Synthesis and Characterization of Maleimide-Capped Polyetherimides Containing Cyano and Cardo Side Groups

被引：0
|
作者：
Xiong X. [1 ]
Liu D. [1 ]
Ren R. [1 ]
Wang J. [1 ]
Li G. [2 ]
机构：
[1] Liaoning Key Laboratory of Advanced Polymeric Composites, Shenyang Aerospace University, Shenyang
[2] Aerospace Research Institute of Materials & Processing Technology, Beijing
来源：
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | 2023年 / 39卷 / 11期
关键词：
Cardo group; cyano; maleimide; polyetherimides; thermal properties;
D O I：
10.16865/j.cnki.1000-7555.2023.0259
中图分类号：
学科分类号：
摘要：
Three novel maleimide- capped polyetherimide oligomers containing cyano and Cardo side groups (CNMPEI) with different molecular weight were designed and synthesized by adjusting the ratio of intermediate diamino compound (CNMPDA) to bisphenol A diether dianhydride (BPADA). The chemical structures of the intermediates and as- prepared oligomers were characterized and analyzed by Fourier transform infrared (FT- IR) spectroscopy and hydrogen nuclear magnetic resonance (1H- NMR). The molecular weight and molecular weight distribution of the oligomers were determined by GPC. The stacking structure, solubility, curing behavior and mechanism, thermal stability, heat resistance, and mechanical properties and solvent resistance of the composites were also systematically studied. X- ray diffraction (XRD) results show a blunt diffraction peak, suggesting an amorphous structure. These oligomers have good solubility in common organic solvents, and the inherent viscosities are in the range of 0.031~0.061 dL/g. The heat flow curves of the oligomers measured by differential scanning calorimeter (DSC) display a broad curing exothermic peak above 250 ℃, maleimide and cyano groups participate in the crosslinking reaction at different temperatures. CNMPEI polymers have a good thermal stability, and the dynamic mechanical analysis (DMA) results show that the cured CNMPEI oligomers have a high heat resistance. CNMPEI/CF composites have excellent mechanical properties and solvent corrosion resistance. The results indicate that the introduction of cyano and Cardo moieties into polyetherimide chains can effectively improve their thermal properties. © 2023 Sichuan University. All rights reserved.
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页码：34 / 43
页数：9
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