用CDSC法考察AN/IA/MA共聚纤维热解初期的热量释放规律

THE INVESTIGATION OF THE HEAT EVOLUTION OF AN/IA/MA COPOLYMERIC FIBRE DURING THE INITIAL STAGES OF PYROLYSIS BY CDSC METHOD

描述了补偿式示差扫描量热(CDSC)法考察丙烯腈(AN)/衣康酸(IA)/丙烯酸甲酯(MA)共聚纤维在氮气气氛中热解初期的热量释放情况.提出了该样品在热解时,分子中发生环化反应所生成的聚合热的释放规律遵循一级动力学反应.根据阿累尼乌斯方程得到吉林聚丙烯腈(PAN)原丝在本实验条件下,分子中腈基环化反应的活化能为91.030kJ/mol.同时,基于加热速度对其放热量的影响,获得了吉林PAN原丝在本体系中的表观活化能.

By the comparative differential scanning oalorimetry (CDSC) method, the heat evolution of the acrylonitrile (AN) /itaoonic aoid (IA) /methl aery late (MA) oopolymerio fibre during the initial stages of pyrolysis was studied in nitrogen atmosphere. From the CDSC measurements, it was observed that the sharp intense exotherm, occurring on a temperature-programmed pyrolysis, was related to the reaction of nitrile groups in the fibre. A first order kinetic equation was deduced for the thermal degradation of the AN/IA/MA oopolymerio fibre studied. Eelevant kinetic parameters of exo-thermie process were obtainedand discussed. For the sample of Jilin Eesearch Institute of Chemical Technology, it was shown that cyolization occurred mainly; the oyolization activation energy was calculated to be 91.030kJ/mol. and the apparent activation energy was determined. Wherefore, we believe that the results are valuable and may play an important role in the improvement of the operating condition of the stabilization of polyacrylonitrile (PAN) precursors on the industrial scale.