Effect of Solvent Type on High-Temperature Thermal Gradient Interaction Chromatography of Polyethylene and Ethylene-1-Octene Copolymers

2014 ◽  
Vol 216 (1) ◽  
pp. 38-48 ◽  
Author(s):  
Abdulaziz Alghyamah ◽  
João B. P. Soares
Keyword(s):  
High Temperature ◽  
Thermal Gradient ◽  
Effect Of Solvent ◽  
Solvent Type

scholarly journals Metal(II) Coordination Polymers from Tetracarboxylate Linkers: Synthesis, Structures, and Catalytic Cyanosilylation of Benzaldehydes

Catalysts ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 204
Author(s):  
Yu Li ◽  
Chumin Liang ◽  
Xunzhong Zou ◽  
Jinzhong Gu ◽  
Marina V. Kirillova ◽  
...  
Keyword(s):  
Coordination Polymers ◽  
Polycarboxylic Acid ◽  
X Ray Diffraction ◽  
X Ray ◽  
Trimethylsilyl Cyanide ◽  
Effect Of Solvent ◽  
Highly Active ◽  
Solvent Type ◽  
Metal Organic ◽  
Chloride Salts

Three 2D coordination polymers, [Cu2(µ4-dpa)(bipy)2(H2O)]n∙6nH2O (1), [Mn2(µ6-dpa)(bipy)2]n (2), and [Zn2(µ4-dpa)(bipy)2(H2O)2]n·2nH2O (3), were prepared by a hydrothermal method using metal(II) chloride salts, 3-(2′,4′-dicarboxylphenoxy)phthalic acid (H4dpa) as a linker, as well as 2,2′-bipyridine (bipy) as a crystallization mediator. Compounds 1–3 were obtained as crystalline solids and fully characterized. The structures of 1–3 were established by single-crystal X-ray diffraction, revealing 2D metal-organic networks of sql, 3,6L66, and hcb topological types. Thermal stability and catalytic behavior of 1–3 were also studied. In particular, zinc(II) coordination polymer 3 functions as a highly active and recoverable heterogeneous catalyst in the mild cyanosilylation of benzaldehydes with trimethylsilyl cyanide to give cyanohydrin derivatives. The influence of various parameters was investigated, including a time of reaction, a loading of catalyst and its recycling, an effect of solvent type, and a substrate scope. As a result, up to 93% product yields were attained in a catalyst recoverable and reusable system when exploring 4-nitrobenzaldehyde as a model substrate. This study contributes to widening the types of multifunctional polycarboxylic acid linkers for the design of novel coordination polymers with notable applications in heterogeneous catalysis.

High temperature studies of Urania in a thermal gradient

1969 ◽  
Vol 30 (1-2) ◽  
pp. 50-56 ◽  
Author(s):  
B.E. Fryxell ◽  
E.A. Aitken
Keyword(s):  
High Temperature ◽  
Thermal Gradient

Unsaturation Characterization of Polyolefins by NMR and Thermal Gradient NMR (TGNMR) with a High Temperature Cryoprobe

2012 ◽  
Vol 312 (1) ◽  
pp. 88-96 ◽  
Author(s):  
Zhe Zhou ◽  
Rongjuan Cong ◽  
Yiyong He ◽  
Manjiri Paradkar ◽  
Mehmet Demirors ◽  
...  
Keyword(s):  
High Temperature ◽  
Thermal Gradient

System Maps for XTerra MS C18: Effect of Solvent Type on Selectivity in Reversed-Phase Liquid Chromatography

2005 ◽  
Vol 61 (11-12) ◽  
pp. 587-593 ◽  
Author(s):  
W. Kiridena ◽  
C. DeKay ◽  
N. D. Villiere ◽  
W. W. Koziol ◽  
C. F. Poole
Keyword(s):  
Liquid Chromatography ◽  
Reversed Phase ◽  
Reversed Phase Liquid Chromatography ◽  
Effect Of Solvent ◽  
Solvent Type ◽  
System Maps ◽  
Phase Liquid

Metamorphism of the MacLean Lake and Central Metavolcanic belts, La Ronge domain, Trans-Hudson Orogen: pressure-temperature variations and tectonic implications

1998 ◽  
Vol 35 (8) ◽  
pp. 905-922 ◽  
Author(s):  
Haiming Yang ◽  
Kurt Kyser ◽  
Kevin Ansdell
Keyword(s):  
High Temperature ◽  
Thermal Gradient ◽  
Amphibolite Facies ◽  
Tectonic Zone ◽  
Thrust Sheet ◽  
Temperature Variations ◽  
High Thermal Gradient ◽  
Tectonic Implications ◽  
Peak Metamorphism ◽  
Peak Pressures

Metamorphic assemblages differ between the metasedimentary MacLean Lake belt and the adjacent Central Metavolcanic belt in the La Ronge domain, Trans-Hudson Orogen. The former consists of meta-arkoses, psammitic gneisses, metaconglomerates, and calc-silicate gneisses of upper amphibolite facies (600-740°C, 440-660 MPa) with local migmatization, whereas the latter is comprised mainly of metavolcanic and plutonic rocks, with minor metasedimentary schists of greenschist to lower amphibolite facies (480-630°C, 520-560 MPa). Petrographic evidence indicates that peak metamorphic conditions were reached towards the end of D1 deformation during which the Central Metavolcanic belt was thrust onto the MacLean Lake belt along the McLennan Lake tectonic zone, which separates the two belts. Peak metamorphic assemblages did not undergo retrograde alteration during D2 deformation, indicating that high temperature was maintained during D2 deformation. Differences in pressure (P) and temperature (T) between the northeastern and southwestern parts of the Central Metavolcanic belt may have resulted from tilting along strike after peak metamorphism. Peak temperatures increase gradually from the Central Metavolcanic belt to MacLean Lake belt across the McLennan Lake tectonic zone. Peak pressures in the two belts are similar, implying that the Central Metavolcanic belt thrust sheet was probably thin. The P-T data for the MacLean Lake belt indicate a relatively high thermal gradient (40-50°C/km), similar to that in the metasedimentary Kisseynew domain in the orogen.

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