The structure of nanocomposites produced by melt-mixing polypropylene and 5 wt % organically modified layered silicates with varying amounts different maleated compatibilizer grades has been analyzed X-ray diffraction, transmission electron microscopy (TEM), melt rheology. extent delamination in quantified from analysis several TEM images for each specimen a product the single particle volume fraction intrinsic viscosity such particles. This measure correlated directly low shear relative...

A transformation is derived to decouple the two differential equations describing one-dimensional acoustic wave propagation in presence of mean flow, mufflers with partitioned, perforated tubes. The following analysis leads compact and exact expressions for matrix parameters crossflow elements without any concern convergence infinite series or segmental employed earlier studies. present is, however, based on assumptions a uniform perforate impedance tube, equal flow ducts. predicted...

Abstract This work presents new results on using organoclay with an appropriate polymeric compatibilizer as rheology‐modifying additives for extrusion foaming of a linear polypropylene (PP), which by itself does not display strain hardening in extensional flow the melt. The uniaxial melt‐extensional viscosity behavior several nanocomposites prepared varying ratio bound maleic anhydride to clay well molecular weight was investigated. A chemical‐blowing agent used at fixed concentration these...

This paper presents the rheology and morphology of immiscible polymer blends compatibilized by a reaction at interface. Nylon-6 was melt blended in twin screw extruder with several different grades maleated polypropylene 10 20 wt %. The extent interface is varied varying maleation affects phase differently volume fractions. reactive fit to Palierne theory infer values equilibrium interfacial tension. tension reduced proportion polypropylene. In more product, another mechanical property...

We report a methodology developed to detect and track stable fluorescent-labeled nanoclay, in polymer-clay nanocomposite films, contact solvent after migration testing. Fluorescein-5-maleimide (fluorescein) or tetramethylrhodamine-5-maleimide (rhodamine) was covalently bonded organically modified montmorillonite (o-MMT). Fluorescein- rhodamine-labeled nanoclay showed good thermal stability up 220 °C the remained at 250 °C. Confocal laser scanning microscopy used confirm tagging nanoclays...

Straight-through concentric resonators have been modeled by coupling the acoustic wave propagation through inner perforated pipe and outer cavity means of radial particle velocity perforate holes. The decoupled equations are solved using boundary conditions in resulting a two-by-two transfer matrix. In this study decoupling procedure was used for deriving matrix partially straight-through resonator. This predicting transmission loss some typical resonator configurations. Experimental...

Abstract A continuation method has been used with a finite element grid and geometric perturbation to compute two successive symmetry breaking flow transitions increasing Reynolds number in of generalized Newtonian fluids through sudden planar expansion. With an expansion ratio 16, the onset is particularly sensitive small asymmetry critical numbers for are found be very close. These delayed higher by degree pseudoplasticity. This trend observed experimentally as well this work may...

Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation C. Chmielewski, K. Jayaraman; The effect of polymer extensibility on crossflow solutions through cylinder arrays. J. Rheol. 1 August 1992; 36 (6): 1105–1126. https://doi.org/10.1122/1.550303 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar...

Abstract This paper reports an investigation of asynchronous flow marks on the surface injection molded parts and short shots made from two different blends polypropylene ethylene–propylene random copolymer elastomers. Flow were observed with both blends; spatial frequency was greater in blend B1, which also exhibited a contrast between regions. The same distinctly faster linear viscoelastic tests shear creep recovery viscosity growth. degree flow‐mark regions out‐of‐flow‐mark examined...

Abstract The high rate shear flow behavior and the morphology of five different oil‐extended polypropylene (PP)/ethylene‐propylene‐diene monomer (EPDM) thermoplastic vulcanizate blends were investigated with melt (MFR) PP varying from 0.7 to 20. ratio rubber is 70 : 30 in three vulcanizates (TPVs) 50 other two TPVs. distribution high‐temperature oil between a key parameter because this will affect viscosity PP/oil medium. object study was estimate matrix composition each TPVs at processing...

Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Bhaskar Patham, Krishnamurthy Jayaraman; Creep recovery of random ethylene-octene copolymer melts with varying comonomer content. Journal Rheology 1 September 2005; 49 (5): 989–999. https://doi.org/10.1122/1.2008296 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote...

An experimental study has been carried out to evaluate the influence of confinement ofalumina ceramic tiles through polymer restraint, on its ballistic performance. Tiles 99.5 per centpurity alumina were subjected impact against 7.62 mm armour piercing projectiles atvelocities about 820 m/s. The size 75 x 7 confined both facesby effectively bonding varying numbers layers fabrics. These then bondedto a 10 thick fibre glass laminate as backing using epoxy resin. High performance...

Abstract This paper provides experimental data and an analytical description for mass transfer of soluble thermoplastic binder from a fiber preform to the resin during nonisothermal filling in liquid molding processes. The variation concentration fill viscosity must be determined controlled. is because consequences wet‐out, deformation, development “fingering” flow patterns nonuniformities molded parts. Experimental washout curves have been obtained random continuous glass mat preforms with...

ABSTRACT The objective of the present work was to examine development crystalline orientation and texture in polypropylene matrix talc‐filled i‐PP unfilled with increasing draw ratio during solid‐phase die‐drawing at high strain rates (∼1 s −1 ) a die temperature 145 °C. After drawing, entire billet cooled rapidly “under tension” room before releasing cutting specimens from different axial locations for analysis. Orientation distributions three crystal axes strains have been presented as...

Abstract The melt flows of linear low‐density polyethylene (LLDPE) and branched (LDPE) have been compared in a fully intermeshing co‐rotating twin‐screw extruder. melts were selected order to investigate the effects rheology on mixing. Their shear vicosity curves are quite similar, but LDPE has markedly higher apparent extensional viscosity over wide range stretch rates. stagger paddles mixing zone extruder creates axial pressure‐driven flow can significant strain components. Residence time...

Polymer nanocomposites with layered silicates have two different types of interface sites: edges hydroxyl groups and gallery faces oxygen atoms. The polymer–particle at either site may be strengthened by silane coupling agents. objective this work was to investigate the morphology rheology in melt-compounded state reprocessed polypropylene-layered-silicate reactive a long chain polymeric compatibilizer sites. Two organically modified aspect ratios surfactants were treated an...

ABSTRACT This paper presents a nonlinear viscoelastic model for polymer nanocomposites and the computed response to large amplitude oscillatory shear flow. The predicts stress in mixture of entangled chains, with different convective constraint release (CCR) rates free chains nanoparticle‐attached through an averaging scheme which is consistent double reptation Marrucci–Ianniruberto constitutive equation. evaluated both numerically terms Q by asymptotic analysis four frequency dependent...

Abstract The consolidation and relaxation characteristics of glass mat reinforcements with a thermoplastic polyester binder have been studied. Attention has given to the effect preforming conditions on flow around fibers, rearrangement fiber tows making up preform. An instrumented hydraulic press was used compress stacks over wide range temperatures (51.7 176.7°C) platen closing speeds (0.02 2.00 mm/s). Scanning electron microscopy examine after deformation. Individual were observed flatten...