Caractérisation de réactions primaires de dégradation oxydante au cours de l'autoxydation des poly(oxyéthylène)s à 25°C: Étude en solution aqueuse avec amorçage par radiolyse du solvant, 8. Étude cinétique en fonction du ph compris entre 1 et 13

Abstract

L'emploi de l'amorçage radiochimique a montré que des coupures de chaîne dues à des réactions primaires de dégradation oxydante se produisent au cours de l'autoxydation à 25°C du poly(oxyéthylène) en solution aqueuse. Le changement de 1 à 13 de la valeur du pH des solutions irradiées n'entraîne pas de modification du schéma réactionnel proposé pour rendre compte des résultats obtenus en milieu de pH naturel. Jusqu'à pH 10, la vitesse d'amorcage varie comme le rendement radiochimique GHO. de la radiolyse de l'eau. Au‐delà, cette vitesse diminue jusqu'à devenir nulle vers pH 13.

Chemical Modification of Reactive Multilayered Films Fabricated from Poly(2-alkenyl azlactone)s: Design of Surfaces that Prevent or Promote Mammalian Cell Adhesion and Bacterial Biofilm Growth

“…Numerous past studies demonstrate that SAMs decorated with poly(ethylene glycol) or oligo(ethylene glycol) functionality can prevent the adsorption of proteins and the adhesion of cells 18,20,21. However, the performance of these and other related materials has been reported to erode over time, possibly arising from the susceptibility of oligo- and poly(ethylene glycol) to auto-oxidation and/or hydrolytic degradation 22,57,58. We note that a recent study from our group demonstrated that the treatment of topographically patterned bulk films of azlactone-containing polymers with amine-terminated poly(ethylene glycol) could be used to pattern regions that prevent the initial attachment and proliferation of cells 59.…”

Improved Antifouling Properties of Polydimethylsiloxane Films via Formation of Polysiloxane/Polyzwitterion Interpenetrating Networks

“…Modification of PDMS with polyethyleneglycol (PEG) has been found to be a convenient way to increase hydrophilicity, while maintaining the electrically neutral character and biocompatibility of the material . However, relatively poor chemical stability of PEG in the presence of oxygen and transition metal ions, or through enzymatic processes, has incited further interest into more stable, nonfouling and biocompatible materials . In recent years the modification of hydrophobic PDMS using zwitterionic polymers has emerged as a promising method, which increases hydrophilicity of the material and imparts fouling resistant properties .…”

Amine end-functionalized poly(2-ethyl-2-oxazoline) as promising coating material for antifouling applications

“…Antifouling properties of immobilized PEG-and POx-based coatings have been widely reported in the literature. 8,[14][15][16][17][18][19][20] Due to the different, more real life test conditions, e.g. attack of multiple bacteria and synthetic river water medium, a comparison of the obtained results to other POx or PEG coatings, reported in literature, is difficult.…”

“…8,[15][16][17][18] However, PEG is known to undergo degradation by (auto-)oxidation to form ethers and aldehydes, hampering its long-term application. 13,[19][20][21][22] On this account, poly(2-oxazoline)s (POx), in particular the water soluble poly(2-methyl-2-oxazoline) s (PMeOx) and poly(2-ethyl-2-oxazoline)s (PEtOx), are investigated as alternative coating materials. 13,19,[23][24][25][26][27][28][29][30][31] Compared to the synthesis of PEG by anionic polymerization, the preparation of POx by cationic ring-opening polymerization (CROP) is less labor demanding, but also yields well-dened polymers with controlled molar masses and low polydispersity index (PDI) values.…”