The Comparative Determination of the Molecular Weight of Rubber by the Methods of Light-Scattering and Osmometry

1956 ◽  
Vol 29 (2) ◽  
pp. 477-484
Author(s):  
B. Dogadkin ◽  
I. Soboleva ◽  
M. Arkhangelskaya
Keyword(s):  
Molecular Weight ◽  
Light Scattering ◽  
Natural Rubber ◽  
High Molecular Weight ◽  
Scattering Method ◽  
Comparative Determination

Abstract 1. An account is given of experiments to determine the molecular weight of natural rubber and other high molecular-weight compounds by light-scattering and osmometry. 2. A new design of osmometer for determining molecular weight is described. 3. It is shown that the light-scattering method gives molecular weight values which agree satisfactorily with those given by the osmotic method.

Determination of Peroxides in Synthetic Rubbers

1945 ◽  
Vol 18 (4) ◽  
pp. 874-876
Author(s):  
Richard F. Robey ◽  
Herbert K. Wiese
Keyword(s):  
Molecular Weight ◽  
Natural Rubber ◽  
Quantitative Determination ◽  
High Molecular Weight ◽  
Active Oxygen ◽  
Lower Molecular Weight ◽  
Synthetic Rubber ◽  
High Molecular Weight Polymers ◽  
Methanol Solutions

Abstract Peroxides are found in synthetic rubbers either as the result of attack by oxygen, usually from the air, or as a residue from polymerization operations employing peroxide catalysts. Because of possible detrimental effects of active oxygen on the properties of the rubber, a method of quantitative determination is needed. The concentration of peroxides in substances of lower molecular weight may be determined with ferrous thiocyanate reagent, either titrimetrically as recommended by Yule and Wilson or colorimetrically as by Young, Vogt, and Nieuwland. Unfortunately, many highly polymeric substances are not soluble in the acetone and methanol solutions employed in these procedures. This is also the case with hydrocarbon monomers, such as butadiene, containing appreciable concentrations of soluble high molecular weight polymers. Bolland, Sundralingam, Sutton and Tristram recommended benzene as a solvent for natural rubber samples and the reagent made up in methanol. However, most synthetic rubbers are not readily soluble even in this combination. The following procedure employs the ferrous thiocyanate reagent in combination with a solvent capable of maintaining considerable concentrations of synthetic rubber in solution. The solvent comprises essentially 20 per cent ethanol in chloroform.

Determination of the molecular weight of polysaccharides by the light-scattering method

1969 ◽  
Vol 18 (12) ◽  
pp. 2642-2643
Author(s):  
A. K. Dzizenko ◽  
V. D. Sorochan ◽  
T. I. Prudnikova ◽  
Yu. S. Ovodov
Keyword(s):  
Molecular Weight ◽  
Light Scattering ◽  
Scattering Method

Determination of the Molecular Weight of Rubber and Polystyrene by the Methods of Light Scattering and Osmometry

1950 ◽  
Vol 23 (1) ◽  
pp. 89-97
Author(s):  
B. Dogadkin ◽  
I. Soboleva ◽  
M. Arkhangel'skaya
Keyword(s):  
Molecular Weight ◽  
Light Scattering ◽  
Natural Rubber ◽  
Satisfactory Agreement ◽  
Molecular Weights ◽  
Molecular Compounds

Abstract 1. Experiments on the determination of the molecular weights of natural rubber and other high-molecular compounds by the methods of light scattering and osmometry are reported. 2. An osmometer of new design, suitable for determining molecular weights, is described. 3. It is shown that the method of light scattering yields values for molecular weights which are in satisfactory agreement with those obtained by the method of osmometry.

Determination of the molecular weight of polyformaldehyde by the light scattering method

1963 ◽  
Vol 4 (2) ◽  
pp. 367-375 ◽  
Author(s):  
I.M. Bel'govskii ◽  
N.S. Enikolopyan ◽  
L.S. Sakhonenko
Keyword(s):  
Molecular Weight ◽  
Light Scattering ◽  
Scattering Method
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