The Experts below are selected from a list of 60213 Experts worldwide ranked by ideXlab platform
Zhu Guanghe - One of the best experts on this subject based on the ideXlab platform.
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Polyurethane artificial leather anti flaming composition containing dmmp and preparation method
2017Co-Authors: Zhu GuangheAbstract:The invention relates to a Polyurethane artificial leather anti-flaming composition containing DMMP. The Polyurethane artificial leather anti-flaming composition is mainly prepared from the following ingredients in parts by mass: 60 to 80 parts of Polyurethane, 10 to 15 parts of the DMMP, 0.2 to 0.5 part of zinc powder and 5 to 25 parts of inorganic filler. A preparation method of the Polyurethane artificial leather anti-flaming composition comprises the following steps of melting and mixing the raw materials, extruding through a planet extruder and cooling, thus obtaining the Polyurethane artificial leather anti-flaming composition. Polyurethane artificial leather anti-flaming leather disclosed by the invention has the advantages of simple ingredients, no corrosion to equipment, environment friendliness and the like.
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Polyurethane artificial leather anti flaming composition containing tcep ttrichloroethyl phosphate and preparation method
2017Co-Authors: Zhu GuangheAbstract:The invention relates to a Polyurethane artificial leather anti-flaming composition containing TCEP (Ttrichloroethyl Phosphate). The Polyurethane artificial leather anti-flaming composition is mainly prepared from the following ingredients in parts by mass: 60 to 80 parts of Polyurethane, 10 to 15 parts of the TCEP, 0.2 to 0.5 part of zinc powder and 5 to 25 parts of inorganic filler. A preparation method of the Polyurethane artificial leather anti-flaming composition comprises the following steps of melting and mixing the raw materials, extruding through a planet extruder and cooling, thus obtaining the Polyurethane artificial leather anti-flaming composition. Polyurethane artificial leather disclosed by the invention has the advantages of simple ingredients, no corrosion to equipment, environment friendliness, and the like.
Ernst Jenckel - One of the best experts on this subject based on the ideXlab platform.
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Dynamisch-mechanische eigenschaften von Polyurethan. 2. Mitt. Der einfluß von quellungsmitteln auf das mechanische verhalten von Polyurethan
Macromolecular Chemistry and Physics, 2003Co-Authors: Von Herbert Jacobs, Ernst JenckelAbstract:Der Einflus verschiedenartiger niedrigmolekularer Quellungsmittel auf die mechanischen Eigenschaften von Polyurethan wurde in einem Temperaturbereich von −180°C bis etwa 50°C oberhalb der Glastemperatur mit Hilfe von freien Torsionsschwingungen bei konstanter Frequenz von 1 Hz untersucht. Wahrend man bei ungequollenem Material nur zwei Relaxationsgebiete beobachtet (α-Maximum bei etwa +40°C und α-Maximum bei etwa −135°C), erscheint bei Quellungsmittelzusatz ein drittes Relaxationsgebiet bei etwa −70°C (β-Maximum). Die Temperaturlage des α-Maximums verschiebt sich mit steigender Konzentration an Quellungsmittel zu tieferen Temperaturen. (Das ist gleichbedeutend mit einer Erniedrigung der Glastemperatur.) Diese Erniedrigung ist bei allen untersuchten Systemen – mit Ausnahme des Systems Polyurethan/Wasser – dieselbe, wenn man die Konzentration des Quellungsmittels im Grundmolenbruch angibt. Auf Grund dieser Mesergebnisse werden Ruckschlusse auf die Art der Bindung der Quellungsmittelmolekule im Polymeren gezogen. The influence of various low-molecular solvents on the dynamic mechanical properties of Polyurethane has been studied over a temperature range extending from −180°C. up to about 50°C. above the glass transition using a torsional pendulum at constant frequency of 1 cps. In dry specimens the temperature dependence of the mechanical loss factor tg δ and also of the imaginary part G″ of the complex dynamic modulus shows two maxima: α-maximum at +40°C. and β-maximum at −135°C. In swollen Polyurethane there is a third maximum at −70°C. (β-maximum). The glass temperature, Tg, decreases with increasing content of solvent. Besides of the system Polyurethane/water, all investigated solvents show the same lowering of Tg when the concentration of the solvent is marked in base mole fraction. Molecular considerations due to these results are given.
