Abstract
The present paper attempts the quantitative determination of the polymerisation degree and mass fraction of polyoxybenzoate in the polyoxybenzoate based composite coatings sintered on 1045 steel test blocks. The determinations were carried out successfully via the analysis of p‐hydroxybenzoic acid hydrolysed from polyoxybenzoate in a KOH solution by use of high performance liquid chromatography. The polymerisation degree of polyoxybenzoate increased with the reaction time and temperature, in particular when catalysed. The maximum polymerisation degree was 27·6 under the optimised conditions. The determined mass fraction of polyoxybenzoate in composite coatings deviated greater than 10% from the theoretical values either blocked or not. This is possibly due to the incomplete inhibition of the sublimation of p‐acetoxybenzoic acid, the precursor of polyoxybenzoate, during the fabrication of polyoxybenzoate based composite material.
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