Formation of skin-core in carbon fibre processing: A defect or an effect?

• DOI: 10.3144/expresspolymlett.2019.14
• Publication Date: 2018-12-03T09:28:37Z
• Authors: S. Nunna; M. Setty; M. Naebe
• Keywords: Carbon fibers

The influence of stabilized fibre structure and skin-core formation induced by rapid thermal stabilization polyacrylonitrile (PAN) on the tensile properties carbon fibres was investigated.Three sets samples were prepared stabilizing PAN under three temperature profiles using a continuous processing line.Initially, chemical density variations in examined with respect to process conditions Fourier Transform Infrared Spectroscopy (FTIR) column methods.Interestingly, while cyclization dehydrogenation indices are similar for all irrespective used, densities these varied from 1.34 1.366 g/cc.Micro-Raman studies showed existence structural heterogeneity low (LT) carbonization (I(D)/I(G) ratio core ~5.6% higher than skin) that eventually reduced high (HT) because uniform sp 3 2 hybridization carbons.However, modulus mapping revealed heterogeneous storage distribution HT cross-section Trial-2 (storage ~23 GPa less skin).Interestingly, this did not show significant effect bulk suggesting is an rather defect.