| Physical and Chemical Properties | Chemical properties tensile strength 1.55MPa, tensile modulus 90MPa, initial decomposition temperature 657.3 ℃. |
| Use | Applications for liquid crystal materials. |
Synthesis of monomer: The monomer is a polycondensation reaction of 4-hydroxy-3-aminobenzoic acid hydrochloride in a polyphosphoric acid medium. The monomer is made of methyl p-hydroxybenzoate (Ethyl ester) is a raw material and purified in two steps.
Synthesis of films and fibers for the synthesis of polybenzo [oxazole] ABPBO: The hydrochloride of 3-amino-4-hydroxybenzoic acid is polymerized under the initiation of an initiator, hydrochloric acid is removed, and then in the presence of phosphorus pentachloride, The polymer obtained by reacting at 90-190°C, the polymer solution is pushed into the film, and the oriented film is condensed in the aqueous solution, or use the polymer solution to dry spray wet spinning technology to obtain light yellow polymer fibers, wash in a water bath, and dry and heat treat under tension.