Self-healing Polyurethane Elastomer Based on Molecular Design: Combination of Reversible Hydrogen Bonds and High Segment Mobility

Combing experimental methods and molecular simulations to study self-healing behaviors of polyurethane elastomers containing multiple hydrogen bond networks and flexible blocks

“…28 Then, the PU containing PPG-600 blocks ( PU-600 ) was synthesized according to the previous report of our group, and the detailed synthesis steps can be seen in the Section 2.2.2. 16 Finally, the UPy-NCO was linked on both the ends of the PU-600 chains, and the final product was named as the PU-UPy (the synthesis steps could be seen in the Section 2.2.3). Besides, the corresponding reaction mechanisms of the synthesis of the PU-600 and the PU-UPy are shown in Scheme 1.…”

“…6 In our previous work, on the basis of summarizing the corresponding findings of other groups and also the related findings of our group, we proposed a simple but useful idea for the design of the self-healing elastomers: the combination of reversible hydrogen bonds and segments with high mobility. 16 That is, after introducing flexible polymer blocks (polypropylene glycol (PPG) blocks) with strong segmental mobility at the ends of the PU chains, even the conventional PU can exhibit improved self-healing ability. 16 In this former work, we did not change the hydrogen bond network in the PU, and the corresponding hydrogen bonds mainly form between urethane carbonyl groups or carbonyl groups in polycarbonate glycol ( PCDL ) segments and urethane NH groups.…”

CO2-derived non-isocyanate polyurethanes (NIPUs) and their potential applications

“…In a few examples, they have been used to the self-healing extent in PU elastomer 93 and to control host-guest interactions between cyclodextrin and adamantane in thermoplastic PU prepared from hexamethylene diisocyanate and tetraethylene glycol polymer hydrogel of poly(N-isopropylacrylamide). [93][94][95] Hydrogen bonds control has also been coupled with the already discussed Diels-Alder, where multi-arm UV-cured PU, N,N′(4,4′-methylenediphenyl)bismaleimide, and furfuryl alcohol have been reacted. 96 Polymeric materials can also recover their properties through physical interactions.…”

Synthesis and properties of responsive self-healing polyurethane containing dynamic disulfide bonds

“…The hard segment domains formed between adjacent hard segments based on intermolecular hydrogen bonds can play a role in enhancing polyurethane. 24 PCL1k-SS@COOH shows better tensile strength than PCL2k-SS@COOH and PCL530-SS@COOH. As shown in Figure 5(c), it also confirms the higher hydrogen bond content inside PCL1k-SS@COOH from the side.…”