Self‐Healing, High‐Strength, and Antimicrobial Polysiloxane Based on Amino Acid Hydrogen Bond

Abstract

Recent years have witnessed the rapid development of self-healing and recyclable materials because they can extend the life of the material. For polysiloxane materials, exploring polysiloxanes with high-strength and self-healing properties remains a challenge. In this work, a high-strength and self-healing polysiloxane containing N-acetyl-L-cysteine (NACL) side groups is prepared. The NACL is used to form strong hydrogen bonds to build a self-healing network. Molecular simulations help explain the reasons and processes for the repair of modified polysiloxanes. On the one hand, the obtained modified polysiloxanes have good self-healing properties. The self-healing efficiency of modified polysiloxane can reach 96.9%. As the number of NACL increases, the tensile strength of the modified polysiloxane increases. For PMVS-30%NACL, the tensile strength can reach 4.36 MPa, and the strain can reach 586%. On the other hand, modified polysiloxane has an apparent inhibitory effect on Staphylococcus aureus. With the increase in the number of NACL, the antibacterial effect of modified polysiloxane is more obvious. Furthermore, NACL is a bio-based amino acid with excellent biocompatibility. This work expands the idea of designing and synthesizing high-strength polysiloxanes with antibacterial properties. It has great potential in the field of polysiloxane antimicrobial coatings.

High-performance, fluorescent, UV-shielding, triboelectric, super-flexible polyurea elastomers via strong π–π stacking of pyrene and hydrogen bonding strategies

“…Meanwhile, the peak at 910 cm À1 assigned to the epoxide group appeared. The peaks in 1 H NMR and 13 C NMR spectra shown in Fig. S3(a) and (b) (ESI †) coincide with the structure of PrGE well, and the peak area ratios are consistent with theoretical ones.…”

“…Samples were obtained by the KBr tablet pressing method. 1 H nuclear magnetic resonance ( 1 H NMR) and 13 C nuclear magnetic resonance ( 13 C NMR) spectra were recorded on a Bruker DPX-400 spectrometer (400 MHz) to determine the chemical structure of epoxides dissolved in CDCl 3 . A Hitachi S-4700 scanning electron microscope (SEM) was used to observe the microstructure of the samples.…”

“…However, hydrogen bonding can also form intramolecularly, which reduces the mechanical properties of materials. 13 The coordination bond will be broken in the process of stretching, and the molecular chain will be severely deformed, while it also destroys the tensile strength of the material. 14 Therefore, the development of supramolecular networks needs to be explored continuously.…”

High-Performance, Degradable, Self-Healing Bio-Based Nanocomposite Coatings with Antibacterial and Antioxidant Properties

“…Therefore, in recent years, this kind of restoration method received widespread attention from researchers at home and abroad. Guo et al [ 20 ] prepared a high-strength self-healing polysiloxane containing N-acetyl-L-cysteine (NACL) side groups. The self-healing of the polysiloxane was realized by the hydrogen bond interaction of NACL.…”

Microstructure‐Driven Self‐Sorting of Chemically Indistinguishable Side Chains in Pre‐Programmed Alkyl Siloxanes Leading to Amplification of Mechanical Properties

“…However, Controlling supramolecular assembly in polysiloxanes is quite challenging due to their low glass transition temperatures [ Tg] (e.g., 146 K for polydimethylsiloxanes backbone) and extremely low rotational energy barrier around the Si─O─Si bonds (<0.2 kcal mol −1 ) in comparison to C─C bonds (3.6 kcal mol −1 ) in organic polymers. [24] The previous examples of self-assembled polysiloxanes in the literature were designed via incorporation of strongly interacting functional groups to exploit ionic bonding, [25,26] complementary H-bonding, [27][28][29][30] or 𝜋−𝜋 interactions. [31] Alkyl modification of polysiloxane, wherein van der Waal interactions among the alkyl chains are leveraged to reinforce the mechanical property of polysiloxanes in variety of applications, is a well-known approach in the silicones industry, [32][33][34][35][36][37][38] However, their strategic design to enable cooperativity among the van der Waals forces has not been fully explored.…”