Abstract
Polybenzoxazines consisting of chemical structures that differ from conventional polybenzoxazines were obtained at relatively lower temperature with the aid of Lewis acids. It is confirmed by FTIR spectra that the new polybenzoxazines mainly consist of arylamine Mannich-type linkage other than phenolic Mannich-type linkage in conventional polybenzoxazines. Owing to the unique chemical structures, the arylamine Mannich polybenzoxazines possess more weak −OH···π hydrogen bonding but less strong and rigid chelated hydrogen bonding. As a result of the special chemical structures and hydrogen bonding distribution, the arylamine Mannich polybenzoxazines possess many unique properties. For example, they are more flexible. Tensile tests show that the arylamine Mannich polybenzoxazines could be stronger and tougher than phenolic Mannich polybenzoxazine. The highest tensile strength increases 83% while elongation at break value increases 115% for 002P180 (arylamine Mannich polybenzoxazine) compared with PBA-a200 (p...
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