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Reactive antioxidants for peroxide crosslinked polyethylene

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Figure 1: Spectral characteristic of DBPA: (A) FTIR; (B) FTIR in the carbonyl and double bond region (black) compared to that of PE-g-DBPA in blue; (C) and (D) are the 1H- and 13C- NMR spectra of DBPA, respectively
Figure 4:  Effect of peroxide concentration on the grafting efficiency on HDPE of:  AOPP (A), AOTP (B) and DBPA (C), and on the formation of their homopolymers (p-AO) and the polymer gel
Figure 5:    Effect of processing temperature on the extent of DBPA grafting at different peroxide MANUSCRIPTconcentrations (A), and on the grafting of AOPP and formation of p-AOPP at a fixed peroxide concentration of 0.005 molar ratio (to the antioxidant)
Figure 6: The effect, on the extent of HDPE crosslinking, of 0.5 w/w% reactive antioxidants  (DBPA, ACCEPTEDAOPP, AOTP) and conventional hindered phenol antioxidant Irganox 1076  (A),  and of different concentrations of the hindered phenol antioxidants (B)
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