Abstract
Abstract An efficient acid catalyst for the low-temperature solid-phase cyclization of poly(o-hydroxyamide) (PHA) has been found. Thermal cyclization of PHA into poly(benzoxazole) (PBO) proceeded quantitatively at 250 °C in 10 min in the presence of 10 wt % of a photoacitve compound, (5-propylsulfonyloxyimino-5H-thiophen-2-ylidene)-2-(methylphenyl)-acetonitrile (PTMA).
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