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SummaryThree polyacrylonitrile fibers were oxidative stabilized by two heat treatment modes. OM and SEM were utilized to analyze the microstructure of oxidative stabilized fibers. In experiment I (by stepwise increasing temperature), no skin-core structure occurs in the polished cross-sections of stabilized fibers from 195 °C to 265 °C, unless they are subsequently heated by temperature higher than...
SummaryTemperature in the rearmost stabilization zone has an important impact on the final stabilization degree of PAN precursor fibers during industrial successive pre-oxidation and on their structure and properties. FTIR, X-ray diffraction, elemental analysis, ultramicrotomy and optical microscopy were used to study the slow evolution of stabilization indices and structure changes with increasing...
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