Synergistic Effect on Corrosion Resistance of Phynox Substrates Grafted with Surface-Initiated ATRP (Co)polymerization of 2-Methacryloyloxyethyl Phosphorylcholine (MPC) and 2-Hydroxyethyl Methacrylate (HEMA)

Abstract

Phynox is of high interest for biomedical applications due to its biocompatibility and corrosion resistance. However, some Phynox applications require specific surface properties. These can be imparted with suitable surface functionalizations of its oxide layer. The present work investigates the surface-initiated atom transfer radical polymerization (ATRP) of 2-methacryloyoxyethyl phosphorylcholine (MPC), 2-hydroxyethyl methacrylate (HEMA), and ATRP copolymerization of (HEMA-co-MPC) (block and statistic copolymerization with different molar ratios) on grafted Phynox substrates modified with 11-(2-bromoisobutyrate)-undecyl-1-phosphonic acid (BUPA) as initiator. It is found that ATRP (co)polymerization of these monomers is feasible and forms hydrophilic layers, while improving the corrosion resistance of the system.

Nitinol Modified by In Situ Generated Diazonium from Its Nitro Precursor for the SI-ATRP of 2-Hydroxyethyl Methacrylate

“…This behavior (increasing hydrophobicity followed by increasing hydrophilicity) confirms the electrografting of PD-Br and the polymerization of HEMA and is in lined with previously reported results. 98 The LSV curves analysis ( Figure 15) shows for NiTi|PD-Br|PHEMA a cathodic shift of the corrosion potential (Table II) and a strong decrease of the recorded corrosion current density. The NiTi|PD-Br|PHEMA presents a mixed inhibition with a corrosion behavior improved compared to bare NiTi.…”

Immobilization of laccase onto modified PU/RC nanofiber via atom transfer radical polymerization method and application in removal of bisphenol A

“…Atom transfer radical polymerization (ATRP) was adopted in this research, in order to introduce more active sites on the surface of nanofiber membrane, so as to increase the amount of enzyme per unit weight . ATRP was discovered in 1995 in conjunction with that Sawamoto and Matyjaszewski exploited the redox chemistry of ruthenium and copper complexes , respectively, and rapidly become one of the most versatile reversible deactivation radical polymerization methods due to the simple experimental setup, broad range of monomers and solvent used, commercial availability of initiators (alkyl halides) and catalyst components , and also recognizes opportunities for further modification by easy attachment of initiators to surfaces or biological molecules . The ATRP method has often been adopted for making linear polymer chains/brushes with controlled molecular lengths/weights since the propagation centers do not undergo chain termination and/or chain transfer during polymerization , and thus the molecular weights/lengths increase linearly with the conversion of monomers , and the monomers involved in ATRP are very various , for example, styrene , acrylonitrile , acrylate , acrylamide , and so on.…”

Electrografting of mixed organophosphonic monolayers for SI-ATRP of 2-methacryloyloxyethyl phosphorylcholine

“…One way to generate theses polymers is the surface-initiated controlled radical polymerization (SI-ATRP) which leads to the growth of polymer brushes with a good level of control over chain length, grafting density, and molecular architecture. 39,[45][46][47] ATRP mechanism is based on the reversible catalyzed homolytic rupture of the alkyl-halogen bond of the initiating group (e.g., bromoisobutyrate). The relative weakness of the C-Br bond (E b = 318.0 ± 8.4 kJ mol À1 ), 48 unstable in certain surface treatment conditions such as induction heating, 49 decreases the efficiency of SI-ATRP.…”

“…The use of mixed monolayers resulting from the co-adsorption of two organophosphonic acid derivatives differing in length and/or terminal functional groups has been reported to improve the corrosion resistance as well as the layer organization. 47,[52][53][54] Among the promising and versatile surface characterization techniques, scanning electrochemical microscopy (SECM), based on the use of an ultramicroelectrode facing a substrate, allows the local probing of its electrochemical property, i.e., its conducting/ insulating behavior, and can provide high-resolution information on the electrochemical processes occurring at the surface. [55][56][57][58] Over the last years, SECM has been widely applied for the study of self-assembled monolayer properties and impact over corrosion resistance 26,[59][60][61] and on organic layer permeability.…”