Identification of PA56， PA66 and PA6 Through Pyrolysis Gas Chromatography⁃mass Spectrometry

doi:10.19491/j.issn.1001-9278.2021.11.018

Abstract

Abstract:

Pyrolysis gas chromatography-mass spectrometry （Py-GC/MS） was conducted to identify polyamide 56， polyamide 66， polyamide 6 and their blends. The 100 % relative abundances of polyamide 56 and polyamide 66 were cyclopentanone at a pyrolysis temperature of 550 ℃， which were differentiated with the characteristic pyrolytic products of 1，8?diazabicyclotridecane-2，7-dione and 1，8?diazabicyclotetradecane-2， 7-dione. Meanwhile， polyamide 6 obtained 100 % relative strength of caprolactam. This made it possible to quickly identify industrial primary products of polyamide 56， polyamide 66 and polyamide 6. With this method， polyamide 6/56 blends， modified polyamide 6/66 blends and modified polyamide 66 can be detected successfully.

Key words: pyrolysis?gas chromatograph?mass spectrometry, polyamide 56, polyamide 66, polyamide 6, identification

CLC Number:

TQ 323.6

HU Huilian, SHI Jialiang, LANG Lei, SHI Chaoou, YAO Jianlei. Identification of PA56， PA66 and PA6 Through Pyrolysis Gas Chromatography⁃mass Spectrometry[J]. China Plastics, 2021, 35(11): 120-124.

Figures/Tables 9

Fig.1. Total ion current diagram of PA56/PA66/PA6 at 550 ℃

序号	保留时间/min	名称	标记	相对丰度
序号	保留时间/min	名称	标记	PA56	PA66	PA6
1	4.34	吡啶	PY	7	-	-
2	5.29	环戊酮	CP	100	100	-
3	6.20	5?己烯?1?胺	AC6	-	17	-
4	8.70	戊二胺	AA5	15	-	-
5	11.77	己内酰胺	M1	-	9	100
6	18.56	1，8?二氮杂环十三烷?2，7?二酮	M3	44	-	-
7	19.35	1，8?二氮杂环十四烷?2，7?二酮	M4	-	56	-
8	19.46	1，8?二氮杂环十四烷?2，9?二酮	M5	-	-	15

Tab.1. Pyrolytic products of PA56/PA66/PA6

Fig.2. Relationship between the main pyrolyzates of PA56 and breakage position

Fig.3. Relationship between the main pyrolyzates of PA66 and breakage position

Fig.4. Relationship between the main pyrolyzates of PA6 and breakage position

Fig.5. Total ion current diagram of unknown sample A/B/C at 550 ℃

Fig.6. Mass spectrum of cyclopentanone， caprolactam and 1，8?diazabicyclotridecane?2，7?dione

Fig.7. Mass spectrum of caprolactam， styrene and cyclopentanone

Fig.8. Mass spectra of styrene， cyclopentanone and 1，8?diazabicyclotetradecane?2，7?dione

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