Polímeros: Ciência e Tecnologia
https://app.periodikos.com.br/journal/polimeros/article/doi/10.1590/0104-1428.20250041
Polímeros: Ciência e Tecnologia
Original Article

Degradation of polychloroprene/natural rubber blend by photo-Fenton process. II-A solvent effect

Adonilson Reis Freitas; Luciana Gaffo; Edvani Curti Muniz

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Abstract

Polymeric degradation is an irreversible chemical process influenced by various physical and chemical agents. This study investigates the effects of different solvents on the degradation of a polychloroprene (PCP) and natural rubber (NR) blend in a toluene solution, catalyzed by FeCl3·6H2O. Efflux time was measured using an Ubbelohde viscometer to monitor the degradation process. The results demonstrate that the dielectric constant and dipole moment of solvents play a significant role in determining the rate and extent of polymer degradation. Kinetic analysis revealed that the degradation process does not adhere to a first-order model throughout the reaction period. However, it aligns with a first-order kinetic model during the initial phase (0-200 minutes). With a longer reaction time of 510 minutes, only THF and toluene solvents exhibited a linear relationship consistent with a second-order kinetic model. This study underscores the critical influence of solvent characteristics on controlling polymer degradation.

 

 

Keywords

polychloroprene, natural rubber, blend, degradation, solvent

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