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Verdú Blasco Pau - One of the best experts on this subject based on the ideXlab platform.
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Filamentos elásticos de elastolefina de alta durabilidad obtenidos a partir de copolímeros de bloque de etileno-octeno de baja densidad mediante la tecnología de polimerización por transferencia de cadena para aplicaciones en indumentaria de uso profesional
Universitat Politècnica de Catalunya, 2010Co-Authors: Verdú Blasco PauAbstract:Premi extraordinari doctorat curs 2010-2011, àmbit d’Enginyeria Enginyeria IndustrialEn la actualidad el mercado carece de prendas elásticas para uso profesional puesto que los elastanos habitualmente utilizados son inestables frente a altas temperaturas y químicos agresivos, e.g. termofijado, mantenimiento de indumentaria industrial etc. Recientemente se han venido utilizado filamentos olefínicos obtenidos a partir de copolímeros al azar de etileno-octeno (Dow XLA™ fibers producidos por The Dow Chemical Company). Aunque más resistentes a las temperaturas debido a la reticulación, su bajo punto de fusión, alrededor de 50ºC, limita el comportamiento elástico en tejidos pesados y tupidos para indumentaria profesional. La investigación tiene por objeto la obtención de monofilamentos elásticos a partir copolímeros de bloque de etileno-octeno (cuyo punto de fusión es más elevado) y con éstos, tejidos para indumentaria profesional que ofrezcan mayor fuerza de encogimiento a las temperaturas típicas de los pre-tratamientos, tintura y acabado (50ºC-120ºC). El objetivo es hacer que los tejidos encojan más durante las operaciones en húmedo bajo temperatura para mejorar así su elasticidad y aumentar el peso en comparación con los tejidos actuales manufacturados con los convencionales copolímeros homogéneos de etileno-octeno reticulados Los tejidos deberán garantizar las siguientes propiedades durante todo su ciclo de vida: estabilidad dimensional, relación elasticidad-crecimiento mejorado, resistencia química, resistencia térmica, durabilidad ante los lavados industriales y un mejor confort termofisiológico y sensorial.Due to the lack of stability of elastane based materials against high temperatures and harsh chemicals, e.g. thermofixation and professional wear maintenance, elastic garments with elastane content are not yet fully commercial products. The Dow Chemical Company has recently commercialized a random ethylene-Octene copolymer based fiber named Dow XLA ™ fiber. Despite its higher temperature resistance as one of the crosslinking effects, its very low melting point, around 50ºC, establishes some limitations in elasticity such in heavy weight and high densely woven fabric cases typically found in professional wear applications. The target for the investigation is to produce block ethyleneOctene copolymer based filaments in which the melting point is supposed to be higher than in random copolymer materials. Different workwear fabrics will be manufactured with yarns containing such elastic filaments. It is supposed these fabrics to show high shrinkage forces even at dyeing and finishing temperatures, (50ºC-120ºC). The goal is to produce fabrics with superior shrinkage performance in order to achieve an excellent elastic power and the final desired fabric weight. Properties such as dimensional stability, stretch and growth ratio, temperature and chemical resistance and durability against industrial laundering should not be affected by the passage of the time. To validate this point these properties will be measured in the fabrics off loom and after the garment cycle life. These fabrics are also supposed to show better thermophysiological and sensorial properties than random copolymer fiber based textilesAward-winnin
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Filamentos elásticos de elastolefina de alta durabilidad obtenidos a partir de copolímeros de bloque de etileno-octeno de baja densidad mediante la tecnología de polimerización por transferencia de cadena para aplicaciones en indumentaria de uso profesional
Universitat Politècnica de Catalunya, 2010Co-Authors: Verdú Blasco PauAbstract:Premi extraordinari doctorat curs 2010-2011, àmbit d’Enginyeria Enginyeria IndustrialEn la actualidad el mercado carece de prendas elásticas para uso profesional puesto que los elastanos habitualmente utilizados son inestables frente a altas temperaturas y químicos agresivos, e.g. termofijado, mantenimiento de indumentaria industrial etc. Recientemente se han venido utilizado filamentos olefínicos obtenidos a partir de copolímeros al azar de etileno-octeno (Dow XLA™ fibers producidos por The Dow Chemical Company). Aunque más resistentes a las temperaturas debido a la reticulación, su bajo punto de fusión, alrededor de 50ºC, limita el comportamiento elástico en tejidos pesados y tupidos para indumentaria profesional. La investigación tiene por objeto la obtención de monofilamentos elásticos a partir copolímeros de bloque de etileno-octeno (cuyo punto de fusión es más elevado) y con éstos, tejidos para indumentaria profesional que ofrezcan mayor fuerza de encogimiento a las temperaturas típicas de los pre-tratamientos, tintura y acabado (50ºC-120ºC). El objetivo es hacer que los tejidos encojan más durante las operaciones en húmedo bajo temperatura para mejorar así su elasticidad y aumentar el peso en comparación con los tejidos actuales manufacturados con los convencionales copolímeros homogéneos de etileno-octeno reticulados Los tejidos deberán garantizar