Accession Number : ADA305120

Title :   Liquid Crystal Polyester-Carbon Fiber Composites.

Descriptive Note : Final rept.,

Corporate Author : CELANESE RESEARCH CO SUMMIT NJ

Personal Author(s) : Chung, Tai-Shung

PDF Url : ADA305120

Report Date : MAY 1984

Pagination or Media Count : 50

Abstract : Liquid crystal polymers (LCP) have been developed as a thermoplastic matrix for high performance composites. A successful melt impregnation method has been developed which results in the production of continuous carbon fiber (CF) reinforced LCP prepreg tape. Subsequent layup and molding of prepreg into laminates has yielded composites of good quality. Tensile and flexural properties of LCP/CF composites are comparable to those of epoxy/CF composites. LCP/CF composites have better impact resistance than the latter, although epoxy/CF composites possess superior compression and shear strength. LCP/CF composites have good property retention until 200 deg F (67% of room temperature value). Above 200 deg F, mechanical properties are found to decrease significantly. Experimental results indicate that the poor compression and shear strength may be due to the poor interfacial adhesion between the matrix and carbon fiber as well as inadequate toughness of the LCP matrix. Low mechanical property retention at high temperatures may be attributed to the low beta-transition temperature (around 80 deg C) of the LCP matrix material. jg p50

Descriptors :   *POLYMERS, *COMPOSITE MATERIALS, *CARBON FIBERS, *LIQUID CRYSTALS, *POLYESTER FIBERS, COMPRESSION, MECHANICAL PROPERTIES, PRODUCTION, INTERFACES, HIGH TEMPERATURE, LAMINATES, RESISTANCE, TENSILE PROPERTIES, ADHESION, MELTS, TOUGHNESS, MATRIX MATERIALS, ROOM TEMPERATURE, IMPACT STRENGTH, RETENTION(GENERAL), THERMOPLASTIC RESINS, EPOXY COMPOSITES, PREPREGS, MOLDINGS, FLEXURAL PROPERTIES, REINFORCING MATERIALS, SHEAR STRENGTH, IMPREGNATION.

Subject Categories : Laminates and Composite Materials
      Polymer Chemistry
      Textiles
      Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE