用 PGC/MS 法鉴定环氧乙烷-环氧丙烷三嵌段共聚物

Identification of PEOPPOPEO TriblockCopolymer by PGC/MS

目的用裂解气相色谱／质谱法（ＰＧＣ／ＭＳ）鉴定环氧乙烷－环氧丙烷三嵌段共聚物．方法用裂解气相色谱（ＰＧＣ）法及裂解气相色谱／质谱（ＰＧＣ／ＭＳ）法分别对聚环氧乙烷、聚环氧丙烷和环氧乙烷－环氧丙烷三嵌段共聚物在合适的色谱及质谱条件下进行分析．结果与结论样品在质谱分析的总离子流图１６．１３ｍｉｎ处给出了聚环氧乙烷、聚环氧丙烷中没有的混杂二聚体，它们是这类三嵌段共聚物在高温下裂解产生的特征峰．并推断了这两种混杂二聚体在质谱中的断裂方式．

Aim To identify PEOPPOPEO triblock copolymer using PGC/MS techniques Methods The polyethylene oxide (PEO), polypropylene oxide (PPO) and PEOPPOPEO triblock copolymers were analyzed by pyrolysis gas chromatography/mass spectrometry (PGC/MS) under suitable operating condition Results and Conclusion On total ion chromatograms of PGC/MS for PEOPPOPEO triblock copolymers the hybrid characteristic pyrolyzates were found at 1613 min These two compounds are very useful to confirm the copolymer structure and the copolymerization processes The possible fracture position of hybrid dimers in mass spectrometry were deduced