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۱Effect of Clay Loading on Mechanical Properties of Highly Filled Nanocomposites
اطلاعات انتشار: کنفرانس بین المللی فرآورش پلیمرها، سال
تعداد صفحات: ۵
Composite materials reinforced on a molecular scale are a new class of materials in which an inorganic clay mineral is dispersed in an organic polymer on a nanometre scale. These new materials show dramatic improvements in mechanical and thermal properties. But only few attempts have been made so far to achieve highly filled nanocompositesIn this work, highly filled clay nanocomposites based on asbestos– phenolic system are prepared and characterized by XRD, 3 point bending test and SEM and optical microscopy.Results reveal decreasing of modulus and flexural strength and increasing in elongation at break, with adding montmorillonite. Reduction of strength was attributed to the formation of micro–voids in the system due to the rapid increase of viscosity during mixing. The results also show that nanocomposite samples with 50 and 60 phr clay have acceptable mechanical properties in compare of composite counterpart. These systems could be used in different applications such as thermal barrier.<\div>

۲Toughening Mechanism of Polymer\ Layered Silicate Nanocomposites
اطلاعات انتشار: کنفرانس بین المللی فرآورش پلیمرها، سال
تعداد صفحات: ۴
Phenolic resin (PR) have been widely used as coating, adhesives, composites, etc. due to their excellent flame and chemical resistance, thermal stability and dimensional stability properties However their brittleness has significantly limited their widespread applications.In this work, highly filled clay nanocomposite systems based on asbestos– phenolic system are prepared and investigated by XRD, 3 point bending test, SEM and TOM microscopy.The results showed improvement of fracture toughness of highly filled nanocomposites by adding organoclay in nanocomposite.The toughening mechanism of highly filled nanocomposite is crack branching due to flake shape and strength of clay sheets.<\div>
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