高等规聚丙烯腈可作高强高模碳纤维的原丝,但对其预氧化过程的研究很少。为了对比,采用两种样品:高等规聚丙烯腈(iso-PAN)和无规聚丙烯腈(at-PAN),并用XRD图考察了两种PAN从线形结构过渡到环型结构的变化。为了定量地考察它们的差别,运用了JRG群子统计理论,发现随温度升高,高等规PAN比无规PAN成环越容易,环化程度高,通过计算得知PAN高等规PAN的活化能低于无规PAN,这为制造高强高模碳纤维提供了新的前提材料。 Higher isotactic polyacrylonitrile can be used as a precursor of high strength and high modulus carbon fiber, but few studies on its preoxidation process. For comparison, two samples were used: iso-PAN and at-PAN, and XRD patterns were used to examine the transition from linear to circular structure of two PANs. In order to investigate their differences quantitatively, the JRG theory of group statistics is used. It is found that the higher regiment PAN is more easily circularized than the random PAN and the higher the degree of cyclization as the temperature is raised. The activation energy of the PAN isotactic PAN is calculated Below the random PAN, which provides a new material for the manufacture of high strength and high modulus carbon fiber.