Polymer00040 - Haake rheometer equipped with a pair of...

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29 Torque rheometry and DSC are the two most commonly used methods to determine the curing reaction and cure kinetics for a thermosetting system (Kader and Nah 2004). The fluoroelastomer FC2260 used in this study requires two curing stages: initial low temperature curing during mixing and post curing at a higher temperature. The initial curing of the FC2260 nanocomposites was studied by a torque rheometer (Haake Rheomix 600 with a mixing head of 69-mL net chamber capacity). The optimal sample weight for the highest mixing efficacy can be determined by the following equation (Rozman, et al. 2001): where M is sample weight, ρ is melt density, and Vn is net chamber volume. 60 grams of the FC2260 and the nanofiller was first added into the mixing head of the
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Unformatted text preview: Haake rheometer equipped with a pair of mixing rotors. The elastomer and nanofiller were mixed at 80 rpm and 177 o C for 3min, followed by the addition of the curing agent, DBPH-50, and the mixing was then continued for another 12 minutes. The change of mixing torque with time was recorded and used to assess the vulcanization behaviors of the FC2260 nanocomposites. The post curing of the nanofiller filled FC2260 was studied using DSC. A typical rubber vulcanization process involves multiple and complex reactions. Models have been developed to depict the reaction process and give insight to the vulcanization mechanisms. Two types of kinetic models based on DSC measurement, applicable to isothermal and M= ρ * Vn * 0.7...
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