- Phthalonitrile-functionalized poly(ether imide) oligomers derived from phthalazinone-containing dianhydride: facile synthesis, curing and properties
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- 论文类型： 期刊论文
- 发表时间： 2018-03-01
- 发表刊物： POLYMER BULLETIN
- 收录刊物： SCIE、EI、Scopus
- 卷号： 75
- 期号： 3
- 页面范围： 1037-1054
- ISSN号： 0170-0839
- 关键字： Poly(ether imide); 4-Phenyl phthalazinone; Phthalonitrile oligomer; Thermal property
- 摘要： A novel series of soluble and curable poly(ether imide) oligomers (PPEI-Phs) containing phthalazinone moiety and terminal phthalonitrile groups were prepared from an excess amount of phthalazinone-based dianhydride and 4,4'-diaminodiphenyl ether, followed by being end-capped with 4-(3-aminophenoxy)phthalonitrile in a two-step, one-pot reaction. The phthalazinone-based PPEI-Phs were cured by a heating treatment procedure up to 350 A degrees C, in the presence of 4,4'-diaminodiphenylsulfone to obtain the cross-linked polymers (cPPEI-Phs). Fourier transform infrared and elemental analysis was utilized to confirm the chemical structures of the resultant oligomers and cross-linked polymers. PPEI-Phs exhibited good solubility in polar aprotic solvents, such as N-methyl pyrrolidone, m-cresol and pyridine, partially soluble in N,N-dimethyl-2-acetamide and chloroform, while the cross-linked cPPEI-Phs were insoluble in all tested solvents, even in sulfuric acid. Furthermore, the gel content of the cPPEI-Phs samples ranged from 96 to 88%, which confirmed the formation of cross-linked network. PPEI-Phs showed high glass transition temperature (T (g)) ranged from 225 to 286 A degrees C as determined by differential scanning calorimetry, however, no detectable T (g) was observed after thermal curing. cPPEI-Phs exhibited T (d5%) in the range of 529-545 A degrees C, which is up to 49 A degrees C higher than the PPEI-Phs, indicating the crosslinking structures of cPPEI-Phs. Moreover, all of cPPEI-Phs displayed high limited oxygen index up to 46.7, which can be attributed to the formation of N-heterocyclic s-triazine or phthalocyanine structures during the curing procedure.
