| Summary: | 碩士 === 國立臺北科技大學 === 化學工程研究所 === 99 === Polymeric foam has many different applications, including thermal insulation, weight reduction and improved fatigue resistance. Adding nanoparticles to polymer foam may improve its physical properties and provide it with various new functions . In this study, polystyrene-nano-graphite/graphene nanocomposite foams made by different dispersion methods were investigated. Different compounding methods such as direct compounding, pulverized sonication compounding and in-situ polymerization were investigated to understand the effect they have on the morphology of nanocomposites and their foam. Polymer nanocomposite foam was made by batch foaming technique using CO2 as the blowing agent. Various foaming pressures and temperatures were studied to understand the effect of processing variables. The results indicate that the cell size was decreased and the cell morphology was improved with the advanced dispersion of nanoparticles. Among the three methods, the in-situ polymerization method provided the best result. This method gave the smallest cell size and the highest cell density. By adding 1wt% of nanoparticle using the in-situ polymerization method, the cell size can be as small as 1wt% 1.64μm while the cell density reaches 1.11×1011 cell/cm3. In addition, it is worth noting that adding nanoparticles as a nucleating agent can make foams of similar cell size and cell density with a much lower foaming pressure. This character could open up a new route for the production of microcellular foam.
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