By Raymond B. Seymour
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Extra info for Additives for Plastics. State of the Art
7. 8. HARDWOOD KRAFT COTTON CELLULOSE 2 5000 1 YOUNG * S 4 MODULUS, psi (8=0°) Χ 10" 4000 ,13 / 1 /C9 NON-CELLULOSE 3000 •12 • 11 2000 10 1000 9. O R L O N A C R Y L I C 10. POLYPROPYLENE 11. WOOL 12. NYLON 13. 5 Elongation % at Yeild 1,140 935 875 1,345 2,695 3,200 2,000 2,410 2,850 2,400 2,205 2,480 2,840 2,500 Tensile Strength Yield 0° 65 50 15 55 25 30 65 75 75 65 60 55 80 60 Proportional Limit (90%) % of Strength Unregenerated cellulose fibers are ribbon-like, hence the effective aspect ratio is higher than what was measured.
Aspect ratio of the fibrous fraction of talcs depends on the type of asbestos that it contains. The talc shown in Fig. IB contains tremolite and anthophyllite, with fiber diameters about 1/10 that of wollastonite but much lower in aspect ratio. C. Scope Mineral fibers available and currently used in commercial plastic composites are described, with illustrations intended for comparing the different types and grades, the bases for their selection, and advantages or disadvantages of each relat ed to end use.
The rate of longitudinal tensile creep is an inverse function of Young's modulus. This is illustrated by Fig. 18. Since the modulus was changed by varying the fiber concentra tion, again, the constraining effect of the fibers is obvious. The fatigue characteristics of cellulose short fiber/ elastomer composites was studied using tensile test specimens. The specimens were repeatedly loaded in the Instron in the predominant fiber orientation under various loads. The number of cycles to failure was recorded for each load.
Additives for Plastics. State of the Art by Raymond B. Seymour