Chemorheological Treatment of Crosslinked EPDM

1971 ◽  
Vol 44 (5) ◽  
pp. 1334-1340 ◽  
Author(s):  
Kenkichi Murakami ◽  
Saburo Tamura
Keyword(s):  
Stress Relaxation ◽  
Main Chain ◽  
Relaxation Curve ◽  
Oxidative Cleavage ◽  
The Other ◽  
Carbon Bond ◽  
Carbon Carbon Bond ◽  
Straight Line ◽  
Interchange Reaction ◽  
Straight Lines

Abstract Stress relaxation mechanisms were investigated on three types of (EPDM) ethylene-propylene terpolymers in air at 109° C. These polymers differ only by the structure of the crosslinkage in which there is a carbon-carbon bond, a polysulfide linkage −Sx⁁− or a monosulfide linkage (—S—). All the stress relaxation of peroxide-cured EPDM polymer was not due to the oxygen-induced cleavage of the main chain but to a physical flow. In the case of sulfur-cured EPDM polymer, the relaxation curve is divided into three straight lines when the procedure X is used and log f(t)/f(0( is plotted linearly with time. It was concluded that this graph was in agreement with an interchange reaction of the polysulfide linkage by an oxidative cleavage of the monosulfide linkage. On the other hand, a TT-cured EPDM polymer gave a plot with a straight line. This stress relaxation could be explained by an oxidative cleavage of the monosulfide linkage.

Is the 2,3-carbon–carbon bond of indole really inert to oxidative cleavage by Oxone? – Synthesis of isatoic anhydrides from indoles

2013 ◽  
Vol 11 (43) ◽  
pp. 7455 ◽  
Author(s):  
Amber C. Nelson ◽  
Emily S. Kalinowski ◽  
Nikolas J. Czerniecki ◽  
Taylor L. Jacobson ◽  
Peter Grundt
Keyword(s):  
Oxidative Cleavage ◽  
Carbon Bond ◽  
Carbon Carbon Bond

Appendix, containing the Investigation of a Formula for the Rectification of any Arch of an Ellipse

1805 ◽  
Vol 5 (2) ◽  
pp. 271-293
Keyword(s):  
Finite Number ◽  
The Other ◽  
Algebraic Equations ◽  
Conic Sections ◽  
Straight Line ◽  
Curve Line ◽  
Straight Lines

It is now generally understood, that by the rectification of a curve line, is meant, not only the method of finding a straight line exactly equal to it, but also the method of expressing it by certain functions of the other lines, whether straight lines or circles, by which the nature of the curve is defined. It is evidently in the latter sense that we must understand the term rectification, when applied to the arches of conic sections, seeing that it has hitherto been found impossible, either to exhibit straight lines equal to them, or to express their relation to their co-ordinates, by algebraic equations, consisting of a finite number of terms.

scholarly journals Identical appended series of points as invariants in the collocal general-colinear fields

2003 ◽  
Vol 2 (5) ◽  
pp. 387-394
Author(s):  
Sonja Krasic
Keyword(s):  
The Other ◽  
Straight Line ◽  
Similar Series ◽  
Vanishing Line ◽  
Identical Series ◽  
Straight Lines ◽  
General Method

In order to bring the collocal collinear fields from the general into the perspective position, it is required to determine the identical appended series of points. Because of the properties depending on the projectivity that is given by the four appended points (straight lines) the appended identical series of the points and types are ranked among the invariants of general-collinear and perspectively-collinear fields. The procedure of determination of appended identical series of points is comprised of the following: in the set of ?1 of perspectively similar series in one field (whose center of perspective is a point on the vanishing line), find those that are identical to all the series in the set ?1 of perspective identical series of points in the other field (whose center of perspective is the point on the infinitely distant straight line). In the procedure, one begins from the appended similar methods obtained by the general method. The procedure is simplified by the introduction of the specially given similar series of points.

ChemInform Abstract: Is the 2,3-Carbon-Carbon Bond of Indole Really Inert to Oxidative Cleavage by Oxone? - Synthesis of Isatoic Anhydrides from Indoles.

ChemInform ◽  
2014 ◽  
Vol 45 (10) ◽  
pp. no-no
Author(s):  
Amber C. Nelson ◽  
Emily S. Kalinowski ◽  
Nikolas J. Czerniecki ◽  
Taylor L. Jacobson ◽  
Peter Grundt
Keyword(s):  
Oxidative Cleavage ◽  
Carbon Bond ◽  
Carbon Carbon Bond
Sign in / Sign up

Export Citation Format

Share Document