Factors Which Influence the High Temperature Adhesive Characteristics of Liquid Crystalline Copolyesters |
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| Authors: | J. Economy A. G. Andreopoulos |
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| Affiliation: | a Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, U.S.A.b Department of Chemical Engineering, NTU of Athens, Athens, Greece |
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| Abstract: | Liquid crystalline copolyesters of p-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid, with compositions 20/80 and 24/76, were studied in order to evaluate the effect of higher melting HBA/HNA copolyesters on the high temperature adhesive properties compared with data for the recently reported 73/27 system. A tetramer of HBA/HNA with a composition of 24/76 was synthesized to examine the effect on adhesion of wetting of the substrate at much lower temperatures. From the results of this study it is now possible to define approaches for achieving very good adhesion characteristics at temperatures well in excess of 250°C. |
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| Keywords: | high temperature adhesives liquid crystalline copolyesters interchain transesterification chemically induced ordering glass transition temperature: Annealing processability lap shear strength oligomer |
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