The Ozonization of Unsaturated Compounds. III. The Addition of Ozone to Internal and External Double Bonds in Butadiene Rubber

1959 ◽  
Vol 32 (1) ◽  
pp. 284-287 ◽  
Author(s):  
A. I. Yakubchik ◽  
N. G. Kasatkina ◽  
T. E. Pavlovskaya
Keyword(s):  
Quantitative Determination ◽  
Butadiene Rubber ◽  
Double Bonds ◽  
Ozone Absorption ◽  
Unsaturated Compounds

Abstract 1. It was established that the curves of ozone absorption by butadiene rubbers do not show breaks. 2. Sodium butadiene rubber was ozonized 25, 50, 75 and 100%. From the quantitative determination of the external double bonds which add ozone it was established that there is no strict selectivity in the ozonization of the double bonds of rubber: the external double bonds are ozonized more rapidly than the internal and their ozonization is completed earlier than the ozonization of the internal double bonds.

A New Method for the Direct Determination of Rubber. A Preliminary Communication

1938 ◽  
Vol 11 (2) ◽  
pp. 438-438
Author(s):  
E. Kheraskova ◽  
E. Korsunskaya
Keyword(s):  
Acetic Acid ◽  
Natural Rubber ◽  
Direct Determination ◽  
Methyl Groups ◽  
Butadiene Rubber ◽  
Double Bonds ◽  
Synthetic Rubber ◽  
Oxidation Of Organic Compounds ◽  
Preliminary Communication

Abstract The conventional methods for the direct determination of rubber cannot be used for determining natural rubber in the presence of sodium-butadiene rubber. These methods are based either on precipitation of the rubber from solution or on the determination, by one method or another, of the double bonds in the rubber molecule. Since natural rubber and synthetic rubber differ in their solubilities but little, the method of precipitation obviously cannot be used for their separation. Nor are methods which involve determining the double bonds adequate to distinguish them, because both kinds of rubber are unsaturated compounds. It was therefore of interest to develop a method of analysis based on the determination of the methyl groups, which are present only in the natural rubber molecule. Kuhn and L'Orsa (Z. angew. Chem., 44, 847 (1931)) have shown that, in the oxidation of organic compounds, a methyl group connected with a carbon atom is partially oxidized to acetic acid. The object was to develop this reaction into a method of rubber analysis by establishing the optimum conditions for the quantitative oxidation to acetic acid of all the methyl groups in the rubber hydrocarbon.

Quantitative determination of longitudinal and transverse cross-relaxation rates

1999 ◽  
Vol 96 (9/10) ◽  
pp. 1608-1615
Author(s):  
T. E. Malliavin ◽  
H. Desvaux ◽  
M. A. Delsuc
Keyword(s):  
Quantitative Determination ◽  
Cross Relaxation ◽  
Relaxation Rates

Quantitative Determination of Gallic acid and Cyanidin-3-O-Glucoside within Sumac Extracts by HPLC-MS/MS

Planta Medica ◽  
2011 ◽  
Vol 77 (12) ◽  
Author(s):  
M Koşar ◽  
F Göger ◽  
N Kırımer ◽  
KHC Başer
Keyword(s):  
Quantitative Determination ◽  
Gallic Acid

Quantitative determination of compound leads in Schiniopsis brasiliensis Engler

Planta Medica ◽  
2014 ◽  
Vol 80 (16) ◽  
Author(s):  
FHA Fernandes ◽  
RSA Batista ◽  
G Véras ◽  
FS Souza ◽  
ACD Medeiros
Keyword(s):  
Quantitative Determination
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