A novel strategy for one-pot preparation of block copolymers of benzoxazine precursors with polyetheramines is described.

Simple benzoxazines were mixed and reacted with various phenolics such as phenol, p-nitrophenol, p-cresol, 1,3-dihyroxybenzene (resorcinol), 1,3,5-trihydroxybenzene (phloroglucinol), and N-(2-hydroxy­phenyl)­benzamide. The influence of these phenolic compounds on ring-opening polymerization temperature of benzoxazines was examined by DSC analysis. The cresol-based benzoxazine (C-a) and phenolics yielded polymers with molecular weight of around 1500 Da. Interestingly, for C-a/resorcinol- and C-a/phloroglucinol-based polymers, a second GPC trace was observed that corresponds to a few million daltons for mixing ratios of 4:1 and 5:1. Moreover, the mixtures of C-a and N-(2-hydroxy­phenyl)­benzamide gave poly­(benzoxazine–benzoxazole)­s through a new methodology eliminating the need of synthesis of ortho-amide benzoxazines. The obtained polymers were soluble and characterized in detail by 1H NMR, 13C NMR, GPC, DSC, and TGA analyses.

In this work, a new approach to vulcanize commercial poly(vinyl chloride) (PVC) at room temperature and in a relatively short time (4 h) by using elemental sulfur and an initiator such as Na2S.9H2O is reported. The obtained crosslinked polymer contains polysulfide linkages that facilitate recycling/self‐healing through dynamic S–S linkages. It is shown that PVC‐polysulfide networks could be reprocessed at 180 °C for three times. The thermal and spectral characterizations of the polymers before and after recycling are performed via FT‐IR, DSC, and TGA analyses. The potential use of the sulfur rich PVC‐polysulfide system as cathode material for Li‐S battery application is also investigated and the first discharge capacity is found to be around 610 mAh g−1 that later faded rapidly.

Photo induced cationic ring opening reactions were performed on main chain polybenzoxazine precursors by using iodonium salts. Gelation of the precursors was observed in a relatively short time upon photolysis...

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