REPROCESSING OF LIQUID-CRYSTAL POLYMERS - EFFECTS ON STRUCTURE AND MECHANICAL PROPERTIES

摘要

The effects of reprocessing by successive injection molding cycles on the structure and properties of two thermotropic liquid-crystal polymers (LCPs), namely Rodrun and Vectra, were analyzed. Reprocessing produces a clear decrease in the melt viscosity of both LCPs. This is attributed to molecular weight decreases as a consequence of chemical reactions. The reactions produced chain scission in both LCPs and new products in the case of Vectra. This gave rise to modifications in the crystalline behavior of Vectra that did not take place in the case of Rodrun. All these facts lead to, with the exception of the modulus of elasticity of Rodrun, an overall decrease in properties, more marked in the case of Vectra. (C) 1995 John Wiley & Sons, Inc. [References: 21]