Effect of polypyrrole deposition of carbon fiber on the thermal expansion of carbon fiber-epoxy composites |
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Authors: | Jeng-Shyong Lin |
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Affiliation: | (1) Van Nung Institute of Technology, Chung-Li, Tao-Yuan, 320, Taiwan, R.O.C. |
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Abstract: | Polypyrrole (PPy) was deposited onto carbon fibers via continuous electrochemical deposition (ECD). Composites of PPy-deposited
carbon fiber and epoxy were prepared. The thermal expansion coefficients of these materials were determined using either a
thermal mechanical analyzer or an imbeded strain gauge. The results show that PPy has a negative thermal expansion coefficient
while carbon fiber and epoxy have positive thermal expansion coefficients. The resulting composite has a smaller thermal expansion
coefficient, higher interlaminar shear stress and a smaller critical fiber length than the composite using untreated carbon
fiber. This suggests that the deposition of PPy can effect an improvement in the fiber-matrix interfacial bonding of the composite. |
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Keywords: | Polypyrrole Electrochemical deposition Carbon fiber Composite Thermal expansion coefficient Interlaminar shear stress Critical fiber length |
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