Ethylene physical constants

Table 1. Some Physical Constants of Ethylene Oxide, C2H4O...

Values for the physical constants of ethylene glycol dinitrate found by de Kreuk [14], and Boileau and Thomas [15] are given in Tables 2 and 3 respectively (p. 3). Dipole moments are given in Table 4 (p. 4). 

Table I. Physical Constants of Diethylene Glycol—Ethylene Glycol Mixtures0...

V / 10 PHYSICAL CONSTANTS OF POLY(ETHYLENE) Dimensions of Linear Poiyethylene NkAeoiAes ... 

D. PHYSICAL CONSTANTS OF MODIFIED POLY(ETHYLENE-CO-TETRAFLUOROETHYLENE) -[CH2-CH2-CF2-CF2]-... 

Physical Constants of Modified Poly(ethylene-co-tetrafluoroethylene) V/47... 

Physical Constants of Poly(oxyethylene-oxyterephthaloyl) (Poly(ethylene terephthalate))... 

V/116 PHYSICAL CONSTANTS OF POLY(OXYETHYLENE-OXYTEREPHTHALOYL) (POLY(ETHYLENE TEREPHTHALATE))... 

The only physical property which has been studied for substituted vinylidene sets is the nmr chemical shift of the vinylidene proton in substituted ethylenes and in tra s-l,2-disubstituted ethylenes. The first attempt at correlating chemical shift data for substituted ethylenes with the Hammett equation appears to be the work of Banwell and Sheppard (53), who reported a correlation of A2 values with the or constants, the A2 values being defined by the equation... 

Ethylene oxide aqueous solutions, physical properties of, 20 635t Ethylene oxide catalysts, 20 648-649 Ethylene oxide hydrolysis, rate constants for, 20 638t... 

CASRN 75-21-8 molecular formula C2H4O FW 44.05 Chemical/Physical The second-order hydrolysis rate constant of ethylene oxide in 7.08 mM perchloric acid and 36.3 °C is 0.027/M-sec (Kirkovsky et al, 1998). 

Ivanchev et al. compared, under the same ethylene polymerization conditions, the performances of some supported systems with those of traditional ones. The authors not only found that the activity of supported systems is determined by the chemical-physical characteristics of the carrier, which influence the number and the propagation constant of the active centres, but also, in agreement with other authors that changes take place, in the elementary polymerization processes, such as to modify the polymer molecular structure. Indeed, as one can observe (Table 6), it is... 

Fig. 5. Dielectric constant (D) of some hydroorganic solvents as a (unction of temperature. DMSO, dimethyl sulfoxide EGOH, ethylene glycol MeOH, methanol PrOH, propylene glycol MPD, 2-methyl-2,4-pentanediol. From Travers and Douzou (1970, 1974). Reprinted with permission of Journal of Physical Chemistry and Bio-chimie. Copyright by the American Chemical Society and Societe de Chimie Bio-logique.

Lower activation temperatures are usually preferred in commercial operations, despite the lower activity. The corresponding redistribution of sites results in improved polymer physical properties. An example is shown in Table 12, which is a list of the ESCR values, the resistance to chemical attack, of several ethylene-butene and ethylene-hexene copolymers. These copolymers were made at constant MI and density with Cr/ silica catalysts activated at various temperatures. The measured ESCR value decreases as the activation temperature is raised. This change results in part because the MW distribution is narrowed, but more so because the longest chains contain less branching.13... 

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