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Example text
The polymer is then dried, extracted with ethanol-toluene azeotrope, and then pressed into a thin sheet. The bound styrene value is obtained by refractive index measurements. 2 Bound Acrylonitrile Content The ISO 3900 method for bound acrylonitrile can be applied to nitrile rubber (NBR) latices, carboxylated versions of NBR, and nitrile-isoprene (NIR) latices. The preparative stage of this method involves the extraction of an air dried film of the nitrile latex with water, to remove water soluble nitrogen containing material and drying to constant mass.
DOP) into a compound will improve its processability, in addition to changing a wide range of physical properties. 2. 2 Factice There are two main categories of flame retardant: organic and inorganic. This is sulfur crosslinked vegetable oil and so a relatively high sulfur content will give a good indication as to its presence. 3 Resins High styrene resins are thermoplastic polymers of styrene and butadiene and are used to modify the hardness of rubber compounds. They are used in preference to high levels of carbon black as they do not increase the processing viscosity to such a degree.
The ISO 3136 method for bound styrene is only applicable to straight SBR latices and not to modified versions such as carboxylated SBR latex. The ISO method 4655 applies to all SBR type latices. In the case of ISO 3136, solid polymer is first prepared by coagulating the latex with sodium chloride and sulfuric acid in the presence of methanol. The polymer is then dried, extracted with ethanol-toluene azeotrope, and then pressed into a thin sheet. The bound styrene value is obtained by refractive index measurements.