文献类型：期刊文献

英文题名：Phthalonitrile Containing Branched Cyanine: Structure, Curing, and Its Properties

作者：Liu, Xiwei[1];Liu, Yumeng[1];Hu, Jianke[1];Wang, Yitian[1];Hu, Yanhong[1,2]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Specially Funct Polymer Mat & Related Tech, Minist Educ, Shanghai 200237, Peoples R China;[2]Fudan Univ, State Key Lab Mol Engn Polymers, Shanghai 200438, Peoples R China

年份：2024

卷号：6

期号：11

起止页码：6508

外文期刊名：ACS APPLIED POLYMER MATERIALS

收录：;EI(收录号：20242216175619);WOS:【SCI-EXPANDED(收录号:WOS:001231829100001)】；

基金：This work was supported by the Fundamental Research Funds for the Central Universities (JKD01241701) and the Open foundation of State Key Laboratory of Molecular Engineering of Polymers (Fudan University).

语种：英文

外文关键词：phthalonitrile resin; branched cyano; oxygen-promotedcuring; nitrogen-containing heterocycles; high-temperatureresistance

摘要：In order to improve the reliability of phthalonitrile resins in extreme service environments, a high cyanodensity phthalonitrile monomer (BPN) containing branched cyano groups was synthesized from 3,4-dihydroxybenzonitrile and 4-nitrophthalonitrile and characterized by H-1 NMR and FTIR. It was found that polymerized BPN (p-BPN) exhibited excellent thermal properties with a T-d5 of 540 degrees C when tested in N-2 in the thermogravimetric analysis (TGA), as well as a glass transition temperature (T-g) of p-BPN1 exceeded 480 degrees C when tested in the dynamic mechanical analysis (DMA). A comprehensive study was conducted to gain a detailed understanding of the diverse curing mechanisms in realistic operational settings. The results from TGA and in situ FTIR in different atmospheres demonstrated that oxygen plays a beneficial role in the thermal stability of the cured resin. The weight gain observed at lower temperatures is attributed to oxidation, which results in the formation of heat-resistant structures such as imide rings. The flexural strength of QF/p-BPN1 was 446.4 and 266.3 MPa, respectively, after treatment at room temperature and 500 degrees C, with high retention at 59.7%.