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Polymer00025 - permanent set ultimate mechanical properties...

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14 elastomer particles dispersed in a relatively small amount of plastic. The elastomer particles should be crosslinked to promote elasticity. This favorable morphology should remain during the fabrication of the material into parts, and during end use. The usual methods for preparing elastomer/plastic blends by melt mixing, solution blending, or latex mixing are not sufficient since elastomer phase cannot be cured during processing. The best way to produce thermoplastic elastomeric composites comprising vulcanized elastomer particles in melt-processable matrices is by a method called dynamic vulcanization (Holden, et al. 2004). It is the process of vulcanizing an elastomer during its melt-mixing with a non-vulcanizing thermoplastic polymer. Small elastomer droplets are vulcanized to give a particulate vulcanized elastomer phase of stable domain morphology during melt processing. The main purpose of the dynamic vulcanization of elastomer-plastic blends is to produce compositions which have the improvement in
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Unformatted text preview: permanent set, ultimate mechanical properties, fatigue resistance, hot oil resistance, high-temperature utility, melt strength, and thermoplastic fabricating ability. In this study, Mixing of ingredients of the formulated composites and dynamic vulcanization of the elastomer was performed using a Haake torque rheometer. This device is shown in Figure 1.6. The Haake torque rheometer is an innovative torque rheometer platform designed to optimize process engineering applications. Data for melt characteristics, viscosity under shear load and the effectiveness of additives, heat and shear stability are readily attainable with this system. A typical mixer test is run at a defined speed (shear rate) versus time, and the material’s response is recorded as torque. The mixing chamber is temperature-controlled precisely by independent heating and cooling zones, but due to the frictional heat in the...
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