An electrospinning process was successfully used to fabricate polyethylene oxide/cellulose nanocrystal (PEO/CNC) composite nanofibrous mats. Transition of homogeneous heterogeneous microstructures achieved by tailoring the concentration PEO/CNC mixture in solution from 5 7 wt %. Morphology investigation obtained nanofibers demonstrated that rod-shaped CNCs were well-dispersed as-spun and highly aligned along nanofiber long-axis. became more uniform smaller diameter with increased CNC-loading...

Effective removal of oils from water is global significance for environmental protection. In this study, we investigate the hydrophobicity and oleophilicity open-cell polymer foams prepared in a continuous scalable extrusion process. The material used to prepare fibrillar blend polypropylene (PP) polytetrafluoroethylene (PTFE). Scanning electron microscopy (SEM) images morphology PP/PTFE reveal that PTFE has PP matrix. SEM micrograph extruded foam shows formation an interconnected structure....

As electronic devices become increasingly miniaturized, their thermal management becomes critical. Efficient heat dissipation guarantees optimal performance and service life. Graphene nanoplatelets (GnPs) have excellent properties that show promise for use in fabricating commercial polymer nanocomposites with high conductivity. Herein, an industrially viable technique manufacturing a new class of lightweight GnP-polymer conductivity is presented. Using this method, GnP-high-density...

The requirement of energy efficiency demands materials with superior thermal insulation properties. Inorganic aerogels are excellent insulators, but difficult to produce on a large-scale, mechanically brittle, and their structural properties depend strongly density. Here, we report the scalable generation low-density, hierarchically porous, polypropylene foams using industrial-scale foam-processing equipment, conductivity lower than that commercially available high-performance insulators...

Dielectric polymer nanocomposites with high dielectric constant (ε′) and low loss (tan δ) are extremely desirable in the electronics industry. Percolative polymer–graphene nanoplatelet (GnP) composites have shown great promise as materials for high-performance capacitors. Herein, an industrially-viable technique manufacturing a new class of ultralight composite foams using commercial GnPs excellent performance is presented. Using this method, high-density polyethylene (HDPE)–GnPs...

This paper presents a new nano-fibrillation method to produce highly expanded microcellular polypropylene (PP) foams with high thermal insulation properties. Polybutylene terephthalate (PBT) nano-fibrils were formed in the PP matrix through melt spinning process increase foamability of resins which have inherently low strength. In this process, two immiscible polymer phases are extruded and drawn into fibers. fiber composite, PBT nano-fibrillar reinforcement phase typically has an average...

Abstract Foams with open‐cell structures have improved sound absorption abilities over conventional closed‐cell foams. One technique to optimize the acoustic of foams is control their cellular properties through manipulation processing parameters. This article presents a novel process synthesize polymeric for applications. The combined rotational foam molding and particulate leaching produce networks that are desirable absorption. Open‐cell open‐porosity about 0.90 were successfully...

In recent years, the mold-opening foam injection molding technology has received great attention as a breakthrough for production of low density and open-cell foams three-dimensional geometries. Despite earlier studies, there been little investigation on control foaming temperature this manufacturing process. To help understand mechanisms behind technology, paper presents numerical approach to simulate cooling polymer/gas mixture inside mold cavity, thereby, estimating The material cavity...

Abstract We investigated the effect of polydimethylsiloxane (PDMS) on foaming properties block‐copolymerized polypropylene (B‐PP) by blending different contents PDMS with B‐PP in extrusion process using supercritical CO 2 as blowing agent. The experimental results indicate that addition greatly increased expansion ratio foamed samples. At same time, cell population density foams obtained from blends also to a certain degree and provided new perspective improving B‐PP's performance. decreased...

The creation and application of PET nanofibrils for PP composite reinforcement were studied. fibrillated within a matrix using spunbond process then injection molded to test the end-use properties. nanofibril helped provide higher tensile flexural performance in solid (unfoamed) parts. With foam molding, also improve refine microcellular morphology, which led improved performance. Easily effectively increasing strength polymeric is goal many research endeavors. By creating nanoscale fibrils...

Synthetic open-cell polymer foams are promising materials for the treatment of oil sands process-affected water due to their oleophilic and hydrophobic properties. This paper presents characterization inexpensive accessible polyester polyurethane foam this application. The kinetics adsorption equilibrium emulsified onto adsorbent were studied at temperatures ranging from 20°C 40°C volume fractions in oil-in-water emulsions 3% 10%. data found be well described by a sequential dual Fickian...

Microcellular polypropylene/polystyrene/nanoclay (PP/PS/nanoclay) composites were processed in a continuous extrusion foaming system using supercritical CO 2 as the agent. Neat PP foam showed quite broad distribution of cell sizes and thick walls. Under same conditions, nanoclay PS introduced process PP. Consequently, foams with uniform size distribution, reduced 10~30 μm enhanced cell-population density 2.16×10 8 cells/cm 3 obtained. The heterogeneous nucleation dramatically increased rate,...

We investigate a generalized Hele–Shaw equation with source and drift terms where the density is constrained by an upper-bound constraint that varies in space time. By using porous medium approximation, we are able to construct weak solution equations under mild assumptions. Then establish uniqueness of solutions equations. Our next main result pointwise characterization variable when system congestion case. To obtain such for case, derive new uniform lower bounds on time derivative pressure...

Open‐cell foams are with porous, interconnected cellular structure. This unique structure has given open‐cell the versatility to be used in different types of applications including acoustics, filtration, membranes, and bioscaffolds. Conventional polymer comprise mainly thermosetting and/or crosslinked materials; such materials difficult process have limited end‐product recyclability. article presents a commercially viable molding fabricate using noncrosslinked thermoplastic polypropylene...

Abstract Recently, several companies have started to use the foaming technology in blow molding processes, primarily extrusion molding. Despite design complexity involved preform method, substantial advantages result when microcellular and are combined. In molding, (i. e., parison) undergoes significant biaxial stress during inflation stage. Since either extensional or shear can dramatically improve cell nucleation, an externally applied cause small-scale, local pressure variations...

A new class of thermally conductive microcellular polymer nanocomposites graphene nanoplatelets (GnP) is reported. Foamed and solid high-density-polyethylene (HDPE)-GnP composites containing different GnP contents (0-18 vol.%) were injection-molded. fabricated using a facile technique melt mixing followed by supercritical fluid-treatment physical foaming in an injection molding process. The effects on the dispersion, exfoliation, orientation inter-connectivity platelets, heat dissipation...

We investigate a generalized Hele-Shaw equation with source and drift terms where the density is constrained by an upper-bound constraint that varies in space time. By using porous medium approximation, we are able to construct weak solution equations under mild assumptions. Then establish uniqueness of solutions equations. Our next main result pointwise characterization variable when system congestion case. To obtain such for case, derive new uniform lower bounds on time derivative pressure...

Particles traveling through inertial microfluidic devices migrate to focusing streamlines. We present a numerical method that calculates migration velocities of particles in channels arbitrary cross section by representing singularities. Refinements asymptotic analysis are given improve the regularity singularity approximation, making finite element approximations flow and pressure fields more effective. Sample results demonstrate is computationally efficient able capture bifurcations...