Abstract
Ultrasonically-aided extrusion of two thermotropic LCPs based on 6-oxy-2-naphthoyl and p-oxybenzoyl moieties (LCP1), and p-oxybenzoyl, terephthaloyl and hydroquinone moieties (LCP2) and their blends that are partially miscible was investigated. Ultrasonic treatment induced structural changes in the components, leading to improved mechanical properties of LCP1 moldings, and degradation of LCP2. Also, the ultrasonic treatment was found to further improve the partial miscibility of the blends. Although LCP1 and LCP2 behaved differently under ultrasonic treatment, synergistic effects on fibrillation and mechanical properties of blends were observed in injection moldings. Mechanical properties of melt spun fibers of blends lied between those of the components. Lack of synergism in mechanical properties of fibers was primarily attributed to saturation of LCP2 orientation at low draw down ratios in fiber spinning.
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References
M. V. Tsebrenko, A. V. Yudin, T. I. Ablazova, and G. V. Vinogradov, Polymer 17, 831 (1976).
A. I. Isayev, in Liquid Crystalline Polymer Systems Technological Advances, ACS Symp. Ser., 1996, vol. 632, pp. 1–20.
M. J. Stachowski and A. T. DiBenedetto, Polymer Engineering and Science (Washington, D. C.) 38, 716 (1998).
S. Kenig, M. T. DeMeuse, and M. Jaffe, Polym. Adv. Technol. 2, 25 (1991).
S. Akhtar and A. I. Isayev, Polym. Eng. Sci. 33, 32 (1993).
P. Chen, Sr., V. Sullivan, T. Dolce, and M. Jaffe, US Patent No. 5,182,334 (1991).
C. M. McCullagh, J. Blackwell, and A. M. Jamieson, Macromolecules 30, 4837 (1997).
A. I. Isayev and C. K. Hong, Polym. Eng. Sci. 43, 91 (2003).
A. I. Isayev, C. K. Hong, and K. J. Kim, Rubber Chem. Technol. 76, 923 (2003).
H. Lin and A. I. Isayev, J. Appl. Polym. Sci. 102, 2643 (2006).
K. Gunes and A. I. Isayev, Int. J. Polym. Technol. 1, 1 (2009).
H. N. Yoon, F. Charbonneau, and G. W. Calundann, Adv. Mater. (Weinheim, Fed. Repub. Ger.) 4, 206 (1992).
W. N. Kim and M. M. Denn, J. Rheol. (N. Y.) 36, 1477 (1992).
T. G. Fox, Bulletin of the American Physical Society 1, 123 (1956).
H. Thapar and M. Bevis, Plastics and Rubber Processing Applications 12, 39 (1989).
L. C. Sawyer and M. Jaffe, Journal of Materials Science 21(6), 1897 (1986).
R. Ding and A. I. Isayev, J. Thermoplastic Composite Materials 8, 208 (1995).
F. Shi, Intern. J. Polymeric Mater. 23, 207 (1994).
G. Crevecoeur and G. Groeninckx, Polymer Engineering and Science 30(9), 532 (1990).
H. Sugiyama, D. N. Lewis, J. L. White, and J. F. Fellers, Journal of Applied Polymer Sci. 30, 2329 (1985).
Q. Lin and A. F. Yee, Polymer 35(16), 3463 (1994).
W. C. Lee, A. T. DiBenedetto, J. M. Gromek, M. R. Nobile, and D. Acierno, Polymer Engineering and Science 33(3), 156 (1993).
Y. Qin, Journal of Applied Polymer Science 54, 735 (1994).
S. C. Joshi, Y. C. Lam, C. Y. Yue, K. C. Tam, L. Li, and X. Hu, Journal of Applied Polymer Science 90, 3314 (2003).
C. H. Song and A. I. Isayev, Journal of Polymer Engineering 20(6), 427 (2000).
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Gunes, K., Isayev, A.I. Ultrasonically-aided extrusion of blends of two thermotropic LCPs. Polym. Sci. Ser. A 52, 1124–1136 (2010). https://doi.org/10.1134/S0965545X10110064
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DOI: https://doi.org/10.1134/S0965545X10110064