllbre. Morespecificallythe effectofincorporationotshongiass flble in sisal reinlorced low density polyethylene (LOPE) composles has been presented. It was found that addiiion of glass fibre considerably improves the tensile strength of sisal reinforced polyeihyiene. 1 he effect of orientatton of the fibres an tensile nrength was also studied. it was found thalthe composites containing longltudlnally orienledlibres exhibil bener tensilspropenies than those with randomly oriented znes

From a formal dynamic semantics of Sisal to a Sisal environment

Abstract: We present a formal definition of the dynamic semantics of a significant part of the language Sisal 2.0 in the structural operational style of Natural Semantics, namely Typoi inference rules, within the Centaur system, a generic specification environment. Sisal (Streams and Iteration in a Single Assignment Language) is a strongly typed, applicative, single assignment language in use on a variety of parallel processors, including conventional multiprocessors, vector machines and dataflow machines. >

Chemically induced graft copolymerization of methyl methacrylate onto sisal fibers

Abstract: Graft copolymerization of methyl methacrylate onto sisal fibers using potassium persulfate initiator was studied. The effect of the initiator concentration, monomer concentration, reaction time, reaction temperature and pH, on the grafting percentage, grafting efficiency and total conversion has been investigated. The surface topology, as well as the X-ray diffraction patterns of the modified fibres were also studied. Moreover, the dyeing characteristics of the grafted fibers when dyed with basic dyes together with the color fastness of these dyes towards UV radiations and boiling water were investigated.