Microstructural Morphology of Molded Thin Composites of Thermotropic Liquid Crystalline Polymer and Polyamide 6

서모트로픽 액정폴리머와 폴리아미드6으로 성형된 얇은 복합재료의 미세구조형태

  • Published : 2000.07.01


Microstructural morphology of molded composites of thermotropic liquid crystalline polymer(LCP) and polyamide 6 (PA6) has been studied as a function of epoxy fraction. Injection-moulding of a thin composite plaque at a temperature below the melting point of the LCP fibrils by suing the extruded LCP/PA6 pellets produced multi-layered structures: 1) the surface skin layer with thickness of 65-120 ym exhibiting a transverse orientation, 2) the sub-skin layer with an orientation perpendicular to the surface skin, i.e. in the flow direction, 3) the core layer with arc-curved flow patterns. Similar microstructural orientations were observed in the respective layers for the composite plaques with different fractions of epoxy.


Thermotropic Liquid Crystalline Polymers;Polyamide 6;Injection Moulding;Multi-layered Structure;Thermal Stress Analysis


  1. Kim, B. C., Hong, S. M., Hwang, S. S. and Kim, K. U., 1996 'A Study on the Ternary Blends of Polyphenylenesulfide, Polysulphone and Liquid Crystalline Polyesteramide,' Polymer Engineering and Science, Vol. 36, pp. 574-582
  2. Datta, A., Chen, H. H. and Baird, D. G., 1993, 'The Effect of Compatibilization on Blends of Polypropylene with a Liquid-Crystalline Polymer,' Polymer, Vol. 34, pp. 759-766
  3. Joslin, S., Jackson, W. and Farris, R., 1994, 'The Thermal and Mechanical Behavior of Poly (Ethylene Terephthalate) Fibers Incorporating Novel Thermotropic Liquid-Crystalline Copolymers,' Journal of Applied Polymer Science, Vol. 54, pp. 439-455
  4. Fung, Y. C., 1994, A First Course in Continuum Mechanics, (Prentice Hall Inc., NJ) p. 183
  5. Ansys version 5.3, User's manual
  6. Kenig, S., Trattner, B. and Anderman, H., 1998 'Orientation Development in Molding of Short-Fiber Liquid Crystalline Polymer Composites,' Polymer Composites, Vol. 9, pp. 20-26
  7. 최낙삼, Takahashi, K. 1999, '액정폴리머/폴리아미드6 미시복합재료의 내부구조 및 기계 적굽힘성능 평가,' 한국복합재료학회지, 투고중
  8. Shin, B. Y. and Chung, I. J., 1990, 'Speculation on Interfacial Adhesion and Mechanical Properties of Blends of PET and Thermotropic Polyester With Flexible Spacer Groups,' Polymer Engineering and Science, Vol. 30, pp. 13-29
  9. Siegmann, A., Dagan, A. and Kenig, S., 1985 'Polyblends Containing a Liqid Crystalline Polymer,' Polymer, Vol. 26, pp. 1325-1330
  10. Kurokawa, M. and Nagai, S., 1999, 'Reinforcement of Polyamide 6 With Thermotropic Liquid Crystalline Polymer,' Polymer Engineering and Science, Vol. 39, pp. 872-880
  11. Beery, D., Kenig, S. and Siegmann, A., 1991, 'Structure Development During Flow of Polyblends Containing Liquid Crystalline Polymers,' Polymer Engineering and Science, Vol. 31, pp. 451-458
  12. Ophir, Z. and Ide, Y., 1983, 'Injection Molding of Thermotropic Liquid Crystal Polymers,' Polymer Engineering and Science, Vol. 23, pp. 792-796
  13. Bassett, B. R. and Yee, A. F., 1990, 'A Method of Forming Composite Structures Using in Situ-Formed Liquid Crystal Polymer Fibers in a Thermoplastic Matrix,' Polymer Composites., Vol. 11, pp. 10-18
  14. Isayev, A. I. and Modic,M., 1987, 'Self-Reinforced Melt Processible Polymer Composites: Extrusion, Compression, and Injection Molding,' Polymer Composites, Vol. 8, pp. 158-175
  15. Gonzalez-Nunez, R., Favis, B. D. and Carreau,P.J., 1993 'Factors Influencing the Formation of Elongated Morphologies in Immiscible Polymer Blends During melt Processing,' Polymer Engineering and Science, Vol. 33 pp .851-859
  16. Wu, J. S., Friedrich, K. and Grosso, M., 1989, Impact Behaviour of Short Fiber/Liquid Crystal Polymer Composites,' Composites, Vol. 20, pp. 223-233
  17. Choi, N. S., Takahashi, K., 1996, 'Toughness and Microscopic Fracture Mechanisms of Unfilled and Short-Glass0Fiber-Filled Poly (Crsno Srylether),' Journal of Materials Science, Vol. 31, pp. 731-740