Impact performance of phenolic composites following thermal exposure

✍ Scribed by Stephen G. Kuzak; John A. Hiltz; Phillip A. Waitkus

• Book ID: 101251191
• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 393 KB
• Volume: 67
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19980110)67:2<349::aid-app16>3.0.co;2-t

✦ Synopsis

The notched and unnotched Izod impact properties of a series of phenolicglass composites following thermal exposure at 180ЊC, 300ЊC, and 800ЊC have been investigated. Four phenolic resins; a resol, a novolac, a resol/novolac blend, and a furan-novolac/resol copolymer were used to prepare the composites. The notched and unnotched impact properties of all S-glass composites improved following thermal exposure at 180ЊC for times up to 28 days. The best results at 180ЊC were obtained for the copolymer-based composite. However, thermal exposure at 300ЊC for times greater than 1 day led to significant reduction in the performance of this composite. The best retention of impact properties folowing exposure at 300ЊC and 800ЊC was found for the composite made with the resol/novolac blend. The results indicate that the impact properties of phenolic composites made with modified resins, that is, a blended resol/ novolac or a furan-novolac/resol copolymer resin, improve significantly.