The Raman spectra of PA66 and the PA66/Di−PE composites residual chars were obtained with a laser Raman spectrometer (Renishaw inVia Reflex, Renishaw Co., Miskin, UK) using a 532 nm helium–neon laser line focused on a micrometer spot on the sample surface and scanning in the 2000–800 cm−1 region.
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