The Experts below are selected from a list of 155610 Experts worldwide ranked by ideXlab platform
Valentin Victor Jerca - One of the best experts on this subject based on the ideXlab platform.
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poly 2 cycloalkyl 2 oxazoline s high Melting Temperature polymers solely based on debye and keesom van der waals interactions
2016Co-Authors: Valentin Victor Jerca, Kathleen Lava, Bart Verbraeken, Richard HoogenboomAbstract:The synthesis of new 2-cycloalkyl-2-oxazoline monomers, namely 2-cyclobutyl (cBuOx), 2-cyclopentyl (cPentOx) and 2-cyclohexyl-2-oxazoline (cHexOx) is described. Their microwave-assisted cationic ring-opening polymerisation allowed the synthesis of well-defined homopolymers. The resulting homopolymers are crystalline and have high chemical resistance to organic solvents. The highest Melting point was registered for cPentOx (306 °C), followed by cHexOx (251 °C) and cBuOx (243 °C). The crystal structure of the homopolymers was put into evidence by X-ray diffraction and appeared to be similar to that of the poly(2-isopropyl-2-oxazoline). The absence of any hydrogen bonding or π–π interactions, makes these compounds a special class of high performance polymers which possess high Tm solely based on Debye and Keesom van der Waals interactions of the side-chains. The copolymerization of cPentOx with 2-ethyl-2-oxazoline (EtOx) and cBuOx, respectively are also reported indicating the formation of near ideal random copolymers. Furthermore, the copolymers of cPentOx with cBuOx with compositions in the range from 0 to 100% revealed a linear dependence of Melting Temperature with the weight fraction of comonomer. For cPentOx-EtOx copolymers containing up to 25 wt% EtOx a linear decrease of the Melting Temperature with composition was registered, most likely due to the disturbance of the cPentOx crystalline domains. Further, increasing the EtOx wt% revealed a complex non-linear dependence of glass transition Temperature on composition, whereby the glass transition Temperature of some copolymers was lower than for pure PEtOx.
Richard Hoogenboom - One of the best experts on this subject based on the ideXlab platform.
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poly 2 cycloalkyl 2 oxazoline s high Melting Temperature polymers solely based on debye and keesom van der waals interactions
2016Co-Authors: Valentin Victor Jerca, Kathleen Lava, Bart Verbraeken, Richard HoogenboomAbstract:The synthesis of new 2-cycloalkyl-2-oxazoline monomers, namely 2-cyclobutyl (cBuOx), 2-cyclopentyl (cPentOx) and 2-cyclohexyl-2-oxazoline (cHexOx) is described. Their microwave-assisted cationic ring-opening polymerisation allowed the synthesis of well-defined homopolymers. The resulting homopolymers are crystalline and have high chemical resistance to organic solvents. The highest Melting point was registered for cPentOx (306 °C), followed by cHexOx (251 °C) and cBuOx (243 °C). The crystal structure of the homopolymers was put into evidence by X-ray diffraction and appeared to be similar to that of the poly(2-isopropyl-2-oxazoline). The absence of any hydrogen bonding or π–π interactions, makes these compounds a special class of high performance polymers which possess high Tm solely based on Debye and Keesom van der Waals interactions of the side-chains. The copolymerization of cPentOx with 2-ethyl-2-oxazoline (EtOx) and cBuOx, respectively are also reported indicating the formation of near ideal random copolymers. Furthermore, the copolymers of cPentOx with cBuOx with compositions in the range from 0 to 100% revealed a linear dependence of Melting Temperature with the weight fraction of comonomer. For cPentOx-EtOx copolymers containing up to 25 wt% EtOx a linear decrease of the Melting Temperature with composition was registered, most likely due to the disturbance of the cPentOx crystalline domains. Further, increasing the EtOx wt% revealed a complex non-linear dependence of glass transition Temperature on composition, whereby the glass transition Temperature of some copolymers was lower than for pure PEtOx.
Takashi Hirosawa - One of the best experts on this subject based on the ideXlab platform.
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burnup dependence of Melting Temperature of fbr mixed oxide fuels irradiated to high burnup
2011Co-Authors: Takashi Hirosawa, Isamu SatoAbstract:Abstract The Melting Temperatures of FBR MOX fuels with Pu content of 28–30 wt.% irradiated to from 22.5 to 112.5 MWd kg−1 were measured using a rhenium inner capsule to hold the specimens. The rhenium inner capsule could prevent chemical reactions between fuels and tungsten materials which decrease the Melting Temperature. The Melting Temperatures were about 30 K higher than the previous data using tungsten capsules. The Melting Temperature decreases in a linear manner with burnup due to solid solution of fission products in fuels. However, the slopes of the lines plotting Melting Temperature versus burnup are almost similar to the previous data.
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Melting Temperature of mixed oxide fuels for fast reactors
2002Co-Authors: Koichi Konno, Takashi HirosawaAbstract:Alternation of the Melting Temperature of irradiated mixed oxide (MOX) fuel in fast reactors with progress of burnup was determined in relation to the actinide fractions contained and of the oxygen-to-metal (O/M) ratio. Based on ideal solution models of UO2-PuO2 and UO2-PuO2-Am2O3 systems and on correlations obtained of the measured Melting with O/M ratio and with burnup, an equation was derived expressing the estimated Melting Temperature T rev (K) as function of the factors mentioned above that affect the Temperature: where X 1 is the plutonium fraction (Pu/(Pu+U)), X 2 the americium fraction (Am/(Pu+U+Am)), X 3 the burnup (GWd/t), and X 4 the O/M ratio (-) (not exceeding 2.00). Toward advanced stage of burnup, the tendency of irradiated fuel Melting Temperature to lower with burnup progress presented a tendency to level off its rate of descent.
