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Mechanical Properties of Polymers and Composites
14 Dec 1993-
TL;DR: In this article, the authors discuss various mechanical properties of fiber-filled composites, such as elastic moduli, creep and stress relaxation, and other mechanical properties such as stress-strain behavior and strength.
Abstract: Mechanical Tests and Polymer Transitions * Elastic Moduli * Creep and Stress Relaxation * Dynamical Mechanical Properties * Stress-Strain Behaviour and Strength * Other mechanical Properties * Particulate-Filled Polymers * Fiber- Filled Composites and Other Composites.
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TL;DR: In this article, the effect of sorbate present on mechanical properties of edible films prepared with suspensions of tapioca starch containing glycerol, was studied with a Dynamic Mechanical Thermal Analyzer.
Abstract: The effect of sorbate present on mechanical properties of edible films prepared with suspensions of tapioca starch containing glycerol, was studied. Films were prepared by casting the systems after gelatinization. The storage modulus ( E ′) and the tangent of the phase angle (tan δ ) of the film pieces were determined with a Dynamic Mechanical Thermal Analyzer along 8 weeks of storage at a relative humidity (RH) of 57.5% and at 25 °C. Stress–strain behavior along quasi-static tests was also analysed using the same device. Results obtained showed that sorbate incorporation resulted in a decrease (≅75%) of E ′ and an increase (≅200%) of tan δ after 2 weeks of storage. Antimicrobial presence also affected film performance along storage: it showed a continuous decrease of tan δ along 8 weeks storage as well as an increase in the tendency to rupture with time. Films without sorbate showed an increase of tan δ along 4 weeks and they presented rupture for all storage periods studied. Aging of starch, characteristics of the network as well as sorbate destruction along storage, are responsible for the changes observed in mechanical properties of the film along 8 weeks.
165 citations
TL;DR: In this article, the effects of various types of compatibilizers on the mechanical properties of high-density polyethylene/wood flour composites were investigated, including maleated polyethylenes, polypropylene, and styrene-ethylene-butylene-styrene copolymer.
Abstract: The effects of various types of compatibilizers on the mechanical properties of high-density polyethylene/wood flour composites were investigated. Functionalized polyolefins, including maleated polyethylenes, polypropylene, and styrene–ethylene/butylene–styrene copolymer, were incorporated to reduce the interfacial tension between the polyethylene matrix and wood filler. Of these, maleated linear low-density and high-density polyethylenes gave higher tensile and impact strengths for the composites, presumably because of their better compatibility with the high-density polyethylene matrix. Similar but less enhanced improvements in the mechanical properties, depending on the compatibilizer loading, were seen for a maleated styrene–ethylene/butylene–styrene triblock copolymer, whereas maleated polypropylene only slightly improved the tensile modulus and tensile strength, which increased with increasing compatibilizer loadings. Scanning electron microscopy was used to reveal the interfacial region and confirm these findings. Dynamic mechanical thermal measurements showed the interaction between the filler and the matrix. Fourier transform infrared spectroscopy was used to assign the chemical fixation and the various chemical species involved on the surfaces of the fillers before and after surface treatment. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 87: 487–496, 2003
164 citations
TL;DR: In this paper, a series of heterogeneous materials composed of conducting carbon particles randomly dispersed inside a polymeric matrix have been prepared, and the piezoresistive effects of the materials are investigated under hydrostatic and uniaxial pressures.
Abstract: Several series of heterogeneous materials composed of conducting carbon particles randomly dispersed inside a polymeric matrix have been prepared. The particles are a carbon black and short graphite fibers. The polymers are epoxy resins and a silicon elastomer. In each series of materials an insulator‐to‐conductor transition is evidenced in agreement with percolation theory as the volume‐particle concentration is varied. The piezoresistive effects of the materials are investigated under hydrostatic and uniaxial pressures. It is shown that the piezoresistance depends on materials composition, pressure, and carbon concentration. In each series, the piezoresistance increases rapidly as the concentration decreases towards the conductivity threshold. The range of pressure values over which the piezoresistance varies faster depends on the elastic properties of the matrix and on whether the applied pressure is hydrostatic or uniaxial. All these behaviors are accounted for by an extension of percolation theory in...
164 citations
TL;DR: In this paper, thermal and electrical conductivity, thermal diffusivity of high density polyethylene, polystyrene/graphite composites were investigated using two different types of graphite (different distribution of the particle size, different specific surface) and also mechanical properties were investigated.
162 citations
TL;DR: In this paper, the effect of lipids (endogenous granular and added lipids) on the viscoelastic properties of thermoset starch gel using small-strain oscillatory rheological testing was investigated.
Abstract: The study was undertaken to determine the effect of lipids (endogenous granular and added lipids) on the viscoelastic properties of thermoset starch gel using small-strain oscillatory rheological testing. The ability of lipids to interact with the starch as well as their antistalting action was proned by DSC and small deformation rheological measurements.
162 citations