Showing papers in "Polymer Testing in 2010"

TL;DR: Using atomic force microscopy (AFM) nanoindentation, this article measured the mechanical properties of various polymers, such as low density polyethylene, polyvinyl alcohol, high density polymethyl alcohol, ultra high molecular weight polyethylenes, poly(methyl methacrylate), polystyrene and polyacrylic acid, and the hardness and Young's modulus of the polymers were obtained by AFM through both the force-indentations and area-depth curves.

TL;DR: In this paper, the limits of optical strain measurement system under different environmental conditions were investigated, and the technique was applied to the characterization of polypropylene (PP) and PP composites (PP-C) in the pre- and post-yield regimes.

TL;DR: In this paper, the authors employed terahertz time-domain spectroscopy to study the sorption of water into two different materials: polyamide (PA) and wood plastic composite (WPC).

TL;DR: In this article, the authors developed black and white biodegradable films by extrusion from cassava starch and poly(butylene adipate-co-terephthalate) (PBAT) blends to use as mulching film in strawberry production.

TL;DR: In this article, the authors investigated and evaluated the measuring and monitoring of real-time resin shrinkage using a rheometer, a helium-based pycnometer and a thermo-mechanical analyzer (TMA) for ambient curing UP and epoxy resins.

TL;DR: In this paper, an experimental investigation on the progressive deformation behavior of uni-directional pultruded composite tubes subjected to an axial impact load is presented. And the effects of the geometry profile, triggering, strain rate and the type of resin on energy absorption of the composite tubes were studied in detail.

TL;DR: In this article, the effects of epoxidized natural rubber (ENR-50) as a compatibilizer on the properties of styrene butadiene rubber/recycled acrylonitrile-butadiene (SBR/NBRr) blends were studied.

TL;DR: In this paper, the effect of ground tire rubber (GTR) and recycled polyethylene (RPE) on the thermal and rheological properties of modified bitumen blends was investigated.

TL;DR: In this paper, high strain rate tensile behavior is presented along thickness, warp, and fill directions for a typical plain weave fabric E-glass/epoxy composite, and the properties along warp and fill are nearly identical.

TL;DR: In this paper, the effect of dynamic tension/compression loading on selective laser sintered components in polyamide was analyzed and it was shown that crack initiation starts from inclusions in the material caused by unfused powder particles, leading to the formation of semi-spherical depressions with raised edges.

TL;DR: The biodegradability of PHBV containing 3 mol% of hydroxyvalerate (HV) was tested under composting conditions on both a pilot and a laboratory scale and it was found that the biodegradation behavior ofPHBV in the pilot-scale composting Conditions was similar with that in the laboratory-scale.

TL;DR: In this paper, the shape of a cruciform type specimen under biaxial loading conditions is optimized using a numerical optimisation technique (sequential quadratic programming or SQP) coupled with a parametrically built finite element model (FEM) to concentrate and initiate damage in the center and achieve a uniform strain field by varying the geometrical characteristics of the specimen.

TL;DR: In this article, the same frequency and temperature using quasi-isothermal conditions in both instruments were compared with three different polymer samples and it was found that when choosing a suitable response parameter, i.e. the phase angle, the dynamic glass transition temperature values obtained by both methods are practically the same.

TL;DR: In this article, the effects of palm ash/halloysite nanotube weight ratio on the curing characteristics, tensile properties and morphology of the hybrid composites were studied, which indicated that HNTs has better adhesion to the EPDM matrix as compared to palm ash.

TL;DR: In this article, a finite element analysis was performed on double cantilever beam (DCB) specimens composed by quasi-homogeneous and uncoupled multidirectional (MD) laminates using 16 or 26-ply composite materials.

TL;DR: In this paper, the non-isothermal crystallization kinetics of polypropylene/silicon nitride (PP/Si3N4) nanocomposites were investigated.

TL;DR: In this paper, the authors apply digital image correlation (DIC) to study the strain behavior of glassy polymer networks in uniaxial compression, and obtain an accurate yield strain.

TL;DR: In this paper, a dynamic vulcanization process involving dicumyl peroxide and N,N′-m-phenylene-bis-maleimide (BMI) was applied to thermoplastic elastomer blends.

TL;DR: In this paper, the authors used dynamic scanning calcorimetry (DSC) to estimate the heat capacity of a fully cured epoxy over a temperature range, under the prerequisite that vitrification takes place.

TL;DR: In this paper, the phase morphology and typical physical properties of the prepared samples were examined and the nano-filler 15A was intercalated and/or partially exfoliated in the blend when PE-MA or PP-MA was present.

TL;DR: In this article, the effect of dimensions (thickness to diameter ratio) on the specific energy absorption of each composite tube was studied, and the quasi-static test parameters such as the peak crush load, mean crush load and the specific energies absorption of all these composite tubes were compared.

TL;DR: In this article, two methods for uniaxial compression testing were investigated and compared using polypropylene as a model material and an overview of various parameters affecting compression test results was provided with particular emphasis on friction between the specimen and the compression plate.

TL;DR: In this article, the progress of the cure reaction of hydroxyl-terminated (poly)butadiene (HTPB) and isophorone diisocyanate (IPDI) to polyurethane is studied using low-field nuclear magnetic resonance relaxometry and near infrared spectroscopy.

TL;DR: In this paper, the effect of extrusion blow molding on barrier properties of a polylactic acid (PLA) matrix was investigated using a transmission electron microscopy (TEM).

TL;DR: In this paper, a polyimide-silica hybrid thin film (6FDA-6FpDA-4ABA/SiO2, PS) was synthesized from polyimides and colloidal silica.

TL;DR: In this paper, the authors investigated the contributions of cure shrinkage and postcure to residual strain development in a thermosetting polyurethane system suitable for resin infusion of thick composites using fibre Bragg gratings.

TL;DR: In this article, a numerical parametric study has been conducted to study the effect of the delamination on the failure patterns and the corresponding energy absorption using single layer and two layer shell elements.

TL;DR: In this paper, a series of uniaxial ratcheting experiments has been carried out on cold compaction polytetrafluoroethylene (PTFE) specimens.

TL;DR: In this article, the authors evaluated the crosslink densities of polybutadiene rubber in the presence of sulphur and accelerator in their composition and were vulcanized at 433 K at different times in order to obtain several network structures.

TL;DR: In this article, a non-contact laser technique was adopted to measure axial small strain of Kevlar® 129 fibers in a miniaturized tension Kolsky bar, which is necessary to determine the elastic response of the fibers.