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Indexed by:期刊论文

Date of Publication:2013-12-01

Journal:Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica

Included Journals:EI、PKU、ISTIC、Scopus

Volume:30

Issue:SUPPL.

Page Number:59-64

ISSN No.:10003851

Abstract:Novel oligomeric poly(aryl ether) phthalonitriles (PBD-Phs) were prepared by utilizing a nucleophilic displacement reaction between 4-(4-hydroxyphenyl)-2, 3-phthalazin-1-one (DHPZ) and 4-bis(4-fluophenyl)-6-phenyl-1, 3, 5-triazine(BFPT) under alkaline conditions through shifting the stoichiometric ratio of each monomer. Then 4-nitrophthalonitrile was added to get oligmers with phthalonitrile end unites on both sides. And all of them could be cured to the thermosetting materials bearing phenyl-s-triazine structure(Th-PBD) in the presence of a small amount of the curing additive-4, 4'-aminophenyl sulfone in definite curing procedure. 1H-NMR and FT-IR have been used to confirm and monitor the structures of the products, which was proved to be in accordance with the molecule design. DSC and Rheology tests were carried to investigate the thermosetting properties of PBD-Ph1 including melting points and the curing viscosity shifting curves. Additionally, the reaction activation energy was calculated 60.06 kJ/mol by Kissinger equation via different heating rate in DSC scanning. Rheology tests demonstrate the series of PBD-Ph oligmers could all be melted below 450  C. However, the viscosity of each polymer expressed a increasing-then-decreasing tendency in the presence of 4, 4'-aminophenyl sulfone, which has provided a new processing method. The result of TGA shows that the cured products have good heat resistance. The temperature for 5% weight loss of Th-PBD-Ph1 tested by TGA in nitrogen is beyond 513  C. Additionally, the char yield of them in 900  C is more than 60%, indicating their outstanding thermal stability. DMA was used to analyses the thermo mechanical properties of the C fiber composite of Th-PBD-Ph1 with storage modulus being about 9 GPa at 400  C and Tg surpassing 400  C. SEM indicate that the hang quantity of cement of C fiber composites was high, and the resins adhere to fibers closely.