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Abstract Benzoxazole and its derivatives belong to
fluorescent dye. It can be prepared by reactive benzoic acid
With 2-aminophenol in the presence of condensing agent,
phosphorus pentoxide /methane sulfonic acid (PPMA). This study
prepare 4-hydroxy-3-amino-benzoic acid from 4-hydroxy-3-nitro-
benzoic acid by esterfication, hydrogenation and hydrolysis. Use
PPMA as a condensing agent to polymerize 4-hydroxy-3-amino-
benzoxazole give polybenzoxazole. This polymer belong to rigid-
rod polymer and have good heat-resisting property. The
reaction by using PPMA as condensing agent is considered to
proceed dependent upon the amount of PPMA , reaction temperature
and reaction time. The poly-benzoxazoles which synthesis in
different condition, show different heat property. However, the
heat property of poly-benzoxazoles is better than that of
2-phenyl-5-benzoxazoyl-benzoxazole. Reactive dye can form a
covalent bond with cotton in allsaline solution. The product by
coupling J-acid with triazine can react with fluorescent dye
which has amino substitutent and benzoxazole ring.The dye has
only 77% fluorscent strength of the initial bezoxazole compound.
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