Abstract
The temperature dependence of the dynamic elastic modulus, loss modulus and tan δ of phenolic-fiber-reinforced polystyrene, polypropylene and Nylon 66 (FRTP) has been measured by a resonant bending system and the reinforcing effect examined from the standpoint of the fiber content and/or the fiber size. A considerable improvement of the dependence of E′ for PS and Nylon 66 can be seen. For PP, however, a large decrease of the value of E′, which is attributed to a shrinkage due to a morphological change in the matrix, can be seen in the higher temperature region for a low fiber content. The fiber content dependence of E′ and E″ for these matrices shows a nearly linear relation except in the decreasing region in the case of PP. It is found that the system of fiber mixed with fiber powder is a better reinforcing method for a wide temperature range for PS and PP resins.
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