JIN Ningren, LI Chen, HU Xiaofeng, et al. AB monomers of hydroxy modified PBO and its novel synthesis technology[J]. CIESC Journal, 2015, (5): 1955-1963.
JIN Ningren, LI Chen, HU Xiaofeng, et al. AB monomers of hydroxy modified PBO and its novel synthesis technology[J]. CIESC Journal, 2015, (5): 1955-1963.DOI: 10.11949/j.issn.0438-1157.20141644.
The molecular structure of a monohydroxy modified PBO and its AB monomer were proposed
and 2-hydroxy-4-(5-amino-6-hydroxybenzoxazole-2-yl) benzoic acid(HABA)was synthesized by the condensation-cyclization reaction of 4-amino-6-nitroresorcinol hydrochloride(ANR·HCl)and hydroxy terephthalic acid(HTA)
then 2-hydroxy-4-(5-nitro-6-hydroxybenzoxazole-2-yl) benzoic acid(HNBA)was reduced to obtain the AB monomer (HABA). The precursor HNBA was one-pot prepared from ANR·HCl and HTA with a yield of 69.25% and purity of 96.81%
and the AB monomer HABA with a purity >98% was obtained by reducing HNBA
with a total yield of 58.38% from ANR·HCl. The novel synthesis technology had the characteristics of convenient source of raw materials
short reaction steps
mild conditions
excellent stability and equi-molar polycondensing group. HABA and HNBA were identified with FT-IR