摘要
采用质谱、色谱和锥形量热仪研究了自由基聚合的聚甲基丙烯酸甲酯 (PMMA)燃烧过程中CO和CO2 的生成机理及恒温条件下的燃烧情况。结果表明 ,在有氧条件下 ,自由基聚合的PMMA的解聚方式有三种 ,除了链末端的双键断裂和主链上的无规则C—C键的断裂外 ,还存在侧链酯基的断裂 ,其主要产物为CO2 和CH3 OH ;在燃烧过程中 ,单体MMA的氧化为主要的耗氧反应 ,其产物为CO2 和少量的CO ,并且CO2 和CO的产率与反应温度以及样品的厚度基本无关 ,通过耗氧量估算得出 ,PMMA在空气中燃烧反应的热效应大约为 2 2 9MJ/kg。
The mechanism of the formation of CO and CO 2 in the combustion process and the combustion characteristics of PMMA in isothermal condition were investigated by using mass spectrometry, gas chromatography and cone calorimeter There are three models for thermal decomposition process of free radically polymerized PMMA: random chain breaking model; end chain scission model and β scission at the C-C bond of the pendant group Oxidation of monomer MMA is main oxygen consumption reaction in the combustion process of PMMA, and the products are CO 2 and small amount of CO In additional, reaction temperature and thickness of sample have unimportant effects on the yield of CO 2 and CO According to the oxygen consumption principle, combustion heat of PMMA is about 22 9?MJ/kg
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2002年第2期151-155,共5页
Journal of Fuel Chemistry and Technology
基金
香港理工大学策略性学术发展领域高密度都市先进建筑科技基金资助 (1 A0 3 8)~~
