lecture07 - 6. MATRICES 6.1 Function of Matrix A. Bind the...

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6. MATRICES 6.1 Function of Matrix A. Bind the fibers together to become a fiber tow. B. Separate the individual fibers to promote the wetting capability. C. Protect the fibers from rubbing one another and being damaged through contact and friction. D. Ductile matrix can help to slow down the damage process of the brittle fibers. E. Matrices serve as a load transferring medium among fibers. 6.2 Ideal Matrix The ideal material for which a matrix is derived should be, initially, a low-viscosity liquid that can be converted readily to a tough, durable solid, adequately bonded to the reinforcing fibers. 6.3 Polymer Matrices A. Polymers have low density, poor mechanical properties, low thermal stability, moderate resistance to environmental degradation and good chemical resistance. They can be easily fabricated and joined. B. Polymer materials can be classified into two categories: amorphous type and partially crystalline type. The amorphous polymer can be either linear (molecular entanglement) or cross-linked, while partially crystalline polymers have high degrees of molecular order and alignment. The inability of attain a full crystallinity (depending on the type of polymer, molecular weight, and crystallization temperature) in a polymer is mainly due to the long chain structure of polymer. Some twisted and entangled segments of chain that get trapped between crystalline regions never undergo the conformational reorganization necessary to achieve a crystalline state. C. Depending on their responses to elevated temperature, amorphous polymers can be
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lecture07 - 6. MATRICES 6.1 Function of Matrix A. Bind the...

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