The effect of hydroxyl-terminated polybutadiene-grafted carbon fiber on the impact performance of carbon fiber–epoxy resin composites

✍ Scribed by Fábio L. Barcia; Bluma G. Soares; Marianna Gorelova; José A. Cid

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 279 KB
• Volume: 74
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19991107)74:6<1424::aid-app15>3.0.co;2-2

✦ Synopsis

Carbon fiber (CF) containing 1.4 and 2.1 mmol/g of -COOH and -OH groups, respectively, was functionalized by using an excess of tolylene-2,4-diisocyanate. The NCO-modified CF was submitted to a graft reaction with hydroxyl-terminated polybutadiene (HTPB). The HTPB-grafted carbon fiber was employed as reinforcing agent for epoxy resin-based composites. The presence of the flexible HTPB at the interface between the fiber and the matrix resulted in a substantial improvement on impact strength. Additional improvement on toughness was achieved by using epoxy matrix containing dispersed phase of HTPB. The composite morphology was also studied by scanning electron microscopy.