Elastomers vulcanizates

Finally, it is instructive to compare the temperature effect on the tensile strength of the SBS and SIS block polymers. As noted previously (Figure 6) the tensile strength of an elastomer vulcanizate can be related to the difference between the test temperature and the Tg of the elastomer, in accordance with the viscoelastic theory of tensile strength. Since the Tg values for polyisoprene ( — 65°C) and polybutadiene ( —95°C) differ... 

W. M. Hess V, E, Chirico K. A, Burgess "Morphological Characterization of Carbon Blacks in Elastomer Vulcanizates," Paper A-17 Presented to Inti. Rubber Conf., Prague, Czechoslovakia, Sept. 17-20, 1973. 

Silicone elastomer vulcanizates have relatively poor mechanical properties compared to other elastomers and plastics [as an example... 

Elastomers, vulcanizable (synthetic rubber) Epichlorohydrin elastomers Estane... 

Sircar A.K. and J.L. Wells. 1982. Thermal conductivity of elastomer vulcanizates by differential scanning calorimetry. Rubber Chem. Technol. 55 191—207. 

MCLCP based onl-(4-hydroxy-4-o-bisphenyl)-2-(4-hydroxyl-phenyl)-butane and an n-methylene spacer group thermoplastic elastomer vulcanizate thermo-stimulated current twin-screw extruder... 

The gas permeability of polyurethane elastomer vulcanizates is very low, on the order of that of butyl rubbers. 

The oil swelhng resistance of silicone elastomer vulcanizates is similar to that of chlo-roprene rubber vulcanizates. Sihcone elastomers are resistant to certain heat transfer fluids but not to motor fuels, chlorinated hydrocarbons, esters, ketones, and ethers. 

Reinforcement. There is little agreement on the mechanism for reinforcement of elastomers by fillers in elastomer vulcanizates. Some investigators believe that chemical... 

Ethylene-methyl acrylate copolymer (EA, E/EA) n. An elastomer vulcanizable with peroxides or diamines. It resists attack by oils and temperatures to 175°C. 

The most important characteristic of silicone elastomer vulcanizates is their maintenance of physical properties over a large temperature range. General purpose material is serviceable over the approximate range —50 to 200°C but both ends of the range may be extended by the use of special purpose compounds. When elastomers are exposed to air at temperatures above 200°C, cross-linking and embrittlement slowly occur in the absence of air chain scission and softening predominate (cf., fluids). 

Sahoo BP, Naskar K, Tripathy DK (2012) Conductive carbon black-filled ethylene acrylic elastomer vulcanizates physico-mechanical, thermal, and electrical properties. J Mater Sci 47 2421... 

Some of the key properties of PAREL elastomer vulcanizates are summarized in Table I. They have excellent low teiqierature properties excellent dynamic properties, which are much like those of natural rubber good ozone resistance and good heataging resistance. This interesting combination of properties is leading to substantial specialty markets in such applications as automotive engine mounts. Vulcanization and stabilization studies on PAREL elastomer, as well as additional specific properties of PAREL elastomer, are reported in this book by Boss. 

Tan 6 of Parel elastomer vulcanizates and of three other rubbers is plotted against temperature in Figure 10 these data... 

Sircar, A. K., Analysis of Elastomer Vulcanizate Composition by TG-DTG Techniques, Paper presented at a Rubber Division Meeting, ACS, Toronto, Ontario, Canada (May 21-24, 1991)... 

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