A series of poly(ether sulfone) random copolymers at various loading of diphenolic acid (DPA) units were synthesized and subjected to a comprehensive kinetics degradation study to assess their thermal behaviour. Poly(ether sulfones) were synthesized from different amounts of 4,4?dihydroxydiphenylsulfone, DPA and stoichiometric quantity of 4,4?-dichlorodiphenyl sulfone by nucleophilic aromatic displacement. The apparent activation energy (E) of degradation for the prepared compounds was determined by using a kinetics literature method, discussed and compared with each other and with those obtained in the past for similar polymers. The comprehensive thermal stability evaluation was completed with the assessment of the initial decomposition temperature of the prepared copolymer, showing a good thermal performance but, in the meantime, suggesting caution as regards the percentage of functionalization setting the limit beyond which a deterioration of the physical properties of the copolymers at 30% of pendant carboxylic acid groups was observed.
Una serie di copolimeri casuali di poli(etere sulfone) a vari carichi di unità di acido difenolico (DPA) è stata sintetizzata e sottoposta a uno studio completo di degradazione cinetica per valutarne il comportamento termico. I poli(etere sulfoni) sono stati sintetizzati da diverse quantità di 4,4?diidrossidifenilsolfone, DPA e quantità stechiometrica di 4,4?-diclorodifenilsolfone mediante spostamento aromatico nucleofilo. L'energia apparente di attivazione (E) di degradazione per i composti preparati è stata determinata utilizzando un metodo di letteratura cinetica, discusso e confrontato tra loro e con quelli ottenuti in passato per polimeri simili. La valutazione complessiva della stabilità termica è stata completata con la valutazione della temperatura iniziale di decomposizione del copolimero preparato, mostrando una buona prestazione termica ma, nel frattempo, suggerendo cautela per quanto riguarda la percentuale di funzionalizzazione ponendo il limite oltre il quale un deterioramento delle proprietà fisiche dei copolimeri al 30% di gruppi acidi carbossilici pendenti è stato osservato.
Kinetic study of the thermal and thermo-oxidative degradations of aromatic poly(ether sulfone) random copolymers bearing pendant carboxyl groups
Samperi F;Scamporrino A;
2023
Abstract
A series of poly(ether sulfone) random copolymers at various loading of diphenolic acid (DPA) units were synthesized and subjected to a comprehensive kinetics degradation study to assess their thermal behaviour. Poly(ether sulfones) were synthesized from different amounts of 4,4?dihydroxydiphenylsulfone, DPA and stoichiometric quantity of 4,4?-dichlorodiphenyl sulfone by nucleophilic aromatic displacement. The apparent activation energy (E) of degradation for the prepared compounds was determined by using a kinetics literature method, discussed and compared with each other and with those obtained in the past for similar polymers. The comprehensive thermal stability evaluation was completed with the assessment of the initial decomposition temperature of the prepared copolymer, showing a good thermal performance but, in the meantime, suggesting caution as regards the percentage of functionalization setting the limit beyond which a deterioration of the physical properties of the copolymers at 30% of pendant carboxylic acid groups was observed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
