Tensile green strength

ASTM D6746,2003. Determination of tensile green strength. 

Elongation, tensile strength, hardness, snappiness, good flowability, easy vulcanization, weatherability. ozone resistance, heat resistance, skid resistance, abrasion resistance Flowability, injection molding processability easy vulcanization, weatherability, ozone resistance, heat resistance, skid resistance, abrasion resistance, snappiness Green strength, flowability, extmdability injection molding processability, weatherability, ozone resistance, heat resistance snappiness... 

The free-radical catalysts were found to produce a product that did not have the tack, green strength, or gum tensile of natural rubber. Whereas natural rubber is an essentially pure cis-1,4 structure, the emulsion product was of mixed microstructure. This... 

With barium-containing anionic initiators [88] polybutadiene with a high trans content [89] and less then 5 % of vinyl double bonds can be synthesized. This rubber does not crystallize at room temperature but can undergo crystallization upon stretching. The properties of rubber, e. g., green strength, tackiness of the compound, as well as tensile strength of the vulcanizate, are much improved by strain-induced crystallization. 

Both free-radical and anionic polymerization produce PBs that have mixed microstructures. Neither of these routes produces a rubber that can replace the high tack, green strength, or gum tensile of natural rubber. However, these PBs have been useful in many applications. 

CaCO EPR rubber rubber silicone maleates fatty acid silanes PDMS decreased disperse component of the surface energy filler surface energy approaches surface energy of matrix decreased tensile strength and flexural cracking increased green strength, Mooney viscosity, and tensile properties surface hydrophobization resistance to solvent extraction and water 21 49 49 37... 

Green strength gum tensile strength (prior to vulcanization)... 

PROPERTIES OF SPECIAL INTEREST High green Strength, tack, can be compoimded with fillers and other polymers, can form block copolymers for specialty apphcations, high tensile strength owing to strain-induced crystallization. 

Properties. Typical raw polymer and vulcanized properties of synthetic IR are similar to those of NR. Both exhibit good inherent tack, high compounded gum tensile strength (green strength), and good vulcanizate hysteresis (low values) and tensile properties. In synthetic IR, there is minimal variance in physical properties lot to lot, and there is a low concentration of nonrubber constituents compared to natural rubber. 

Fig. 12. Tensile strengths of autohesion (tack T) and cohesion (green strength S) of natural rubber as a function of molecular weight M (103).

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