By on-line infrared spectroscopic method, the changes of chemical constitution of acy-lonitrile (AN)/diacetone acylamide (DAA)/methyl acylate (MA) copolymers have been measured continuously during its low temperature pyrolysis under different atmospheres.

• 本文用傅里叶变换红外光谱法在位连续测定了丙烯腈(AN)、二丙酮丙烯酰胺(DAA)和丙烯酸甲酯(MA)三元共聚物在不同气氛中低温热解时化学结构的变化。