Thermal degradation behaviors of poly (arylene ether nitrile) bearing pendant carboxyl groups

被引：27
作者：
Yang, Xulin [1 ]
Li, Ying [1 ]
Lei, Wenwu [1 ]
Liu, Xidi [1 ]
Zeng, Qian [1 ]
Liu, Qiancheng [2 ]
Feng, Wei [1 ]
Li, Kui [1 ]
Wang, Pan [1 ]
机构：
[1] Chengdu Univ, Sch Mech Engn, Chengdu 610106, Sichuan, Peoples R China
[2] Chengdu Univ, Inst Adv Study, Chengdu 610106, Sichuan, Peoples R China
来源：
POLYMER DEGRADATION AND STABILITY | 2021年 / 191卷
关键词：
Poly (arylene ether nitrile); Diphenolic acid; Thermal degradation; TG-MS technique; Degradation mechanism; DECOMPOSITION; COMPOSITES;
D O I：
10.1016/j.polymdegradstab.2021.109668
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Poly (arylene ether nitrile) (PAEN) bearing pendant carboxyl groups integrates the outstanding performances of special thermoplastics with the merit of solubility and has been extensively employed to prepare advanced composites for uses in dielectric and fluorescence field. This study firstly reported the thermal pyrolysis behavior of diphenolic acid (DBA)-based PAEN characterized by TG/DTG, TG-FTIR and TG-MS technique under non-oxidizing gaseous environment. It is found that PAEN showed third-order degradation mechanism: (i) Side chain degradation starts at 350-480 degrees C in the pentanoic acid moiety and -CN groups, resulting in the main pyrolysis products of Ph-CH2-Ph-O-Ph or Ph-Ph-O-Ph by releasing CH4, H2O, HCN, CO, HCHO, CH3OH, CO2, HCOOH, C4H8. (ii) Main chain pyrolysis was caused by cleavages of C-C and C-O bond in backbone at 480-650 degrees C, mainly releasing aromatic compounds including C6H6, C7H8, C6H6OH, C6H6OCH3, etc. (iii) Carbonization happened over 650 degrees C and finally formed an extended aromatic array of graphite. The obtained results not only help our understanding for the identification, structural determination, and thermal resistance of PAEN materials, but also will guide molecular design of poly arylene ethers with higher thermal durability. (C) 2021 Elsevier Ltd. All rights reserved.
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页数：9
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