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Heat resistance of EPDM ternary ethylene propylene rubber |
| release time：2018-07-25 viewed：3799次 |
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Each cycle produces additional free radicals, represented by heavier arrows.The two free radicals can combine to terminate each other and create new crosslinks.
The formation of new crosslinks leads to hardening and embrittlement.In general, for these rubber polymers, including EPDM, elongation changes are the most sensitive aging indicators.Due to the limited space available in this publication, only the elongation change is provided, but the full set of attributes of the measurement can be obtained by contacting the references listed in the author's request. Some polymers tend to reverse or break down in the presence of free radicals.It is favorable for fracture in branched polymer or polymer with many side groups.During aging, tert - alkyl or carbon free radicals are produced, which undergo decay or single-molecule cracking to form fragments with lower molecular weight, known as restitution.Natural rubber and butyl rubber are two polymers that are degraded by reversals.The most sensitive aging indicator of these polymers is usually used after tensile strength changes or stretching of X elongation products. The mechanism of antioxidants Antioxidants are materials that interfere with any step of the oxidation process, as shown in figure 2.However, some steps are easier to avoid than others. The initiation actually depends on the strength of the carbon-carbon bond.If the polymer absorbs too much energy, the adhesive will break.Only the structure of the polymer determines how much energy is allowed. |
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