Showing papers in "Polymer in 2007"

TL;DR: In this paper, an epoxy resin, cured with an anhydride, has been modified by the addition of silica nanoparticles, and the measured modulus was compared to theoretical models, and good agreement was found.

TL;DR: In this article, the effects of 13 material and operating parameters on electrospun fiber diameters are determined by varying the parameter values in an electrospinning theoretical model, and the results show that the five parameters (volumetric charge density, distance from nozzle to collector, initial jet/orifice radius, relaxation time, and viscosity) have the most significant effect on the jet radius.

TL;DR: In this article, different strategies to promote PLA crystallization were investigated with the objective of increasing the crystalline content under typical polymer processing conditions, and the effect of heterogeneous nucleation was assessed by adding talc, sodium stearate and calcium lactate as potential nucleating agents.

TL;DR: In this paper, the intrinsic potential of carbon nanotubes as reinforcing filler in elastomeric materials is demonstrated, despite a poor dispersion, small filler loadings improve substantially the mechanical and electrical behaviors of the soft matrix.

TL;DR: In this article, a kind of spherical cellulose nanocrystals was prepared by hydrolysis of microcrystalline cellulose with mixed acid and two methods were used: diminishing the acid sulfate groups by desulfation and neutralizing them by using NaOH solution.

TL;DR: In this article, the authors investigated the properties and interfacial modification of blends of polylactide (PLA) and glycerol-plasticized thermoplastic starch (TPS).

TL;DR: In this article, the authors investigated the influence of microcapsule diameter and crack size on the performance of self-healing materials and found that the amount of liquid that microcapsules deliver to a crack face is shown to scale linearly with micro-capule diameter for a given weight fraction of capsules.

TL;DR: In this article, a comparison of the breadth of the distributions between mats with differing average fiber diameters indicates that the dependence of breadth with average fiber diameter is not universal (i.e., it is material dependent).

TL;DR: In this article, the effect of silica nanoparticles on the morphology and the rheological properties of an immiscible polymer blend (polypropylene/polystyrene, PP/PS 70/30) was investigated.

TL;DR: In this article, a review of recent work on the preparation, characterization and application of "smart" microgel particles is presented, which are composed of a PS core and a cross-linked poly(N-isopropylacrylamide) (PNIPA) shell.

TL;DR: In this article, the authors compared the nano-sized precipitated calcium carbonate (NPCC) and organically modified montmorillonite (MMT) clay with PLA nanocomposites by melt extrusion.

TL;DR: In this paper, the authors have demonstrated that the hydrogel hybrid with different sizes of silver nanoparticles can be effectively employed as antibacterial material, which can be used as a carrier via in situ reduction of silver nitrate in the presence of sodium borohydride as a reducing agent.

TL;DR: The morphology, polymorphism behavior and molecular orientation of electrospun poly(vinylidene fluoride) (PVDF) fibers have been investigated in this article, where electrospinning of PVDF from its N,N-dimethylformamide/acetone solutions led to the formation of β-phase.

TL;DR: In this paper, the authors present a more complete picture of the mechanisms that govern emulsion polymerization systems, including the entry and exit of aqueous-phase radical species.

TL;DR: In this article, the uniaxial compression stress-strain behavior of polyurea and polyurethane over a wide range in strain rates, from 0.001−s−1 to 10,000 s−1, was reported.

TL;DR: In this paper, the elastic modulus of highly elastic magnetic elastomers has been studied by three different experimental techniques: elongation, static and dynamic shears, and it has been shown that the material elasticity increases considerably in an external homogeneous magnetic field of up to 0.3 T (100-fold increase of the tangential modulus has been observed at small 1-4% deformations).

TL;DR: In this paper, multi-walled carbon nanotubes (MWNTs) were modified with poly(hexamethylene adipamide) via a controlled polymer solution crystallization method, and a "nanohybrid shish kebab" structure was found wherein the MWNT resembled the shish while Nylon 66 lamellar crystals formed the kebabs.

TL;DR: In this article, a viscosity-reducing additive was used to reduce the diameter of polypropylene fibers to 840 −± −190nm by using the gap method of alignment for collection.

TL;DR: In this article, the effect of the compatibilizers on the clay dispersion and clay amount on the microstructure and physical properties of the nanocomposites were investigated.

TL;DR: In this paper, a drop weight test instrument was used to measure tensile tensile data for an elastomeric polyurea in uniaxial tension over a range of strain rates from 0.06 to 573 ǫ s−1.

TL;DR: In this paper, the authors used halloysite nanotubes from a clay mineral with the empirical formula Al 2 Si 2 O 5 (OH) 4 for epoxy-based nanocomposites.

TL;DR: In this article, the tensile properties of PEEK 450G have been extensively investigated and the Taylor impact properties were investigated as a function of velocity and various large-strain compression tests were undertaken to explain the results.

TL;DR: Curcumin-loaded CA fiber mats fabricated, for the first time, from the neat CA solution were proven non-toxic to normal human dermal fibroblasts and the integrity of the as-loaded curcumin was intact as indicated by the 1 H nuclear magnetic resonance spectrometric results.

TL;DR: In this article, a method of surface modification by grafting hydrophilic poly(ethylene glycol) (PEG) chains onto the surface of a thin-film composite polyamide reverse osmosis (RO) membrane was performed.

TL;DR: In this paper, a periodic amorphous structure of the cross-linked epoxy resin compound was constructed and it was simulated by continuous accumulation of structure configurations at various temperatures, based on the simulation results, glass transition temperature (Tg), linear thermal expansion coefficients and Young's modulus were predicted.

TL;DR: In this article, a super-hydrophobic polymethyl methacrylate (PMMA) film with CA of ∼154° was obtained by treating polystyrene (PS) and PMMA blended film in a warm selective solvent, cyclohexane.

TL;DR: In this paper, the authors summarize experimental developments in this field as well as theoretical background of capsule deformation with special attention to small deformation measurements, and introduce polyelectrolyte multilayer capsules as a case study, since they can be tailored in their geometry and composition and are thus well suited as a model system.

TL;DR: In this article, carboxylated and fluorinated nanotubes were used to synthesize nanocomposites by dispersing them separately in an epoxy resin and the resulting properties were analyzed using torsional deformation.

TL;DR: In this article, the synthesis of polymer-based monolithic materials is discussed, focusing on the aspects of controlling pore sizes, pore volumes and pore size distributions as well as functionalization of these supports.

TL;DR: In this paper, a melt blending method was used to enhance the compatibility between polylactide/multi-walled carbon nanotubes (PLA/MWNTs) hybrids by means of a melting blending method.