Interpenetrating polymer networks: High molecular weight natural rubber and poly(2,6-dimethyl-1,4 phenylene oxide)

1992 ◽  
Vol 44 (2) ◽  
pp. 255-261 ◽  
Author(s):  
G. G. De Barros ◽  
M. W. Huang ◽  
H. L. Frisch
Keyword(s):  
Molecular Weight ◽  
Natural Rubber ◽  
High Molecular Weight ◽  
Polymer Networks ◽  
Interpenetrating Polymer Networks ◽  
Phenylene Oxide

Relation between Molecular Weights and Physical Properties of Rubber Fractions

1941 ◽  
Vol 14 (3) ◽  
pp. 580-589 ◽  
Author(s):  
G. Gee ◽  
L. R. G. Treloar
Keyword(s):  
Molecular Weight ◽  
Natural Rubber ◽  
Physical Properties ◽  
High Molecular Weight ◽  
Elastic Properties ◽  
Elastic Material ◽  
Experimental Results ◽  
Molecular Weights ◽  
High Elasticity ◽  
Latex Rubber

Abstract As high elasticity is a property possessed only by substances of high molecular weight, it is of interest to enquire into the relation between the elastic properties of a highly elastic material such as rubber and its molecular weight. An investigation on these lines has been made possible through the work of Bloomfield and Farmer, who have succeeded in separating natural rubber into fractions having different average molecular weights. The more important physical properties of these fractions have been examined with the object of determining which of the properties are dependent on molecular weight and which are not. Fairly extensive observations were made on the fractions from latex rubber referred to as Nos. 2, 3 and 4 by Bloomfield and Farmer, and some less extensive observations were carried out on the less oxygenated portion of fraction No. 1 obtained from crepe rubber (called hereafter 1b) . Before considering these experimental results, and their relation to the molecular weights of the fractions, it will be necessary to refer briefly to the methods used for the molecular-weight determinations, and to discuss the significance of the figures obtained.

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.

Poly(2,6-dimethyl-1,4-phenylene oxide)-Polystyrene Interpenetrating Polymer Networks

1980 ◽  
Vol 13 (4) ◽  
pp. 1016-1018 ◽  
Author(s):  
H Frisch ◽  
D Klempner ◽  
H Yoon ◽  
K Frisch
Keyword(s):  
Polymer Networks ◽  
Interpenetrating Polymer Networks ◽  
Phenylene Oxide

Interpenetrating Polymer Networks and Related Topological Isomers

1989 ◽  
Vol 171 ◽  
Author(s):  
Harry L. Frisch
Keyword(s):  
Microphase Separation ◽  
Linear Chain ◽  
Polymer Networks ◽  
Interpenetrating Polymer Networks ◽  
Solubility Parameters ◽  
Phenylene Oxide ◽  
Phase Compatibility

ABSTRACTWe have studied the phase compatibility of simultaneous interpenetrating polymer networks poly (2,6–dimethyl–l,4–phenylene oxide) with a number of other polymer networks as a function of their solubility parameters. Even when the blends of the corresponding linear chain polymers are immiscible their interpenetrating polymer networks can be miscible in all proportions. We have also prepared the corresponding pseudo (or semi) interpenetrating polymer networks where one component is linear and in one system the polymeric catenanes. All these systems generally show microphase separation.

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