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The synthesis and thermal properties of oligo‐3‐hydroxybenzaldehyde synthesized by oxidative polycondensation
Author(s) -
Mart H.,
Sökmen T.,
Yürük H.
Publication year - 2006
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.23537
Subject(s) - condensation polymer , thermogravimetric analysis , dispersity , polymer chemistry , polymerization , oligomer , chemistry , phenylene , thermal stability , aqueous solution , fourier transform infrared spectroscopy , molar mass distribution , nuclear chemistry , organic chemistry , polymer , chemical engineering , engineering
Polymerization of 3‐hydroxybenzaldehyde was investigated by oxidative polycondensation (OP) method. No polycondensation reaction was observed both in acidic (in CH 3 COOH) and organic (in THF) media. Polycondensation was carried out with hydrogenperoxide (H 2 O 2 ) in an aqueous alkaline medium at 90°C. The product was characterized by 1 H NMR, 13 C NMR, FTIR, UV–vis, and elemental analysis. The number average molecular weight, mass average molecular weight, and polydispersity index values of O‐3HBA were found to be 3600, 8000 g mol −1 , and 2.22, respectively. The product (O‐3HBA) with reactive aldehyde and hydroxyl group was soluble in most polar organic solvents and was composed of phenylene units. Thermal properties of the oligomer were investigated by thermogravimetric analyses under an air atmosphere. The weight loss of O‐3HBA was found to be 5 and 50% at 231 and >1000°C, respectively. The carboneous residue of the O‐3HBA was 54% at 1000°C. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 892–897, 2006