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采用热裂解气相色谱-质谱联用技术建立了聚氨酯纤维、二烯类和聚烯烃3种弹性纤维的鉴别方法。裂解温度为600℃时,可以最大限度同时显示聚氨酯纤维、二烯类和聚烯烃3种弹性纤维样品特征。聚氨酯纤维的特征性裂解产物是:不同聚合度(—O—CO—N—)n的中间体;特征离子碎片峰是荷质比(m/z)=71。二烯类纤维的特征性裂解产物是:异戊二烯及它的同分异构体和同系物、柠檬烯及它的同分异构体、β-律草烯及它的同分异构体、西柏烯及它的同分异构体等;特征离子碎片峰是m/z=68、79、93等。聚烯烃纤维的特征性裂解产物是:烯烃和烷烃;特征离子碎片峰是m/z=55、57等。
The identification methods of three kinds of elastic fibers, polyurethane, diene and polyolefin, were established by pyrolysis gas chromatography-mass spectrometry. Pyrolysis temperature of 600 ℃, you can maximize the simultaneous display of polyurethane fibers, dienes and polyolefins three kinds of elastic fiber sample characteristics. The characteristic cleavage products of polyurethane fibers are: intermediates of different degree of polymerization (-O-CO-N-) n; characteristic ion fragment peak is the charge-to-mass ratio (m / z) = 71. The characteristic cleavage products of diene fibers are: isoprene and its isomers and homologues, limonene and its isomers, beta-lawnhene and its isomers , Cypress and its isomers, etc .; characteristic ion fragment peak is m / z = 68,79,93 and so on. Characteristic cracking products of polyolefin fibers are: olefins and alkanes; characteristic ion fragment peaks are m / z = 55, 57 and the like.