【摘要】 采用DSC、TGA、IR及PGC等方法对AN-VDC共聚体纤维在空气中受热过程中发生的化学变化进行分析。结果表明,在250℃以下,共聚体化学结构无明显变化;在250℃,共聚体脱除HCl,该反应的温度几乎不受共聚体组成的影响,在300～320℃处,共聚体分子链中AN序列的CN基发生环化,适当提高VDC含量有利于降低环化温度,在500℃附近,共聚体完全分解,并生成大量低分子碎片。更多还原

【Abstract】 The chemical reactions which toke place while AN-VDC copolymer was heated in air were studied with the help of DSC, TGA, IR , PGC. The results are as follow, The copolymer eliminates HC1 at 250℃, the copolymer composition doesn’t influnce the reaction temperature, the CN groups in AN sequnce in AN-VDC copolymer cyclizes at 300-320℃, the cyclization temperature decreases with the increase of VDC content to some extent; the copolymer completely decomposites to form a large amount of small moleculars at 500℃.更多还原