The Use Of Alumina In Adhesive: Flexible Polymer Ceramic Composite

Zurina, Zaul Kafilai (2006) The Use Of Alumina In Adhesive: Flexible Polymer Ceramic Composite. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Traditionally, filler were considered as additives, which, due to their unfavorable geometrical features, surface area or chemical composition, could only moderately increase the modulus of the polymer, while strength (tensile, flexural) remained unchanged or even decreased. The term reinforcing filler has been coined to describe discontinuous additives, the form,shape, and/or surface chemistry of which have been suitably modified with the objective of improving the mechanical properties of the polymer, particularly strength. Inorganic reinforcing fillers are stiffer than the matrix and deform less, causing an overall reduction in the matrix strain, especially in the vicinity of the particle as a result of the particle/matrix interface. Reinforcing filler are characterized by relatively high aspect ratio, a , defined as the ratio of length to diameter for a fiber, or the ratio of diameter to thickness for platelets and flakes. For spheres or powder, which has minimal reinforcing capacity, the aspect ratio is unity. A useful parameter for characterizing the effectiveness of a filler is the ratio of its surface area, A, to its volume, V, which needs to be as high as possible for effective reinforcement.Technologically, the most important composites are those in which the dispersed phase is in the form of a fiber. Design goals of fiber-reinforced composites often include high strength and/or stiffness on a weight basis. These characteristics are expressed in terms of specific strength and specific modulus parameters, which correspond, respectively, to the ratios of tensile strength to specific gravity and modulus of elasticity to specific gravity. Fiber-reinforced composites with exceptionally high specific strengths and moduli have been produced that utilize low-density fiber and matrix materials.

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