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用热重-红外-质谱（TG，IR．MS）联用技术对三嵌段共聚物的热分解产物进行了表征，利用Ozawa公式和Kissinger公式研究了聚3，3-双叠氮甲基氧杂丁环／叠氮缩水甘油醚（PBAMO／GAP）三嵌段共聚物的热分解动力学，得到其分解活化能为148．40kJ／mol，指前因子lnA=33．5s^-1，通过Grane公式计算得反应级数n=1。最后，对不同产物的红外和愤谱特征峰进行了归属，实验结果证明，PBAMO／GAP三嵌段共聚物的分解产物主要有CH4／CH3＋、N2O、NO2、N3／／HN＋、HCN＋、CHO＋和NH2＋，其主要分解机理与一般烷基化合物相同，主要过程为CH2-N3分解为氮宾，氮宾经重排生成亚胺，随后有NH；生成。但其分解过程中存在经过-CH2N3进一步分解得到N3和HN3的特殊过程。

Thermogravimetry-infrared spectrum-mass spectrometry(TG- 1R-MS) simuhaneous techniques was used to study the thermal decomposition mechanism of poly3, 3-bis (azidomethyl)oxetane/glycidyl azide polymer (PBAMO/GAP) tri-block copolymer. The activation energy Ea and the pre-exponential factor A calculated by Kissinger and Ozawa method are 148.40 kJ/mol and InA = 33.5 s-1 , respectively. The order of the decomposition reaction obtained by Crane's method is n = 1. The IR/MS characteristic peaks of gas products of the decomposition were assigned. Results show that the gas products consist of CHa/CH3+ , N2O, NO2, N3/HN3, HCN+ , CHO+ and NH2+ The mechanism of thermal decomposition of the copolymer is consistent with that of common azide compounds. These typical courses could be expressed as follow: nitrene was released after the decon:position of CH2 - N3, and then rearrangement occurred, imine Was released, and then NH3. But during the decomposition of PBAMO/GAP tri-block copolymer, another routine was observed, which is the release of CH2 - N3, and then the release of N3 and HN3. Keywords: poly3, 3-bis (azidomethyl) oxetane; glycidyl azide polymer; thermal decomposition; TG-IR-MS simultaneous techniques