las siguientes propiedades durante todo su ciclo de vida: estabilidad dimensional, relación elasticidad-crecimiento mejorado, resistencia química, resistencia térmica, durabilidad ante los lavados industriales y un mejor confort termofisiológico y sensorial.Due to the lack of stability of elastane based materials against high temperatures and harsh chemicals, e.g. thermofixation and professional wear maintenance, elastic garments with elastane content are not yet fully commercial products. The Dow Chemical Company has recently commercialized a random ethylene-Octene copolymer based fiber named Dow XLA ™ fiber. Despite its higher temperature resistance as one of the crosslinking effects, its very low melting point, around 50ºC, establishes some limitations in elasticity such in heavy weight and high densely woven fabric cases typically found in professional wear applications. The target for the investigation is to produce block ethyleneOctene copolymer based filaments in which the melting point is supposed to be higher than in random copolymer materials. Different workwear fabrics will be manufactured with yarns containing such elastic filaments. It is supposed these fabrics to show high shrinkage forces even at dyeing and finishing temperatures, (50ºC-120ºC). The goal is to produce fabrics with superior shrinkage performance in order to achieve an excellent elastic power and the final desired fabric weight. Properties such as dimensional stability, stretch and growth ratio, temperature and chemical resistance and durability against industrial laundering should not be affected by the passage of the time. To validate this point these properties will be measured in the fabrics off loom and after the garment cycle life. These fabrics are also supposed to show better thermophysiological and sensorial properties than random copolymer fiber based textilesAward-winningPostprint (published version
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Filamentos elásticos de elastolefina de alta durabilidad obtenidos a partir de copolímeros de bloque de etileno-octeno de baja densidad mediante la tecnología de polimerización por transferencia de cadena para aplicaciones en indumentaria de uso profesional
Universitat Politècnica de Catalunya, 2010Co-Authors: Verdú Blasco PauAbstract:En la actualidad el mercado carece de prendas elásticas para uso profesional puesto que los elastanos habitualmente utilizados son inestables frente a altas temperaturas y químicos agresivos, e.g. termofijado, mantenimiento de indumentaria industrial etc. Recientemente se han venido utilizado filamentos olefínicos obtenidos a partir de copolímeros al azar de etileno-octeno (Dow XLA™ fibers producidos por The Dow Chemical Company). Aunque más resistentes a las temperaturas debido a la reticulación, su bajo punto de fusión, alrededor de 50ºC, limita el comportamiento elástico en tejidos pesados y tupidos para indumentaria profesional. La investigación tiene por objeto la obtención de monofilamentos elásticos a partir copolímeros de bloque de etileno-octeno (cuyo punto de fusión es más elevado) y con éstos, tejidos para indumentaria profesional que ofrezcan mayor fuerza de encogimiento a las temperaturas típicas de los pre-tratamientos, tintura y acabado (50ºC-120ºC). El objetivo es hacer que los tejidos encojan más durante las operaciones en húmedo bajo temperatura para mejorar así su elasticidad y aumentar el peso en comparación con los tejidos actuales manufacturados con los convencionales copolímeros homogéneos de etileno-octeno reticulados Los tejidos deberán garantizar las siguientes propiedades durante todo su ciclo de vida: estabilidad dimensional, relación elasticidad-crecimiento mejorado, resistencia química, resistencia térmica, durabilidad ante los lavados industriales y un mejor confort termofisiológico y sensorial.Due to the lack of stability of elastane based materials against high temperatures and harsh chemicals, e.g. thermofixation and professional wear maintenance, elastic garments with elastane content are not yet fully commercial products. The Dow Chemical Company has recently commercialized a random ethylene-Octene copolymer based fiber named Dow XLA™ fiber. Despite its higher temperature resistance as one of the crosslinking effects, its very low melting point, around 50ºC, establishes some limitations in elasticity such in heavy weight and high densely woven fabric cases typically found in professional wear applications. The target for the investigation is to produce block ethyleneOctene copolymer based filaments in which the melting point is supposed to be higher than in random copolymer materials. Different workwear fabrics will be manufactured with yarns containing such elastic filaments. It is supposed these fabrics to show high shrinkage forces even at dyeing and finishing temperatures, (50ºC-120ºC). The goal is to produce fabrics with superior shrinkage performance in order to achieve an excellent elastic power and the final desired fabric weight. Properties such as dimensional stability, stretch and growth ratio, temperature and chemical resistance and durability against industrial laundering should not be affected by the passage of the time. To validate this point these properties will be measured in the fabrics off loom and after the garment cycle life. These fabrics are also supposed to show better thermophysiological and sensorial properties than random copolymer fiber based textile
Joao B P Soares - One of the best experts on this subject based on the ideXlab platform.
