Abstract
The effect of thermoplastic polyurethane (TPU) elastomer on the melting point and the percentage crystallinity of polyacetal (POM) is studied by differential scanning calorimetry (DSC). Wide angle X-ray diffraction (WAXD) scans of POM, TPU and their blends have been taken and the results indicate that the crystalline structure of POM remains unaffected even after the addition of amorphous TPU. The influence of defects like holes and notches on the ultimate tensile strength has been examined. The resistance to crack initiation (J c), the resistance to steady state crack propagation (R p) and the resistance to crack growth at maximum load (R max) are estimated. The POM/TPU blends display higher crack resistance values than pure POM. The hysteresis energy of blends is determined and is found to increase with TPU content.
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References
R. B. Seymour, “Rubber Toughened Plastics”, edited by C. K. Riew (American Chemical Society, Washington, DC, 1989).
European Patent, 121, 407 (1984); U.S. Patent, 479, 942 (1983).
E. A. Flexman, Jr., Mod. Plast. February (1985) 72.
F. C. Chang and M. Y. Yang, Polym. Engng Sci. 30 (1990) 543.
R. John, N. R. Neelakantan and N. Subramanian, Polym. Engng Sci. 32 (1992) 20.
F. Kloos and E. Wolters, Kunststoffe 75 (1985) 735.
U. S. Patent, 625, 954 (1984); European Patent, 167, 369 (1986).
J. M. Machado and R. N. French, Polymer 33 (1992) 439.
B. Wunderlich, “Macromolecular Physics, volume-3: Crystal Melting” (Academic Press, New York, 1980).
B. H. Kim and C. R. Joe, Polym. Test. 7 (1987) 355.
Idem and C. R. Joe, Engng Fract. Mech. 34 (1) (1989) 221.
C. J. Ong and F. P. Price, J. Polym. Sci., Symp. 63 (1978) 45.
W. Y. Chiang and M. S. Lo, J. Appl. Polym. Sci. 36 (1988) 1685.
C. S. Ha and S. C. Kim. J. Appl. Polym. Sci. 35 (1988) 2211.
D. J. Ihm, C. S. Ha and S. C. Kim, Polymer (Korea) 12 (1988) 249.
N. S. Murthy, H. Minor, M. K. Akkapeddi and B. Van Buskirk, J. Appl. Polym. Sci. 41 (1990) 2265.
D. M. Otterson, B. H. Kim and R. E. Lavengood, J. Mater. Sci. 26 (1991) 1478.
C. B. Lee and F. C. Chang, Polym, Engng Sci. 32 (1992) 792.
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Kumar, G., Neelakantan, N.R. & Subramanian, N. Polyacetal and thermoplastic polyurethane elastomer toughened polyacetal: crystallinity and fracture mechanics. Journal of Materials Science 30, 1480–1486 (1995). https://doi.org/10.1007/BF00375252
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DOI: https://doi.org/10.1007/BF00375252