Thermal and mechanical characterization of amine-epoxy/Kevlar fibre composites

✍ Scribed by Suay Antón, J J; Monleón Pradas, M; Gómez Ribelles, J L

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 150 KB
• Volume: 48
• Category: Article
• ISSN: 0959-8103
• DOI: 10.1002/(sici)1097-0126(199912)48:12<1269::aid-pi304>3.0.co;2-l

✦ Synopsis

Experimental results of dynamic-mechanical measurements and differential scanning calorimetry are compared for a pure diglycidyl-type epoxy/tetrafunctional aliphatic amine system and for a composite containing Kevlar ®bres as reinforcement. The presence of ®bres had marked effects on the curing reaction, depending on the curing temperature. At low curing temperatures, the extent of the reaction was lower for reinforced than for neat formulations. For higher curing temperatures, the thermograms shifted to shorter times as the ®bre content increased. In dynamic curing, an increase in the ®bre content affected the curing kinetics by slightly shifting the heat ¯ow curves to higher temperatures, and resulted also in a reduction of the glass transition temperature of the matrix if postcuring was not applied. The dependence of the dynamic-mechanical spectra of the samples on ®bre content was satisfactorily modelled with the aid of Takayanagi's block model. An analysis of the main relaxation master curve shows that relaxation broadens as ®bre content increases.