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joint effect of poly ethyhlene co 1 Octene chain length and 1 Octene fraction on high temperature thermal gradient interaction chromatography
Macromolecular Chemistry and Physics, 2017Co-Authors: Abdulaal Z Alkhazaal, Joao B P SoaresAbstract:High-temperature thermal gradient interaction chromatography (HT-TGIC) fractionates polyolefins based on an adsorption–desorption mechanism. Several factors influence the shape and position of HT-TGIC chromatograms, notably polymer microstructure, analytical conditions, and, to a lesser extent, solvent type. This article investigates the joint influence of chain length and comonomer content of a series of polyethylene and ethylene/1-Octene copolymers having similar 1-Octene fractions (0–13 mol%) and a wide range of molecular weights on HT-TGIC fractionation. For each series of copolymers having similar 1-Octene fraction, the elution peak temperature decreases exponentially and the profiles become increasingly broader below a critical number average chain length value. The authors use Monte Carlo simulation and Stockmayer distribution to explain the observed behavior, finding that no simple correlation exists between ethylene sequences in the copolymers and peak elution temperature, but that there is strong evidence that axial dispersion is responsible for symmetrical broadening of the HT-TGIC profiles. The authors also study the HT-TGIC of binary blends, finding that components with similar 1-Octene contents and dissimilar chain lengths tend to increase co-adsorption/co-desorption effects.
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effect of solvent type on high temperature thermal gradient interaction chromatography of polyethylene and ethylene 1 Octene copolymers
Macromolecular Chemistry and Physics, 2015Co-Authors: Abdulaziz A Alghyamah, Joao B P SoaresAbstract:The effects of the solvent type and operation conditions on the high-temperature thermal gradient interaction chromatography (HT-TGIC) of ethylene homopolymers, ethylene–1-Octene copolymers, and their blends are investigated. While the HT-TGIC profiles of single polymers measured with 1,2,4-trichlorobenzene (TCB) and chloronaphthalene (CN) are similar, they are always narrower when o-dichlorobenzene (ODCB) is used, particularly for samples with lower 1-Octene fractions. Significant differences between the experimental and the calculated profiles of binary blends are observed with all three solvents, but better peak separation is seen when the ODCB is used. Having higher fractions of a 1-Octene-poor component in the blend causes a more significant distortion of the shape expected for the peak from the component with the higher 1-Octene fraction. The effect of the molecular weight on HT-TGIC profiles is also studied using samples with the same comonomer content and different molecular weights. Samples with low molecular weight have broader distributions and significant lower-temperature tails, particularly when TCB is used. Chain crystallization after adsorption effects may also play a minor role for low-comonomer samples. Finally, HT-TGIC profiles are compared with their equivalent crystallization elution fractionation (CEF) profiles. The HT-TGIC curves are broader than the equivalent CEF profiles, but these differences decrease as the comonomer content increases.
Abdulaal Z Alkhazaal - One of the best experts on this subject based on the ideXlab platform.
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joint effect of poly ethyhlene co 1 Octene chain length and 1 Octene fraction on high temperature thermal gradient interaction chromatography
Macromolecular Chemistry and Physics, 2017Co-Authors: Abdulaal Z Alkhazaal, Joao B P SoaresAbstract:High-temperature thermal gradient interaction chromatography (HT-TGIC) fractionates polyolefins based on an adsorption–desorption mechanism. Several factors influence the shape and position of HT-TGIC chromatograms, notably polymer microstructure, analytical conditions, and, to a lesser extent, solvent type. This article investigates the joint influence of chain length and comonomer content of a series of polyethylene and ethylene/1-Octene copolymers having similar 1-Octene fractions (0–13 mol%) and a wide range of molecular weights on HT-TGIC fractionation. For each series of copolymers having similar 1-Octene fraction, the elution peak temperature decreases exponentially and the profiles become increasingly broader below a critical number average chain length value. The authors use Monte Carlo simulation and Stockmayer distribution to explain the observed behavior, finding that no simple correlation exists between ethylene sequences in the copolymers and peak elution temperature, but that there is strong evidence that axial dispersion is responsible for symmetrical broadening of the HT-TGIC profiles. The authors also study the HT-TGIC of binary blends, finding that components with similar 1-Octene contents and dissimilar chain lengths tend to increase co-adsorption/co-desorption effects.
