Metal- and Peroxide-Free Silicone Rubbers with Antibacterial Properties Obtained at Room Temperature

Abstract

Metal-and peroxide-free silicone rubbers were obtained via a reaction between amino-containing poly-(dimethylsiloxanes) (amino-terminated (APDMS-1) or a copolymer with pendant amino groups (APDMS-2)) and iodinecontaining polysiloxanes (PIMSs) (Menshutkin reaction). Simple mixing of functional polymers at room temperature resulted in forming silicone materials. The formation of ammonium cross-links was confirmed using solid-state 1 H and 13 C NMR spectroscopy. The equimolar ratio of NH 2 groups to the I-containing moiety (1:1) was the most optimal among other ratios (2:1 and 1:2) to carry out cross-linking and led to the highest cross-linking density according to the swelling measurements. PIMS/APDMS-1 (1:1) rubbers had the lowest average molecular weight of segments between cross-links M c = 250 compared to PIMSs/APDMS-1 (1:2) and (2:1) with M c = 1110 and 390, respectively. The obtained silicone rubbers showed antibacterial activity against Escherichia coli and Staphylococcus aureus and thereby could be applied in biomedicine and the food industry as antibacterial coatings and materials.

Self-Healing Silicone Materials: Looking Back and Moving Forward

“…In general, silicone rubbers with SH ability have broad applications in nanotechnology, optoelectronics, biomedicine, soft robotics and human activity [ 11 , 13 , 14 , 15 , 16 , 17 ]. Various protective coatings with a long service life [ 9 , 26 , 27 , 53 , 54 , 110 , 120 , 125 , 139 , 144 , 145 ], electromagnetic shielding films [ 57 , 99 ], triboelectric nanogenerators [ 126 , 130 ], sensors and skin-inspired electronics [ 49 , 101 , 118 , 124 , 127 , 129 , 131 , 134 , 136 , 141 , 143 , 144 , 146 , 147 , 148 , 149 ], actuators and artificial muscles [ 8 , 44 , 66 , 107 , 118 , 126 , 147 , 148 , 150 ], separating membranes [ 151 ], liquid crystals [ 152 ], and flexible and stretchable luminescent and electroluminescent devices […”

“…SHSMs create more potential to increase the service life and reliability of protective coatings. Thus, SH silicone rubbers based on the covalent and non-covalent reversible interactions (imine, disulfide, boroxine, carbamate, hydrogen, ionic and coordination bonds) were utilized to prepare various types of protection coatings, including anticorrosion films [ 53 , 54 , 110 , 120 , 125 , 139 , 144 ], antifouling and antimicrobial coatings [ 20 , 100 , 104 , 106 , 120 , 145 ], insulators [ 44 , 60 , 154 ], films with SH ability after electrical breakdown [ 7 , 8 , 9 , 60 , 61 , 108 ], anti-icing [ 121 ], and superhydrophobic coatings [ 26 , 52 , 119 , 155 ]. Thus, there are no specific formulas related to protective coatings, as the composition and properties of the coating will vary depending on the specific application.…”

“…Ongoing research [ 20 , 104 , 106 , 145 ] focuses on fabrication antibiofouling layers, which can coat and protect substrates from the growth of organisms such as bacteria, mold, mildew, or algae on substrates (e.g., marine structures). Thus, Sun J. et al [ 104 ] fabricated a novel silicone-based poly(urea-thiourea)/tannic acid composite with excellent mechanical ( σ = 2.47 MPa and high stretchability of 1000%), SH and antifouling properties.…”

Multi‐dimensional stimulus response organic silicone polymer elastomer and its application

“…One of the transparent elastomers were organosilicon rubbers, which has excellent moisture-proof, waterproof and other characteristics. 31 The organosilicon polymers showed high elastic deformation after molecular chain cross-linking. 32 At room temperature, it can deform under the action of external force, and the scale change was time-dependent.…”

“…One of the transparent elastomers were organosilicon rubbers, which has excellent moisture‐proof, waterproof and other characteristics 31 . The organosilicon polymers showed high elastic deformation after molecular chain cross‐linking 32 .…”