Abstract. One kind of thermally reversible cross-linking agents for improving PVC thermally stability was synthesized. The chemical structure and thermally reversible characteristics of cross-linking agents were investigated by FTIR and DSC analysis, respectively. FTIR results confirmed that the cyclopentadienyl barium mercaptides ((CPD-C 2 H 4 S) 2 Ba) were successfully synthesized. DSC results showed it has thermally reversible characteristics and the depolymerization temperature was between 170 and 205 . The effects of cross ℃ ℃ -linking reaction time on gel content of Poly(vinyl chloride) compounds was evaluated. The gel content value arrived at 42% after being cross-linked for 25 min at 180 . The static th ℃ ermally stability measurement proved that the thermally stability of PVC compounds was improved.
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 phydroxybenzoic 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 pacetoxybenzoic acid, the precursor of polyoxybenzoate, during the fabrication of polyoxybenzoate based composite material.
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