Abdulaziz A Alghyamah - One of the best experts on this subject based on the ideXlab platform.
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effect of solvent type on high temperature thermal gradient interaction chromatography of polyethylene and ethylene 1 Octene copolymers
Macromolecular Chemistry and Physics, 2015Co-Authors: Abdulaziz A Alghyamah, Joao B P SoaresAbstract:The effects of the solvent type and operation conditions on the high-temperature thermal gradient interaction chromatography (HT-TGIC) of ethylene homopolymers, ethylene–1-Octene copolymers, and their blends are investigated. While the HT-TGIC profiles of single polymers measured with 1,2,4-trichlorobenzene (TCB) and chloronaphthalene (CN) are similar, they are always narrower when o-dichlorobenzene (ODCB) is used, particularly for samples with lower 1-Octene fractions. Significant differences between the experimental and the calculated profiles of binary blends are observed with all three solvents, but better peak separation is seen when the ODCB is used. Having higher fractions of a 1-Octene-poor component in the blend causes a more significant distortion of the shape expected for the peak from the component with the higher 1-Octene fraction. The effect of the molecular weight on HT-TGIC profiles is also studied using samples with the same comonomer content and different molecular weights. Samples with low molecular weight have broader distributions and significant lower-temperature tails, particularly when TCB is used. Chain crystallization after adsorption effects may also play a minor role for low-comonomer samples. Finally, HT-TGIC profiles are compared with their equivalent crystallization elution fractionation (CEF) profiles. The HT-TGIC curves are broader than the equivalent CEF profiles, but these differences decrease as the comonomer content increases.
Zhuanzhuan Xie - One of the best experts on this subject based on the ideXlab platform.
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Continuous Hydroformylation with Phosphine-Functionalized Polydimethylsiloxane Rhodium Complexes as Nanofilterable Homogeneous Catalysts
2015Co-Authors: Zhuanzhuan Xie, Geoffrey R. Akien, Bibhas R. Sarkar, Bala Subramaniam, Raghunath V ChaudhariAbstract:Commercially available polydimethylsiloxane (PDMS) was functionalized with phosphine and used to form a Rh complex catalyst. The PDMS-based Rh catalyst complex shows promise as an inexpensive, readily synthesized and nanofilterable homogeneous catalyst for performing continuous hydroformylation. Batch hydroformylation of several substrates including 1-Octene, 1-decene, 1-dodecene and styrene showed good activity and selectivity. For 1-Octene hydroformylation, the observed catalyst activity with the PDMS-based Rh complex is 2-fold greater compared to that with a conventional Rh-triphenylphosphine complex under similar conditions. Continuous 1-Octene hydroformylation for up to 120 h was demonstrated in a membrane nanofiltration system, showing stable conversion (∼60%) and high chemoselectivity (>95%). The total turnover number (TON) after 120 h was approximately 12 000 and the permeate Rh concentration was
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solubilities of co and h2 in neat and co2 expanded hydroformylation reaction mixtures containing 1 Octene and nonanal up to 80 c and 90 bars
Journal of Chemical & Engineering Data, 2009Co-Authors: Zhuanzhuan XieAbstract:Accurate knowledge of the phase equilibria of CO2-expanded hydroformylation reaction mixtures is essential to rational process design and development. Vapor−liquid equilibria of the following systems were measured in a variable-volume view cell at temperatures ranging from (313.15 to 353.15) K and pressures up to 9 MPa: CO + 1-Octene, CO2 + 1-Octene, CO + 1-Octene + CO2, CO + nonanal, CO2 + nonanal, CO + nonanal + CO2, H2 + 1-Octene, H2 + 1-Octene + CO2, H2 + nonanal, and H2 + nonanal + CO2. The measured solubilities of CO and H2 in the liquid phases were consistent with literature values. The presence of CO2 was found to enhance the solubilities of both CO and H2 in the liquid phase. The enhancement factor is up to 1.54 for carbon monoxide and 1.82 for hydrogen. The Peng−Robinson equation of state (PR EoS) with van der Waals mixing rules and binary interaction parameters modeled the VLE data adequately, with much better fits for the 1-Octene systems compared to the more polar nonanal systems.
