Enhanced thermal stabilities and char yields of carbon fibers reinforced boron containing novolac phenolic resins composites
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4-hydroxymethyl phenylboronic acid (4-HMPBA), phenol and formaldehyde were for the first time to synthesize boron containing novolac phenolic resins (Novolac-4-HMPBA). Its corresponding carbon fibers (CF) composites were also fabricated via the lamination followed by hot-compression. Results revealed that Novolac-4-HMPBA was successfully synthesized. Compared to common novolac phenolic resin (NPR), the corresponding decomposition temperature of 5% weight loss (T 5 ) and char yield at 800 °C (C 800 ) of cured Novolac-4-HMPBA-30 were increased to 369.1 °C and 69.7%, increased by 41.3% and 26.3%, respectively. The CF/Novolac-4-HMPBA-20 composites presented relatively higher interlaminar shear strength (ILSS) of 35.9 MPa, increased by 50.2% compared to that of CF/NPR composites. After the treatment at 800 °C for one hour under Ar atmosphere, the corresponding ILSS value of CF/Novolac-4-HMPBA-20 composite was decreased to 7.8 MPa, but still higher than that of CF/NPR composites (3.0 MPa).
KeywordsNovolac phenolic resins 4-hydroxymethyl phenylboronic acid Thermal stabilities Interlaminar shear strength
The authors are grateful for the support and funding provided by the Foundation of National Natural Science Foundation of China (Nos. 51773169 and 51403175); Space Supporting Fund from China Aerospace Science and Industry Corporation (No. 2017-HT-XG) and the Fundamental Research Funds for the Central Universities (No. 3102017jg02003).
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