Engineered self-healable elastomer with giant strength and toughness via phase regulation and mechano-responsive self-reinforcing

Transparent, flame‐retarded, self‐healable, mechanically strong polyurethane elastomers: Enabled by the synthesis of phosphorus/nitrogen‐containing oxime chain‐extender

“…The temperature was ranged from À80 to 60 C at a rate of 5 C/ min. Thermogravimetry-Fourier transform infrared spectra (TG-IR) analysis of samples was performed using a TG-DSC (METTLER TOLEDO, Switzerland) equipped with a FT-IR spectrometer (Thermo Fisher Scientific) with a heating rate of 20 C/min under 13 C-NMR, and (c) 31 PSK2 was synthesized by simple procedure with cheap and readily available chemical raw materials, and its chemical structure was confirmed by 1 H-NMR, 13 C-NMR, 31 P-NMR, and FT-IR shown in Figures 1 and 2, respectively. The 1 H-NMR, 13 C-NMR, and 31 P-NMR spectra of PSK2 was showed as follows: 1 (P-O).…”

“…In the FTIR spectrum of PSK2 (Figure 2), the characteristic peaks at 3317 cm À1 belongs to -OH, the characteristic peaks at 1707 cm À1 belongs to C=N, the characteristic peaks at 1505 cm À1 belongs to N=C-H, the characteristic peaks at 1268 cm À1 belongs to P=O, the characteristic peaks at 948 cm À1 belongs to P-O. 1 H-NMR, 13 C-NMR, 31 and FT-IR results demonstrated PSK2 was synthesized successfully.…”

“…Herein, we design and synthesize a simultaneous mechanically strong, flame-retarded, transparent, and efficient self-heal ability of PU elastomer, enabled by the synthesis of phosphorus/ nitrogen-containing oxime chain extender (PSK2). The PSK2 (Scheme 1) was obtained by using cheap industrial reagents phosphorus oxychloride as starting materials, and reacted with p-hydroxybenzaldehyde and hydroxylamine hydrochloride to form oxime, it can offer the phosphorus with flame retardant effect and oxime ester bond with self-healable effect, [31][32] furthermore, the addition of PSK2 obviously affects the phase structure of PU. Based on this, we introduce the PSK2 into traditional PU elastomers to synthetize distinctive materials.…”

Reversible hetero-Diels–Alder amine hardener as drop-in replacement for healable epoxy coatings

“…Concomitantly, cross-linked polymeric networks containing dynamic covalent bonds, viz. disulfide bonds, 31 thermally cleavable alkoxyamines, 32,33 ester linkages, 34,35 dioxaborolanes, 36 oximes linkages, 37,38 and Diels-Alder (DA) bonds, 39,40 have emerged as a promising path to extend the life cycle of polymeric materials. 41 DA reactions excel thanks to their simplicity, 100% atom economy, repeatability, and thermal tunability.…”

Healable and reprocessable silica/poly(oxime‐urethane) composite elastomer with high mechanical robustness and exceptional damage‐tolerant capacity

“…The resulted material exhibited good reprocessability with the repair efficiency of more than 90%. Liu et al 34 designed a new polyurethane elastomer with significant thermally responsive self-healing properties, and the dynamic exchange of oxime-urethane bonds and hydrogen bonds created sufficient chain mobility to give the elastomer excellent heal efficiency (tensile strength, elongation and toughness recovery of 95.7%, 99.8% and 96.7%).…”