High-Throughput Discovery of Structure−Mechanical Property
Polymer International 2018 653 DOI 10.1002/pi.5684. Kamila Gosz Józef Haponiuk Łukasz Piszczyk. The Influence of Substitution of a Phosphorus-Containing Polyol with the Bio-polyol on the Properties of Bio-based PUR/PIR Foams. Journal of Polymers and the Environment 2018 26 (9) . DOI 10.1007/s.
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Improving microcellular foamability of amorphous
Polymer Composites is the engineering and scientific journal serving the fields of reinforced plastics and polymer composites including research production processing and applications. This work introduces and investigates a synergistic approach to tailor microcellular morphology and physical properties of soft polymer foams by
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A multi-scale theoretical model for soft materials
terization is carried out by studying their mechanical response particularly by analyzing mechanical tests of different materials. Soft materials include granular materials colloidal suspensions glasses pastes emulsions foams polymer net-works cells and many others. Their applicability in civil engineering and in the
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Polymer–Clay Nanocomposite Foams Prepared Using Carbon
Oct 23 2003 · Poly(methylmethacrylate) and polystyrene–clay nanocomposites have been synthesized and exfoliated clay dispersion has been achieved (see Figure). Nanocomposite foams have been prepared using CO 2 as the foaming agent. Orders of magnitude increase in nucleation efficiency was accomplished by manipulation of clay dispersion and polymer–clay–CO 2 interaction.
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separation between soft and hard segments within PU foam nanocomposites. Keywords polyurethane foam nanocomposites formation structure 1 INTRODUCTION polymerisation and micro Polymer-layered silicate nanocomposites provide the potential for materials with significantly enhanced mechanical properties combined with reductions in
Chat OnlineDynamic Mechanical Behaviour of Polymer Materials
Nov 01 2016 · Song et al. reported the dynamic mechanical response of three polymer foam materials made by rigid polymethylene diisocyanate (PMDI) varied in density (310 kg/m 3 410 kg/m 3 and 550 kg/m 3) at strain rates as high as 3000/s and at temperatures ranging from 219 K to 347 K. The effects of material density strain rate and temperature on the
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Dynamic Mechanical Behaviour of Polymer Materials
Nov 01 2016 · Song et al. reported the dynamic mechanical response of three polymer foam materials made by rigid polymethylene diisocyanate (PMDI) varied in density (310 kg/m 3 410 kg/m 3 and 550 kg/m 3) at strain rates as high as 3000/s and at temperatures ranging from 219 K to 347 K. The effects of material density strain rate and temperature on the
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Effect of Stearic Acid and Titanate Coupling Agent
Aug 04 2018 · Surface modifications of calcium carbonate as filler in flexible polyurethane foams were investigated. In order to improve the dispersion and interfacial bonding between the calcium carbonate and polyurethane matrix the surface of calcium carbonate was modified using 0.5 wt stearic acid and 2.72 wt titanate coupling agent. The influence of modification on the surface of calcium carbonate
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Effect of Stearic Acid and Titanate Coupling Agent
Aug 04 2018 · Surface modifications of calcium carbonate as filler in flexible polyurethane foams were investigated. In order to improve the dispersion and interfacial bonding between the calcium carbonate and polyurethane matrix the surface of calcium carbonate was modified using 0.5 wt stearic acid and 2.72 wt titanate coupling agent. The influence of modification on the surface of calcium carbonate
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Electrical Properties of Different Polymeric Materials and
May 18 2016 · Organic polymers are stable at high temperatures have the ability to resist radiation high mechanical electrical stresses chemical attacks from the extreme environments . Polymeric materials have a low or high dielectric constant and it is directly related to the permittivity which is the ability of materials to polarize under the
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Improving microcellular foamability of amorphous
Polymer Composites is the engineering and scientific journal serving the fields of reinforced plastics and polymer composites including research production processing and applications. This work introduces and investigates a synergistic approach to tailor microcellular morphology and physical properties of soft polymer foams by
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Soft matter and nanotechnologySlideShare
Dec 05 2019 · The soft matters are soft because they have weak intermolecular forces weak electrical field and weak mechanical stress.
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SYNTHESIS and CHARACTERIZATION of NOVEL
Polyurethane dispersion samples were characterized by form of flexible or rigid foams elastomers thermoplastic sand fibers. physical/mechanical properties of the polymer. The increasing need to reduce the volatile organic compounds (VOC) and hazardous air pollutants (HAP) are becoming more and more important nowadays. The legislative
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USB1Polyurethane foam for shoe solesGoogle
Microcellular polyurethane elastomer shoe sole components having exceptional physical properties may be prepared from isocyanate-terminated prepolymers derived from polyoxypropylene diols having a molecular weight of from about 2000 Da to 8000 Da an unsaturation less than about 0.02 meq/g and a random oxyethylene content of from about 5 to about 15 weight percent.
