© Studies On A Terephthalic Acid And Dihydroxydiphenyl Sulfone Liquid Crystalline Copolymer And Its Composites With Different Thermoplastics Khan, KA; Kahraman, R; Hamad, EZ; Ali, SA; Hamid, SH JOHN WILEY SONS INC, JOURNAL OF APPLIED POLYMER SCIENCE; pp: ; Vol: 64 King Fahd University of Petroleum & Minerals Summary A liquid crystalline polymer (LCP) was synthesized by an interfacial polycondensation reaction at room temperature from terephthaloyl chloride and p,p'- dihydroxydiphenyl sulfone. The LCP synthesized was so stable and molecularly rigid that it did not show any phase transition until it degraded at about 320 degrees C. Composites of the LCP with polycarbonate (PC), polystyrene (PS), and sulfonated polystyrene (SPS) were formed by compression molding at a temperature at which the thermoplastic matrix was in the melt state. They were thermally analyzed by differential scanning calorimetry. Tensile specimens were cut from the compression- molded plates, and mechanical tests were performed. The morphology of the material systems was studied by performing scanning electron microscopy analysis on cryogenically fractured specimens. For LCP/PS and LCP/SPS systems, a sharp two- phase morphology was formed, which suggested poor interfacial adhesion. The tensile strength of both systems decreased with LCP addition. The LCP/PC system also revealed a two-phase morphology; however, the interfaces between the LCP domains and the PC matrix were not so well defined, showing better interfacial adhesion than the two previous systems studied. Stronger bonding between the LCP and PC resulted in a significant improvement in the mechanical behavior of PC by LCP addition. (C) 1997 John Wiley Sons, Inc. Copyright: King Fahd University of Petroleum & Minerals;

© References: *ASTM, 1992, ANN BOOK ASTM STAND, P167 ANTOUN S, 1981, J POLYM SCI POL CHEM, V19, P1901 CHANG JH, 1995, POLYM ENG SCI, V35, P1605 CHAPLEAU N, 1992, POLYM ENG SCI, V32, P1876 COLLYER AA, 1992, LIQUID CRYSTAL POLYM CRAWFORD RJ, 1987, PLASTICS ENG CREVECOEUR G, 1990, POLYM ENG SCI, V30, P532 EARECKSON WM, 1959, J POLYM SCI, V40, P399 GAUTHIER M, 1989, MACROMOLECULES, V22, P3756 GUPTA AK, 1983, POLYMER, V24, P596 HANDLOS AA, 1996, POLYM ENG SCI, V36, P378 HE JS, 1995, POLYM ENG SCI, V35, P1695 HSU TC, 1993, POLYM ENG SCI, V33, P860 ISAYEV AI, 1992, POLYM ENG SCI, V32, P85 JO WH, 1992, POLYM J, V24, P519 KODAMA M, 1992, POLYM ENG SCI, V32, P267 KOHLI A, 1989, POLYM ENG SCI, V29, P573 KRICHELDORF HR, 1992, MACROMOLECULES, V25, P5465 LI XG, 1994, J APPL POLYM SCI, V51, P1913 MAKOWSKI HS, 1975, , US MANSOUR ME, 1981, J MACROMOL SCI CHEM, V16, P651 MEHTA A, 1991, POLYM ENG SCI, V31, P971 OGATA N, 1993, J MATER SCI, V28, P3228 PAINTER PC, 1991, MACROMOLECULES, V24, P3929 ROVIELLO A, 1975, J POLYM SCI POL LETT, V13, P455 SKOVBY MHB, 1990, J POLYM SCI POL CHEM, V28, P75 STEVENS T, 1991, MATER ENG, V102, P29 VERHOOGT H, 1993, POLYM ENG SCI, V33, P754 VERHOOGT H, 1994, POLYM ENG SCI, V34, P453 WEIDMANN G, 1990, STRUCTURAL MAT, P332 For pre-prints please write to: Copyright: King Fahd University of Petroleum & Minerals;