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Dynamisch-mechanische eigenschaften von Polyurethan. 1. Mitt. Mechanisches verhalten von Polyurethan in abhängigkeit von der chemischen konstitution und der thermischen vorgeschichte†
Macromolecular Chemistry and Physics, 2003Co-Authors: Von Herbert Jacobs, Ernst JenckelAbstract:Die dynamisch-mechanischen Eigenschaften von verschiedenen Polyurethanen wurden durch Messung des mechanischen Verlustfaktors tg δ und des Real- und Imaginarteils des komplexen Schubmoduls G' und G'; mit Hilfe eines Torsionspendels in einem Temperaturbereich von —180°C bis zum Schmelzpunkt untersucht. Bei scharf getrockneten Proben zeigen sich Relaxationsgebiete bei etwa —135°C und bei +40°C. Durch Verlangerung der CH2-Kette zwischen den Urethangruppen verschiebt sich die Temperaturlage der Dampfungsmaxima, vornehmlich des Hauptmaximums, zu tieferen Temperaturen. Der Einflus der thermischen Vorgeschichte auf das Dampfungsverhalten wurde untersucht. Bei isothermen Messungen an abgeschrecktem Polyurethan in Abhangigkeit von der Zeit konnten zwei unterschiedliche Geschwindigkeiten der Kristallisation beobachtet werden. The dynamic-mechanical properties of several types of Polyurethane have been studied over a temperature range extending from about —180°C. to near the melting point by measuring the mechanical loss factor tg δ, and the moduli G' and G' using a torsional pendulum at constant frequency of 1 cps. The temperature positions of the damping maxima depend on the length of the CH2-chain between the urethane groups. So they decrease with increasing number of C atoms. Furthermore the damping depends on the thermal history. The dynamic-mechanical behaviour due to the effects of crystallinity motion are given.
Muthu Jayabalan - One of the best experts on this subject based on the ideXlab platform.
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Development of segmented Polyurethane elastomers with low iodine content exhibiting radiopacity and blood compatibility
Biomedical Materials, 2011Co-Authors: S Dawlee, Muthu JayabalanAbstract:Biofunctionally active and inherently radiopaque polymers are the emerging need for biomedical applications. Novel segmented Polyurethane elastomer with inherent radiopacity was prepared using aliphatic chain extender 2,3-diiodo-2-butene-1,4-diol, polyol polytetramethylene glycol and 4,4'-methylenebis(phenyl isocyanate) (MDI) for blood compatible applications. Aliphatic Polyurethane was also prepared using hexamethylene diisocyanate for comparison. X-ray analysis of the Polyurethanes revealed good radiopacity even at a relatively low concentration of 3% iodine in aromatic Polyurethane and 10% in aliphatic Polyurethane. The Polyurethanes also possessed excellent thermal stability. MDI-based Polyurethane showed considerably higher tensile strength than the analogous HDI-based Polyurethane. MDI-based aromatic Polyurethane exhibited a dynamic surface morphology in aqueous medium, resulting in the segregation of hydrophilic domains which was more conducive to anti-thrombogenic properties. The Polyurethane was cytocompatible with L929 fibroblast cells, non-hemolytic, and possessed good blood compatibility.
Kyung Wha Oh - One of the best experts on this subject based on the ideXlab platform.
