A facile approach to modify poly(dimethylsiloxane) surfaces via visible light-induced grafting polymerization

Abstract

Tailoring the surface properties of poly(dimethylsiloxane) (PDMS) is essential for the advancement of its applications. However, the modification process is usually complicated and limited due to the chemical inertness of the surfaces of PDMS. Here, we report for the first time, a facile and versatile method for the functional surface modification of PDMS via visible light-induced grafting polymerization at room temperature. This modification is readily achieved in two steps: (1) covalently integrating alkyl bromine into the PDMS networks using a simple mixing procedure and (2) visible light-induced surface grafting polymerization using Mn 2 (CO) 10 . We have demonstrated that the PDMS surface can be functionalized with a wide variety of polymers via covalent grafting, such as poly(trifluoroethyl methacrylate) (PTFEMA), poly(N-isopropylacrylamide) (PNIPAAm), poly(acrylic acid) (PAA) and poly(vinyl acetate) (PVAc). As an example, after the grafted PVAc was transformed into its hydrophilic analogue poly(vinyl alcohol) (PVA), anti-biofouling functionalization of PDMS was obtained. The anti-biofouling properties of the functionalized PDMS were demonstrated using cell adhesion and bacterial adhesion tests. Moreover, the grafting kinetics of PVAc showed that this process was fast and efficient.

Bioinspired Blood Compatible Surface Having Combined Fibrinolytic and Vascular Endothelium‐Like Properties via a Sequential Coimmobilization Strategy

“…First, methacryloylisothiocyanate (MI) was coupled to PU surface to introduce vinyl groups, followed by grafting of a copolymer of HEMA and AdaMA (PHA) via surface‐initiated radical polymerization . The molecular weight (MW) of the grafted PHA on the PU surface was about 7.7 × 10 4 as determined by measuring the MW of free polymer formed simultaneously in solution, and the grafting density of PHA was about 4.0 mg cm −2 as measured by gravimetry . The PHA copolymer containing two pendant functional groups (OH from HEMA and Ada from AdaMA) then served as a spacer‐linker for incorporation of the REDV and Lys ligands to obtain hybrid surfaces referred to as PU‐REDV/Lys.…”

Macromolecular design and application using Mn2(CO)10‐based visible light photoinitiating systems

“…Due to its cell adhesion resistance and excellent biocompatibility, the functionalized surface displayed good anti-biofouling properties. 113 These authors also showed that a similar process can be applied for visible-light-induced grafting polymerization on Au surfaces (Scheme 22). Immobilizing an alkyl bromine layer through self-polymerization of the catechol-containing 2-bromo-N-(3,4-dihydroxyphenethyl)-2-methylpropanamide (BDAM) was the first step of the two-step process where visible-light-induced grafting polymerization of various monomers including acrylamide, N-isopropylacrylamide (NIPAAm), methacrylate, tBA, conjugated, St, and nonconjugated, N-vinylpyrrolidone (NPV), monomers appeared as the second.…”

Optical Temperature Sensors Based On Europium(III) Beta‐Diketonate Complexes Chemically Bonded To Functionalized Polydimethylsiloxane

“…The siloxane bond present in PDMS increases the flexibility of the PDMS polymeric chain compared to organic polymers, which resulting in flexible mechanical properties. Also, polydimethylsiloxane can be easily functionalized by several methods, such as polycondensation, UV and peroxide radical induced reactions and hydrosilylation . Among these processes, the hydrosilylation is an interesting homogenous catalyzed reaction free of byproducts between a Si−H and vinyl groups, and several molecules containing different chemical groups can be attached to the PDMS polymeric chain, in order to improve solubility or to covalently bond the temperature luminescent probe.…”