The stabilization behavior of poly (acrylonitrile-co-itaconic acid) (PAI) by using electron beam irradiation (EBI) was investigated to identify the role of itaconic acid (IA). EBI was employed as a tool to generate radicals, which induced a “cold” stabilization reaction at room temperature and excluded ionic and thermally induced radical-mediated stabilization reactions. Fourier transform infrared spectroscopy was employed to quantitatively track the structural evolution of the PAI during stabilization. The stabilization reactions of the PAIs successfully progressed with higher EBI dosages at room temperature. More efficient cyclization reactions were observed for the PAIs with increased amounts of IA, because of the increased amorphous regions of the PAIs with a higher level of IA. The extents of the cyclization values of the PAIs normalized to their crystallinity values were similar to each other regardless of the IA contents, indicating the absence of an ionic initiation mechanism of IA at room temperature. In addition, the incorporation of IA units in PAIs increased the polarity and oxophilicity of the PAIs, thereby inducing facilitated oxygen uptake reactions, as evidenced by the high concentrations of conjugated carbonyl groups in the stabilized structures.
Polymer Degradation and Stability – Elsevier
Published: Jul 1, 2018
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