Biofibers of papaya tree bast: a statistical study of the mechanical properties for use potential in polymeric composites

The aim of this study is to prepare composite nanomaterials and to improve some of their mechanical properties as a creep rate using nanoparticles that are prepared in the laboratory by ultrasound available using Impact Polystyrene (HIPS) and Polyethylene (HDPE) as matrix materials. Nanoclays are made of Bentonite-reinforced materials. This research studies the addition of nanoclays with thermos plastic polymers in weight fraction percentage (1%, 2%, 3% and 4%) and makes a comparison among them.

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Functionally Graded Polymeric Composites Having Micro-Tailored Structure Formed by Electric Field

Materials ◽

10.1115/imece2003-43518 ◽

2003 ◽

Cited By ~ 1

Author(s):

Geun Hyung Kim ◽

Daniel K. Moeller ◽

Yuri M. Shkel

Keyword(s):

Mechanical Properties ◽

Electric Field ◽

Functionally Graded Materials ◽

Applied Electric Field ◽

Polymeric Composites ◽

Functionally Graded ◽

Graded Materials ◽

Functionally Graded Composites ◽

Liquid Suspensions ◽

Redistribution Effect

A solid composite having locally micro-tailored structure can be produced by curing liquid polymeric suspensions in an electric field. The redistribution effect of the field-induced forces exceeds the effect of centrifugation, presently employed to manufacture functionally graded materials. Moreover, unlike centrifugational sedimentation, one can electrically rearrange the inclusions in desired targeted areas. The applied electric field can be employed to produce a composite having uniformly oriented structure or only modify the material in selected regions. This technology enables polymeric composites to be locally micro-tailored for given design objectives. We discuss electrical and rheological inteactions in liquid suspensions. Relationships between microstructure and mechanical properties of the obtained functionally graded composites are presented.

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Optimization of the Concrete Mix Proportions Centered on Performance after Exposure to High Temperature

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.268-270.372 ◽

2011 ◽

Vol 268-270 ◽

pp. 372-376 ◽

Cited By ~ 2

Author(s):

A. Chaboki-Khiabani ◽

M. Bastami ◽

M. Baghbadrani ◽

M. Kordi

Keyword(s):

Mechanical Properties ◽

Elevated Temperature ◽

Statistical Study ◽

High Strength ◽

Taguchi Approach ◽

Effective Parameters ◽

Mix Proportion ◽

Concrete Mix ◽

Tensile Splitting Strength ◽

Considerable Loss

This paper presents the results of an experimental and statistical study on the effect of high temperatures on the retained mechanical properties of high-strength concretes (HSC). The mechanical properties of HSC significantly change during and later than exposure to elevated temperature. The compressive and splitting tensile strength of more than 400 HSC cylindrical specimens with sixteen mix proportion have investigated to study the effect of mix proportion on the retained mechanical properties of HSC specimens after heating. According to these results, a considerable loss was observed for all mixes and specimens in strength particularly in tensile splitting strength. In addition, these experimental data were investigated using Taguchi approach to find the effective parameters of mix proportion. Also, the most optimum mix proportion was found and checked experimentally. According to our results, by controlling some factors in the mix proportion, it is possible to reduce the retained destructive effects of elevated temperature on HSC specimens.

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