PRIMARY THERMAL-DECOMPOSITION PROCESSES IN ALIPHATIC POLYAMIDES
PRIMARY THERMAL-DECOMPOSITION PROCESSES IN ALIPHATIC POLYAMIDES
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DOI：
10.1016/0141-3910(89)90066-9
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发表时间：
1989-01-01
影响因子：
5.9
通讯作者：
MONTAUDO, G
中科院分区：
文献类型：
--
作者：
BALLISTRERI, A;GAROZZO, D;MONTAUDO, G
用直接化学电离（DCI）和串联质谱（Tandem mass spectrometry）研究了一系列脂肪族聚酰胺的热分解过程，结果表明，分子内交换过程是许多聚酰胺热分解的主要机理。通过C-H氢转移反应的分解似乎是作为二次热过程发生的，除了尼龙3，因为它的特殊结构。一个完全不同的分解途径是由己二酸（尼龙6.6和11.6），其中特定的结构因素使环戊酮的形成优先尼龙3的情况。这些聚合物通过C-H氢转移至氮而分解，形成具有胺和/或酮酰胺端基的化合物。这些初级产物进一步分解或反应形成环戊酮和带有胺和/或席夫碱基团的化合物。
The primary thermal decomposition processes of a series of aliphatic polyamides were investigated by Direct Chemical Ionization (DCI) and Tandem mass spectrometry.Results show that an intramolecular exchange process is the preferred thermal decomposition mechanism for many of the polyamides. Decomposition through a C-H hydrogen transfer reaction appears to occur as a secondary thermal process, except in the case of nylon 3 because of its particular structure.A quite different decomposition pathway is followed by nylons from adipic acid (nylons 6.6 and 11.6), where specific structural factors make the formation of cyclopentanone preferred. These polymers decompose via a C-H hydrogen transfer to nitrogen with the formation of compounds having amine and/or ketoamide end groups. These primary products further decompose or react with the formation of cyclopentanone and compounds bearing amine and/or Schiff base groups.