Comparative investigation of photo- and thermal-oxidation processes in poly(butylene terephthalate)

Poly (ethylene terephthalate) thermo-mechanical and thermo-oxidative degradation mechanisms

“…Matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS) has become a valuable technique to study the thermal [16,17], photo-oxidative [18] thermo-oxidative [18,19], plasma-oxidative [20] and hydrolytic degradation [20,21] of PET and other polyesters at the processing temperature. Whereas these studies have elucidated important degradation mechanisms, they were not performed with samples from typical industrial polymer processing conditions during thermo-mechanical recycling.…”

Molecular mechanism of photolysis and photooxidation of poly(neopentyl isophthalate)

“…This technique allows studying individual polymer chains as a function of exposure time. In recent years the successful application of this technique to study the mechanisms of thermal and photodegradation of polymers has been demonstrated [13][14][15], including PBT [16]. The main goal of this work is to present the application of MALDI-ToF MS to study the photodegradation of poly(neopentyl isophthalate) (PNI).…”

Thermal Stability and Thermal Degradation Kinetics of Poly(Trimethylene-co-Butylene Terephthalate) Copolymers

“…[11] Several researchers [12][13][14][15][16][17][18][19] have studied the mechanism and products of PBT decomposition. Passalacqua et al [12] investigated the mechanism of thermal degradation of PBT between 240 • C and 280 • C and reported that the thermal degradation of PBT at these processing temperatures took place at the ester linkage.…”

“…Huang et al [16] believed that the main reaction products of decomposition of PBT in supercritical methanol were dimethylterephthalate (DMT) and 1,4-butanediol by methanolysis, and the degradation mainly included random scission and chain-end scission reactions and side reactions for monomer components. Carroccio et al [17] compared the thermal-and photo-oxidation processes of PBT and found that two thermal-oxidation processes and two photo-oxidation cleavages were unambiguously ascertained to occur in PBT. Chiu and Wu [18] compared the thermal and catalytic degradation of PBT at atmospheric pressure and found that the gaseous product distribution for PBT thermal and catalytic degradation were almost the same, with the major products being ethane, carbon monoxide, carbon dioxide, 1-butene, 2-butene, 1,3-butadiene, and butadiene dimer.…”