ChemInform Abstract: SYNTHESIS, STRUCTURE AND PROPERTIES OF THE ISOMERIC DINUCLEAR COMPLEXES ((DENC)2CUX2)2 (DENC = N,N-DIETHYLNICOTINAMIDE; X = CL OR BR) AND THE KINETICS OF THEIR REACTIONS WITH DENC IN METHYLENE CHLORIDE

1985 ◽  
Vol 16 (28) ◽  
Author(s):  
G. DAVIES ◽  
A. EL-TOUKHY ◽  
K. D. ONAN ◽  
M. VEIDIS
Keyword(s):  
Methylene Chloride ◽  
Dinuclear Complexes ◽  
Structure And Properties ◽  
Kinetics Of

Synthesis, Crystal Structure and Properties of Two Macrocyclic Dinuclear Complexes

2005 ◽  
Vol 30 (8) ◽  
pp. 1020-1026 ◽  
Author(s):  
Bo Liu ◽  
Hong Zhou ◽  
Zhiquan Pan ◽  
Hanping Zhang ◽  
Jingdong Hu ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Dinuclear Complexes ◽  
Structure And Properties

scholarly journals Modeling of structuring processes at hardening of expanding cements and concretes on their basis

2018 ◽  
Vol 196 ◽  
pp. 04035 ◽  
Author(s):  
Igor Kharchenko ◽  
Alexander Panchenko ◽  
Alexey Kharchenko ◽  
Vyacheslav Alekseev
Keyword(s):  
Theoretical Analysis ◽  
Rheological Model ◽  
Experimental Studies ◽  
High Strength ◽  
Cementitious Materials ◽  
Cement Stone ◽  
Formation Processes ◽  
Structure And Properties ◽  
Potential Index ◽  
Kinetics Of

This paper reports the results of experimental research of the effect of strain-restriction conditions on the structure and properties of sulfoaluminate expanding cementitious materials. Theoretical analysis of the development of pattern formation processes is performed by applying the developed rheological model, illustrating features of the kinetics of structure-forming processes according to the ratio of the potential index of extension with linear, flat and volumetric limitation of deformations of the extension. The results show that rheological model adequately correlates with the results of experimental studies and can be described mathematically. Found that with the volume limitation of deformations arising when mixing crystallographic phases with high density and strength, the pore structure of the cement stone contains mainly gel pores. This is the main prerequisite for obtaining a dense, high-strength and durable structure of cement stone and concrete on its basis.

Effect of a filler on the kinetics of acceptor-catalytic polyesterification, structure and properties of polymers and their composites

1989 ◽  
Vol 31 (1) ◽  
pp. 94-99
Author(s):  
V.V. Korshak ◽  
V.A. Vasnev ◽  
I.A. Gribova ◽  
A.I. Kuznetsov ◽  
S.V. Vinogradova ◽  
...  
Keyword(s):  
Structure And Properties ◽  
Kinetics Of

The non-stationary polymerization of styrene by HCIO 4 in CH 2 CI 2

1976 ◽  
Vol 351 (1667) ◽  
pp. 551-568 ◽  
Keyword(s):  
Rate Constants ◽  
Methylene Chloride ◽  
Dissociation Constants ◽  
Propagation Rate ◽  
Polymer Chains ◽  
Stage I ◽  
Electrically Conducting ◽  
Steady Stage ◽  
Ionic Components ◽  
Kinetics Of

The non-stationary precursor reaction (stage I) in the polymerization of styrene by perchloric acid in methylene chloride has been examined, by stopped-flow methods over the range 0 to –80 °C. At all temperatures there is evidence of a transient, electrically conducting, intermediate species, absorbing at 340 nm, which reaches its peak concentration at times ranging from 0.1s at 0° C to 0.5–3s at –80 °C (variable with reagent concentra­tions). At the low monomer concentrations (< 0.2M) accessible to the technique, stage I can be quantitatively discriminated from the subsequent steady stage II only below ca . –60 °C. At these low temperatures, contrary to expectations, the conversion during stage I proves to be by a dual mech­anism, the ionic reaction producing no more than about half the mass of polymer and a much smaller fraction of the number of polymer chains. The overall time-scale of stage I appears to be determined primarily by that of removal of free HCIO 4 by the non-ionic mechanism, rather than by the kinetics of the ionic polymerisation. The overall conversions cannot therefore be analysed to yield ionic rate constants. In reactions in presence of the salt n -Bu 4 NCIO 4 , the instantaneous rates can be separated into their non-ionic and ionic components, and approxi­mate values derived for the paired-ion propagation rate constants. k ± p 2000 at –80 °C; 4000–5000 at –60 °C; (unit: dm 3 mol –1 s –1 ). A more speculative analysis of the rates in salt-free systems permits estimates of the free ion propagation constants some 10–20 times the above values, and of ion-pair dissociation constants in the region of 1–5 x 10 –7 mol dm –3 at –60 to –80 °C.

Effect of branched copolymers on the kinetics of polymerization of MMA and the structure and properties of the resulting polymers

2008 ◽  
Vol 50 (10) ◽  
pp. 1028-1037 ◽  
Author(s):  
S. V. Kurmaz ◽  
I. S. Kochneva ◽  
E. O. Perepelitsina ◽  
M. L. Bubnova ◽  
V. V. Ozhiganov
Keyword(s):  
Structure And Properties ◽  
Kinetics Of Polymerization ◽  
Branched Copolymers ◽  
Kinetics Of

Kinetics of Methylene Chloride Hydrolysis and the Salt Effect under Hydrothermal Conditions

2001 ◽  
Vol 40 (4) ◽  
pp. 1026-1031 ◽  
Author(s):  
Yoshito Oshima ◽  
Budianto Bijanto ◽  
Seiichiro Koda
Keyword(s):  
Methylene Chloride ◽  
Salt Effect ◽  
Hydrothermal Conditions ◽  
Kinetics Of
Sign in / Sign up

Export Citation Format

Share Document