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Effect of castor oil/polycaprolactone hybrid polyols on the properties of bioPolyurethane
Macromolecular Research, 2015Co-Authors: Kyung Kyu Choi, Sang Ho Park, Kyung Wha OhAbstract:Organic solvent soluble castor oil/polycaprolactone diol (PCL) based Polyurethane for artificial leather was prepared by a one-step polymerization with 4,4′-diphenylmethane diisocyanate (MDI) at different castor oil contents. The PCL and MDI acted as soft and hard segments, respectively, and the castor oil acted as a dendritic point in the castor oil/PCL based Polyurethane structure. The tensile properties and shape memory of castor oil/PCL based Polyurethane were enhanced remarkably, compared with the PCL based Polyurethane because of the increased hard segment portion and crosslinking density by the three urethane bonds formed per molecule in the castor oil/PCL mixed system. The dynamic mechanical analysis showed that the storage modulus of castor oil/PCL based Polyurethanes increased with increasing castor oil content. In the enzymatic degradation test, castor oil/PCL based Polyurethane degraded faster than conventional petroleum based Polyurethane. This research suggests the potential to use the castor oil/PCL based Polyurethane as a biobased coating materials. Open image in new window
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Effect of castor oil/polycaprolactone hybrid polyols on the properties of bioPolyurethane
Macromolecular Research, 2015Co-Authors: Kyung Kyu Choi, Sang Ho Park, Kyung Wha Oh, Seong Hun KimAbstract:Organic solvent soluble castor oil/polycaprolactone diol (PCL) based Polyurethane for artificial leather was prepared by a one-step polymerization with 4,4′-diphenylmethane diisocyanate (MDI) at different castor oil contents. The PCL and MDI acted as soft and hard segments, respectively, and the castor oil acted as a dendritic point in the castor oil/PCL based Polyurethane structure. The tensile properties and shape memory of castor oil/PCL based Polyurethane were enhanced remarkably, compared with the PCL based Polyurethane because of the increased hard segment portion and crosslinking density by the three urethane bonds formed per molecule in the castor oil/PCL mixed system. The dynamic mechanical analysis showed that the storage modulus of castor oil/PCL based Polyurethanes increased with increasing castor oil content. In the enzymatic degradation test, castor oil/PCL based Polyurethane degraded faster than conventional petroleum based Polyurethane. This research suggests the potential to use the castor oil/PCL based Polyurethane as a biobased coating materials.
Kyung Kyu Choi - One of the best experts on this subject based on the ideXlab platform.
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Effect of castor oil/polycaprolactone hybrid polyols on the properties of bioPolyurethane
Macromolecular Research, 2015Co-Authors: Kyung Kyu Choi, Sang Ho Park, Kyung Wha OhAbstract:Organic solvent soluble castor oil/polycaprolactone diol (PCL) based Polyurethane for artificial leather was prepared by a one-step polymerization with 4,4′-diphenylmethane diisocyanate (MDI) at different castor oil contents. The PCL and MDI acted as soft and hard segments, respectively, and the castor oil acted as a dendritic point in the castor oil/PCL based Polyurethane structure. The tensile properties and shape memory of castor oil/PCL based Polyurethane were enhanced remarkably, compared with the PCL based Polyurethane because of the increased hard segment portion and crosslinking density by the three urethane bonds formed per molecule in the castor oil/PCL mixed system. The dynamic mechanical analysis showed that the storage modulus of castor oil/PCL based Polyurethanes increased with increasing castor oil content. In the enzymatic degradation test, castor oil/PCL based Polyurethane degraded faster than conventional petroleum based Polyurethane. This research suggests the potential to use the castor oil/PCL based Polyurethane as a biobased coating materials. Open image in new window
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Effect of castor oil/polycaprolactone hybrid polyols on the properties of bioPolyurethane
Macromolecular Research, 2015Co-Authors: Kyung Kyu Choi, Sang Ho Park, Kyung Wha Oh, Seong Hun KimAbstract:Organic solvent soluble castor oil/polycaprolactone diol (PCL) based Polyurethane for artificial leather was prepared by a one-step polymerization with 4,4′-diphenylmethane diisocyanate (MDI) at different castor oil contents. The PCL and MDI acted as soft and hard segments, respectively, and the castor oil acted as a dendritic point in the castor oil/PCL based Polyurethane structure. The tensile properties and shape memory of castor oil/PCL based Polyurethane were enhanced remarkably, compared with the PCL based Polyurethane because of the increased hard segment portion and crosslinking density by the three urethane bonds formed per molecule in the castor oil/PCL mixed system. The dynamic mechanical analysis showed that the storage modulus of castor oil/PCL based Polyurethanes increased with increasing castor oil content. In the enzymatic degradation test, castor oil/PCL based Polyurethane degraded faster than conventional petroleum based Polyurethane. This research suggests the potential to use the castor oil/PCL based Polyurethane as a biobased coating materials.