Synthesis and Thermal Decomposition of Poly(dodecamethylene terephthalamide)
Synthesis and Thermal Decomposition of Poly(dodecamethylene terephthalamide)
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DOI：
10.1002/app.34416
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发表时间：
2011-12-05
影响因子：
3
通讯作者：
Zhao, Qingxiang
中科院分区：
文献类型：
--
作者：
Liu, Minying;Li, Kaifeng;Zhao, Qingxiang
以对苯二甲酸和1，12-十二烷二胺为原料，通过缩聚反应合成了一种半芳香族聚酰胺聚十二亚甲基双酰胺（PA12T）。用傅里叶变换红外光谱、核磁共振氢谱和元素分析对合成的PA12 T进行了结构表征。研究了PA12T的力学性能。采用差示扫描量热法、热重分析法和动态力学分析法研究了PA12T的热行为。采用裂解-气相色谱/质谱联用技术（Py-GC/MS）分析了PA12 T的裂解产物及热分解机理。PA12 T的熔融温度（T-m）、玻璃化转变温度（T-g）和分解温度（T-d）分别为310 ℃、144 ℃和429 ℃。热解产物的Py-GC/MS分析结果表明，热解产物主要由苯甲腈、1，4-苯二甲腈、N-甲基苯甲酰胺、N-己基苯甲酰胺和芳香族化合物等32种化合物组成。热解机理主要为β-CH氢转移、主链无规断裂和水解。(C)2011 Wiley Periodicals，Inc. J Appl Polym Sci 122：3369 - 3376，2011
A kind of semiaromatic polyamide, poly(dodecamethylene terephthalamide) (PA12T) was synthesized via a polycondensation reaction of terephthalic acid and 1,12-dodecanediamine. The structure of prepared PA12T was characterized by Fourier transform infrared spectroscopy, proton nuclear magnetic resonance (H-1-NMR), and elemental analysis. The mechanical properties of PA12T were also studied. The thermal behavior of PA12T was determined by differential scanning calorimetry, thermogravimetric analysis, and dynamic mechanical analysis. Pyrolysis products and thermal decomposition mechanism of PA12T were analyzed by pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). Melting temperature (T-m), glass transition temperature (T-g), and decomposition temperature (T-d) of PA12T are 310 degrees C, 144 degrees C, and 429 degrees C, respectively. The Py-GC/MS results showed that the pyrolysis products were mainly composed of 32 kinds of compounds, such as benzonitrile, 1,4-benzenedicarbonitrile, N-methylbenzamide, N-hexylbenzamide, and aromatic compounds. The major pyrolysis mechanisms were beta-CH hydrogen transfer process, main-chain random scission, and hydrolytic decomposition. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 122: 3369-3376, 2011