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Effect of matrix−nanoparticle supramolecular interactions
Jan 12 2018 · Effect of matrix−nanoparticle supramolecular interactions on the morphology and mechanical properties of polymer foams. Seifollah Jamalpour. high cell density and high expansion ratio using a soft TEM images revealed that while strong inter‐filler supramolecular interactions do not have a positive effect on their dispersion state
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Ultralight Soft Polymer Sponges by Self‐Assembly of Short
Mar 30 2015 · Ultralight polymer sponges are prepared by freeze‐drying of dispersions of short electrospun fibers. In contrast to many other highly porous materials these sponges show extremely low densities (<3 mg cm −3) in combination with low specific surface areas.The resulting hierarchical pore structure of the sponges gives basis for soft and reversibly compressible materials and to hydrophobic
Chat OnlineFabrication and Characterisation of Polyurethane/Sepiolite
The sepiolite rods were incorporated into the foam matrix through the mechanical dispersion of the rods into a foam precursor to allow the in-situ polymerisation of the foam matrix and sepiolite nanofiller. Three different grades of sepiolite clay were explored with varying surface chemistry.
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(PDF) Study on Compressive Properties of Syntactic Foams
Generally core foams use a polymer resin such as epoxy resin cyanate ester polypropylene polysialate and vinyl ester as well as other polymer resins 11 as the matrix materials. Among all of
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SYNTHESIS and CHARACTERIZATION of NOVEL
Polyurethane dispersion samples were characterized by form of flexible or rigid foams elastomers thermoplastic sand fibers. physical/mechanical properties of the polymer. The increasing need to reduce the volatile organic compounds (VOC) and hazardous air pollutants (HAP) are becoming more and more important nowadays. The legislative
Chat OnlineHow to disperse and stabilize pigments
As the pigment powder is broken down to individual particles by mechanical shear higher surface areas become exposed to the vehicle and larger amounts of additives are required to wet out newly formed surfaces. Once dispersed the primary particles have a tendency to re-agglomerate. This process is called flocculation.
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Specific Mechanical Energy and Thermal Degradation of Poly
The compatibility of date pits (DP) with polylactic acid (PLA) or polycaprolactone (PCL) is investigated. Composites were prepared by compounding PLA or PCL with date pits at 10 20 30 and 40 wt/wt and extruded. Wheat vital gluten (VG) was also used as a filler and in combination with DP. The specific mechanical energy (SME) was calculated and the composites thermal properties were tested
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Reversible active switching of the mechanical properties
Reversible stabilization of air-in-water foam by AM1. (a) Foam was stable on standing for 10 min at pH 7.4. (b) It collapsed completely within 1 min after adding H 2 SO 4. (c) A new foam was prepared from the acidified solution but (d) it collapsed completely in 1 min. (e) The solution was neutralized with NaOH and a new foam was prepared.
Chat OnlinePolymer–Clay Nanocomposite Foams Prepared Using Carbon
Oct 23 2003 · Poly(methylmethacrylate) and polystyrene–clay nanocomposites have been synthesized and exfoliated clay dispersion has been achieved (see Figure). Nanocomposite foams have been prepared using CO 2 as the foaming agent. Orders of magnitude increase in nucleation efficiency was accomplished by manipulation of clay dispersion and polymer–clay–CO 2 interaction.
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Development of Flexible Polyurethane Nanostructured
This study examined the effect of organoclay montmorillonite (OMMT) on the mechanical properties and morphology of flexible polyurethane/OMMT nanocomposite (PU/OMMT) foams prepared from petroleum- and palm olein-based polyols. Palm-based PU foams exhibited inferior mechanical strength as compared to neat petroleum PU foams. However addition of OMMT significantly improved the foams
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Rheological Characterization of Carbopol® Dispersions in
(or network structure) is a mixture of tightly coiled linear polymer chains which are soluble in polar solvents. The viscosity of Carbopol solutions is not a function of the size of its powder particles 19 . It is well known that this polymer forms a colloidal dispersion when
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Biobased materials for polyurethane dispersions
The PU dispersion chemical composition chain length distribution and functionality type plays a vital role in mechanical properties thermal properties chemical resistance water resistance and also in morphology of dispersions. PU dispersions polymeric backbone chains divided into soft
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How to disperse and stabilize pigments
As the pigment powder is broken down to individual particles by mechanical shear higher surface areas become exposed to the vehicle and larger amounts of additives are required to wet out newly formed surfaces. Once dispersed the primary particles have a tendency to re-agglomerate. This process is called flocculation.
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Specific Mechanical Energy and Thermal Degradation of Poly
The compatibility of date pits (DP) with polylactic acid (PLA) or polycaprolactone (PCL) is investigated. Composites were prepared by compounding PLA or PCL with date pits at 10 20 30 and 40 wt/wt and extruded. Wheat vital gluten (VG) was also used as a filler and in combination with DP. The specific mechanical energy (SME) was calculated and the composites thermal properties were tested
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(PDF) Study on Compressive Properties of Syntactic Foams
Generally core foams use a polymer resin such as epoxy resin cyanate ester polypropylene polysialate and vinyl ester as well as other polymer resins 11 as the matrix materials. Among all of
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Influence of nano-hydroxyapatite on mechanical behavior of
Jun 12 2019 · Polycaprolactone (PCL) is a biodegradable polymer with good mechanical properties which is used for packaging bone scaffold and acoustic applications as foam material 4 5 . The PCL received huge success in industrial and consumer applications since 1931 due to its less weight high flexibility high thermal insulation and high moisture
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