ChemInform Abstract: POLYMERIZATION OF CONJUGATED DIENES AT HIGH PRESSURES. XI. PRESSURE EFFECT IN N THE ANIONIC POLYMERIZATION OF 2,3-DIMETHYL-1,3-BUTADIENE. I. KINETIC INVESTIGATION

1976 ◽  
Vol 7 (32) ◽  
Author(s):  
ALI REZA KHALILPOUR ◽  
GERARD JENNER ◽  
ANTONIN DELUZARCHE
Keyword(s):  
Anionic Polymerization ◽  
High Pressures ◽  
Pressure Effect ◽  
Conjugated Dienes ◽  
Kinetic Investigation

Dimerization of Carboxylic Acids in Solution up to High Pressures and Temperatures. 1. Pivalic Acid

1987 ◽  
Vol 42 (2) ◽  
pp. 187-196
Author(s):  
E. M. Borschel ◽  
M. Buback
Keyword(s):  
Hydrogen Bond ◽  
High Pressure ◽  
Ir Spectroscopy ◽  
Quantitative Measurement ◽  
High Pressures ◽  
Pressure Effect ◽  
Pivalic Acid ◽  
Dilute Solution ◽  
Hydrogen Bond Strength ◽  
High Pressures And Temperatures

Pivalic acid in dilute solution of n-heptane and of CCl4 is studied via IR spectroscopy in the region of the C = O and O - H stretching fundamentals up to pressures of 2 kbar and temperatures of 175 °C. Lambert-Beer's law is shown to be valid for the C = O modes of the acid monomer and of the hydrogen-bonded cyclic dimer, which enables the quantitative measurement of the dimerization equilibrium as a function of pressure and temperature. Increasing pressure favours the dimerization in n-heptane to a larger extent than in CCl4 solution. In both solvents this pressure effect increases with temperature. The hydrogen bond strength within the dimer species is slightly reduced toward high pressure. The data on the temperature dependence of the dimerization volume and on the pressure dependence of the dimerization enthalpy are compared with direct information on both species as derived from their O - H fundamental modes.

Kinetic investigation of the anionic polymerization of MMA using sparteine as σ-ligand

Polymer ◽  
2002 ◽  
Vol 43 (25) ◽  
pp. 7195-7205 ◽  
Author(s):  
François Lavaud ◽  
Michel Fontanille ◽  
Yves Gnanou
Keyword(s):  
Anionic Polymerization ◽  
Kinetic Investigation

scholarly journals Metrological Evaluation of Deep-Ocean Thermometers

2021 ◽  
Vol 9 (4) ◽  
pp. 398
Author(s):  
Andrea Peruzzi ◽  
Rien Bosma ◽  
Jan van Geel ◽  
Sven Ober
Keyword(s):  
High Pressures ◽  
Pressure Effect ◽  
Deep Ocean ◽  
Metrological Investigation ◽  
Triple Point Of Water ◽  
Pressure Calibration ◽  
Compact Pressure ◽  
Small Device ◽  
Melting Point Of Gallium ◽  
Metrological Evaluation

An accurate metrological investigation was performed on several units of the two de facto standards for deep-ocean temperature measurements—the SBE35 (the reference thermometer) and the SBE3 (the working thermometer) from SeaBird Scientific. Four SBE35 units were repeatedly calibrated against state-of-the-art fixed-point cells (triple point of water at 0.01 °C and melting point of gallium at 29.7646 °C), with calibration uncertainties of approximately 0.2 mK and 0.5 mK, respectively. Three SBE35 units and one SBE3 unit were calibrated in the temperature range 0 °C to 30 °C, again with sub-millikelvin calibration uncertainties, in a recently-developed water–bath calibration facility. All these calibrations evidenced (1) the deviation of each unit from its original manufacturer’s calibration (up to 1.7 mK), which were found to be inconsistent with the manufacturer’s uncertainty claims and (2) unexplained irreproducibilities, which could not be attributed to the calibration system of up to 1.5 mK. The effect of high pressures (up to 60 MPa) on the response of two SBE35 units was investigated by pressurizing the SBE35 units inside a purpose-built compact pressure enclosure. The results of the pressure investigation confirmed the existence of a small device-dependent pressure effect (approximately 0.3 mK at 60 MPa) and the need for individual temperature–pressure calibration of each SBE35 unit.

Anionic Polymerization and Block Copolymerization ofN,N-Diethylacrylamide in the Presence of Triethylaluminum. Kinetic Investigation Using In-Line FT-NIR Spectroscopy

2006 ◽  
Vol 39 (8) ◽  
pp. 2773-2787 ◽  
Author(s):  
Xavier André ◽  
Khaled Benmohamed ◽  
Alexander V. Yakimansky ◽  
Galina I. Litvinenko ◽  
Axel H. E. Müller
Keyword(s):  
Anionic Polymerization ◽  
Nir Spectroscopy ◽  
Kinetic Investigation ◽  
Block Copolymerization

First-principle study on ScAl3C3-type LaCd3P3 phases under high pressure

2020 ◽  
Vol 34 (29) ◽  
pp. 2050347
Author(s):  
Yufen Ren ◽  
Shiquan Feng ◽  
Chaosheng Yuan ◽  
Xuerui Cheng ◽  
Zuo Li
Keyword(s):  
High Pressure ◽  
Optical Properties ◽  
Thermal Properties ◽  
First Principles ◽  
High Pressures ◽  
Mechanical Stability ◽  
Pressure Effect ◽  
First Principle ◽  
First Principles Calculations ◽  
Debye Temperatures

Using first-principles calculations, we investigate the structural, electronic, thermal and optical properties of hexagonal ScAl3C3-type structure LaCd3P3 under high pressure. By calculating elastic constant, the mechanical stability of LaCd3P3 at high pressures was discussed. Then, by calculating the band gap and density of states, the pressure effect on electronic properties of LaCd3P3 was discussed. By calculating longitudinal, transverse sound, mean sound velocities, and the Debye temperatures at different pressures, the effect of pressure on thermal properties of LaCd3P3 was investigated. What is more, the dielectric function [Formula: see text] and reflectivity [Formula: see text] were calculated to explore the change of optical properties of LaCd3P3 under high pressure.

A first-principles Hartree-Fock description of MnO at high pressures

1998 ◽  
Vol 77 (4) ◽  
pp. 1063-1075
Author(s):  
W. C. Mackrodt, E.-A. Williamson, D. W
Keyword(s):  
First Principles ◽  
High Pressures ◽  
Hartree Fock
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