Rubber Process Oils for Peroxide Curing of Ethylene—Propylene Elastomers

1992 ◽  
Vol 65 (2) ◽  
pp. 385-395 ◽  
Author(s):  
Kent L. Chasey
Keyword(s):  
Free Radical ◽  
Analytical Methods ◽  
Molecular Structures ◽  
Combined Effects ◽  
Stress Strain ◽  
Ethylene Propylene ◽  
Peroxide Curing

Abstract Ten rubber process oils were evaluated in a peroxide-cured EPDM compound. The effects of the process oil on cure-development characteristics and stress—strain properties are discussed. Certain types of molecular structures in the oil can significantly interfere with free-radical vulcanization, and analytical methods for the detection of these structures are provided. The combined effects of the process oil and the peroxide—coagent concentration are also described.

Peroxide Curing of Ethylene-Propylene Elastomers

1988 ◽  
Vol 61 (2) ◽  
pp. 238-254 ◽  
Author(s):  
Robert C. Keller
Keyword(s):  
Free Radicals ◽  
Service Life ◽  
Chain Scission ◽  
Organic Peroxides ◽  
Stress Strain ◽  
Ethylene Propylene ◽  
Compression Set ◽  
Ethylene Content ◽  
Peroxide Curing ◽  
Improved Performance

Abstract 1. Ethylene-propylene elastomers, suitably compounded for extrusion applications, can be readily vulcanized with organic peroxides to meet emerging requirements of improved performance and longer service life. 2. Aralkyl or dialkyl classes of peroxides produce the preferred cure performance, highest physical properties, and lowest compression set. Choice of peroxide governs rate of cure but not necessarily the optimum in crosslinking efficiency. 3. Coagents are essential to the development of optimum cure and stress-strain properties. The bis-maleimide is very effective in compounds that contain significant quantities of process oil, antioxidants for increased heat resistance, or other materials that consume free-radicals. 4. Ethylene-propylene compositional parameters influencing vulcanization activity are the diene, both type and concentration, and the ethylene content. Reactivity of the terpolymers is dependent on the type and amount of diene utilized in the polymer synthesis. High ethylene content improves crosslinking efficiency because there are fewer propylene sequences where chain scission can occur. 5. Increasing levels of hydrocarbon process oil needed in fast extruding compounds require higher peroxide concentrations to maintain cure and stress-strain properties.

Polyisocyanates as Curing Adjuvants for Ethylene—Propylene Terpolymers

1964 ◽  
Vol 37 (4) ◽  
pp. 927-933
Author(s):  
J. R. Wolfee ◽  
J. R. Albin
Keyword(s):  
Tensile Strength ◽  
Low Cost ◽  
New Method ◽  
Mineral Filler ◽  
High Modulus ◽  
Stress Strain ◽  
Ethylene Propylene ◽  
Reinforcing Fillers ◽  
Light Color ◽  
Mineral Fillers

Abstract Ethylene—propylene—nonconjugated diene terpolymers yield vulcanizates of high modulus and tensile strength in the presence of strongly reinforcing fillers. In many applications where low cost, light color, or nonconductivity are required, it is necessary to use poorly reinforcing mineral fillers. The combination of poorly reinforcing mineral filler and amorphous EP terpolymer yields vulcanizates which do not have the excellent stress-strain properties characteristic of many black loaded stocks. The purpose of this paper is to present a new method of obtaining superior properties in mineral filled EP terpolymer vulcanizates.

Functionalization of an amorphous ethylene-propylene copolymer by free radical initiated grafting of unsaturated molecules

1984 ◽  
Vol 22 (6) ◽  
pp. 1335-1347 ◽  
Author(s):  
G. De Vito ◽  
N. Lanzetta ◽  
G. Maglio ◽  
M. Malinconico ◽  
P. Musto ◽  
...  
Keyword(s):  
Free Radical ◽  
Ethylene Propylene

Synthesis, Characterization and Crystal Structures of 1,2-Disubstituted Ferrocenyl Stibines

2012 ◽  
Vol 67 (1) ◽  
pp. 36-40
Author(s):  
Diego Pérez ◽  
Pankaj Sharma ◽  
Ana M. Ortiz ◽  
Armando Cabrera ◽  
Simon Hernández ◽  
...  
Keyword(s):  
Solid State ◽  
Acetic Anhydride ◽  
Nucleophilic Substitution ◽  
Sodium Hydroxide ◽  
Crystal Structures ◽  
Analytical Methods ◽  
Molecular Structures ◽  
X Ray ◽  
X Ray Crystallography ◽  
Pendant Arm

New 1,2-disubstituted ferrocenyl stibines containing a -CH2OR pendant arm were synthesized and characterized by various spectral and analytical methods. Nucleophilic substitution of rac-diphenyl[( 2-trimethylammoniomethylferrocen-1-yl)]stibine iodide by methanol produces compound Fc(CH2OMe)SbPh2 (1). The acetylation of diphenyl(2-dimethylaminomethylferrocen-1-yl)stibine by acetic anhydride affords compound Fc(CH2OCOCH3)SbPh2 (2), which on further reaction with sodium hydroxide affords the alcohol Fc(CH2OH)SbPh2 (3). The molecular structures of the stibines 1, 2 and 3 were determined by X-ray crystallography. None of the heterobimetallic compounds containing a -CH2OR arm shows hypervalent interactions in the solid state. By contrast, hypervalent interactions were found in ferrocenyl stibines with a -CH2NR2 pendant arm.

Thermoelastic Measurements on Some Elastomers

1968 ◽  
Vol 41 (5) ◽  
pp. 1148-1156
Author(s):  
J. A. Barbie ◽  
J. Standen
Keyword(s):  
Stress Strain ◽  
Ethylene Propylene ◽  
Temperature Range ◽  
Strain Data ◽  
Gaussian Theory ◽  
Mooney Equation

Abstract Length versus temperature curves at a series of constant loads have been obtained for cis-polyisoprene, polydimethylsiloxane and ethylene propylene elastomers in the temperature range 25° to 100° C. Thermoelastic coefficients for these networks are evaluated and compared with values obtained by more direct procedures. The deviation of the stress strain data from the simple gaussian theory is discussed briefly in terms of the C2 constant of the Mooney equation.

Sign in / Sign up

Export Citation Format

Share Document