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Melting Temperature of simulated high burnup mixed oxide fuels for fast reactors
1999Co-Authors: Koichi Konno, Takashi HirosawaAbstract:The Melting (solidus) Temperatures were measured for fuel simulating burnups of 50, 90, 130, 170, 210 and 250 GWd/t (SIMFUEL) which were added non-radioactive soluble fission products (FPs) to unirradiated fast reactor MOX fuel. The Melting Temperatures for fuels of 250 GWd/t which were blended non-radioactive soluble FPs and irradiated fuels of 110.6 and 119.0 GWd/t were also compared to the SIMFUEL of 250 GWd/t. The Melting Temperature decrease of the SIMFUEL tended to saturate with increasing burnup and the Melting Temperatures appeared virtually constant above 170 GWd/t. An equation for Melting Temperature was obtained from the proposed equation in the previous report by revising the coefficient of the fifth term: where is the expected Melting Temperature (K), X 1 the plutonium fraction (Pu/(Pu+U)), X 2 the americium fraction (Am/(Pu+U+Am)), and X 3 the burnup (GWd/t). After the Temperature measurement, the radial distribution of eight FP oxide additives in SIMFUEL of 250 GWd/t was measured by X-ray m...
Kathleen Lava - One of the best experts on this subject based on the ideXlab platform.
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poly 2 cycloalkyl 2 oxazoline s high Melting Temperature polymers solely based on debye and keesom van der waals interactions
2016Co-Authors: Valentin Victor Jerca, Kathleen Lava, Bart Verbraeken, Richard HoogenboomAbstract:The synthesis of new 2-cycloalkyl-2-oxazoline monomers, namely 2-cyclobutyl (cBuOx), 2-cyclopentyl (cPentOx) and 2-cyclohexyl-2-oxazoline (cHexOx) is described. Their microwave-assisted cationic ring-opening polymerisation allowed the synthesis of well-defined homopolymers. The resulting homopolymers are crystalline and have high chemical resistance to organic solvents. The highest Melting point was registered for cPentOx (306 °C), followed by cHexOx (251 °C) and cBuOx (243 °C). The crystal structure of the homopolymers was put into evidence by X-ray diffraction and appeared to be similar to that of the poly(2-isopropyl-2-oxazoline). The absence of any hydrogen bonding or π–π interactions, makes these compounds a special class of high performance polymers which possess high Tm solely based on Debye and Keesom van der Waals interactions of the side-chains. The copolymerization of cPentOx with 2-ethyl-2-oxazoline (EtOx) and cBuOx, respectively are also reported indicating the formation of near ideal random copolymers. Furthermore, the copolymers of cPentOx with cBuOx with compositions in the range from 0 to 100% revealed a linear dependence of Melting Temperature with the weight fraction of comonomer. For cPentOx-EtOx copolymers containing up to 25 wt% EtOx a linear decrease of the Melting Temperature with composition was registered, most likely due to the disturbance of the cPentOx crystalline domains. Further, increasing the EtOx wt% revealed a complex non-linear dependence of glass transition Temperature on composition, whereby the glass transition Temperature of some copolymers was lower than for pure PEtOx.
Bart Verbraeken - One of the best experts on this subject based on the ideXlab platform.
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poly 2 cycloalkyl 2 oxazoline s high Melting Temperature polymers solely based on debye and keesom van der waals interactions
2016Co-Authors: Valentin Victor Jerca, Kathleen Lava, Bart Verbraeken, Richard HoogenboomAbstract:The synthesis of new 2-cycloalkyl-2-oxazoline monomers, namely 2-cyclobutyl (cBuOx), 2-cyclopentyl (cPentOx) and 2-cyclohexyl-2-oxazoline (cHexOx) is described. Their microwave-assisted cationic ring-opening polymerisation allowed the synthesis of well-defined homopolymers. The resulting homopolymers are crystalline and have high chemical resistance to organic solvents. The highest Melting point was registered for cPentOx (306 °C), followed by cHexOx (251 °C) and cBuOx (243 °C). The crystal structure of the homopolymers was put into evidence by X-ray diffraction and appeared to be similar to that of the poly(2-isopropyl-2-oxazoline). The absence of any hydrogen bonding or π–π interactions, makes these compounds a special class of high performance polymers which possess high Tm solely based on Debye and Keesom van der Waals interactions of the side-chains. The copolymerization of cPentOx with 2-ethyl-2-oxazoline (EtOx) and cBuOx, respectively are also reported indicating the formation of near ideal random copolymers. Furthermore, the copolymers of cPentOx with cBuOx with compositions in the range from 0 to 100% revealed a linear dependence of Melting Temperature with the weight fraction of comonomer. For cPentOx-EtOx copolymers containing up to 25 wt% EtOx a linear decrease of the Melting Temperature with composition was registered, most likely due to the disturbance of the cPentOx crystalline domains. Further, increasing the EtOx wt% revealed a complex non-linear dependence of glass transition Temperature on composition, whereby the glass transition Temperature of some copolymers was lower than for pure PEtOx.
