Synthesis, characterization and thermal degradation of poly[2-(3-p-bromophenyl-3-methylcyclobutyl)-2-hydroxyethylmethacrylate]

✍ Scribed by Demirelli, Kadir; Coşkun, Mehmet

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 140 KB
• Volume: 48
• Category: Article
• ISSN: 0959-8103
• DOI: 10.1002/(sici)1097-0126(199912)48:12<1244::aid-pi292>3.0.co;2-w

✦ Synopsis

In this work, 2-(3-p-bromophenyl-3-methylcyclobutyl)-2-hydroxyethylmethacrylate (BPHEMA) [monomer] was synthesized by the addition of methacrylic acid to 1-epoxyethyl-3bromophenyl-3-methyl cyclobutane. The monomer and poly(BPHEMA) were characterized by FT-IR and [ 1 H] and [ 13 C]NMR. Average molecular weight, glass transition temperature, solubility parameter, and density of the polymer were also determined. Thermal degradation of poly [BPHEMA] was studied by thermogravimetry (TG), FT-IR. Programmed heating was carried out at 10 °C min À1 from room temperature to 500 °C. The partially degraded polymer was examined by FT-IR spectroscopy. The degradation products were identi®ed by using FT-IR, [ 1 H] and [ 13 C]NMR and GC-MS techniques. Depolymerization is the main reaction in thermal degradation of the polymer up to about 300 °C. Percentage of the monomer in CRF (Cold Ring Fraction) was estimated at 33% in the peak area of the GC curve. Intramolecular cyclization and cyclic anhydride type structures were observed at temperatures above 300 °C. The liquid products of the degradation, formation of anhydride ring structures and mechanism of degradation are discussed.