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By Raymond B. Seymour

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Hamed and A. Y. 0 Mooney Scorch @250°F T5 min. 5 L m i n 35 m m . 5 T Since the composite can lose some or all of its moisture during mixing and curing process, the final cured composite moisture content may not appear to be related to the initial fiber moisture level. Further, it should be noted that very high moisture levels can be detrimental to the properties of the vulcanized composite. 49 Reinforcement of Polymers FIGURE 20 95%RH -*30%RH Temperature, °C 21 carbon Black Particle Size on Tensile Strength and Young's Modulus of EPDM Composites.

C. Microscopic Morphology and Fiber to Matrix Bonding Mill oriented single ply short cellulose fiber composites were used in the study of microscopic morphology. Such composites are illustrated schematically by Fig. 4. In this case, extreme anisotropy of properties would be expected. Maximum stiffness would, of course, be achieved in the fiber direction, while the stiffness across the fiber would be quite like that of elastomer. To the extent to which this ideal can be realized is given by Fig.

This would require that the fibers be so long that processing of such composites would be impossible without excessive fiber damage. On the other hand, significant increases in stiff­ ness are achieved, though still considerably less than theory. This is again because of the high modulus ratio. At any rate, fibers selected for rubber reinforcement should be as long as possible, yet not so long as to greatly impede processability of the composite. Further, the fibers should be stiff enough to constrain the matrix, yet they should resist breakage during processing.

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