A self-healing and recyclable polyurethane-urea Diels–Alder adduct synthesized from carbon dioxide and furfuryl amine

Abstract

The fabrication of self-healing and recyclable CO2-based polymeric materials meets the requirement of sustainable development. By introducing reversible hydrogen bonds and heat-responsive Diels-Alder bonds, a new, environmentally friendly, self-healing and...

NIR Light Stimulated Self‐Healing Reduced Tungsten Oxide/Polyurethane Nanocomposite Based on the Diels−Alder Reaction

“…To prepare DAPU films, 75 g of DAPU solution at 30 wt% was poured into a 15 × 15 cm Teflon mold and dried at 60 °C for 48 h. [ 20,56–58 ] DAPU films of 0.8 mm thickness were obtained.…”

“…Then, 22.63 g of DAPU 2000 was added and mixed by using high torque mixer for 30 min followed by stirring by ball milling and then continuous stirring using a planetary mixer/de‐aerator. [ 12 ] The mixture was poured into a 15 × 15 cm Teflon mold and dried at 60 °C for 48 h. [ 20,56–58 ] The product obtained was designated as W‐DAPU (2000).…”

“…[ 15 ] A novel diamine DA adduct cross‐linker that can cure commercial oligomer to produce a recyclable and thermoplastic epoxy resin was also prepared. [ 16 ] Another group of researchers has also developed different types of DA polymers such as crosslinked polyacrylate, [ 17 ] UV‐curable reversible self‐healing DA poly(methacrylate), [ 18 ] PUDA/HMDI, [ 19 ] and PUUa‐DA, [ 20 ] and their finding shows that the developed DA adduct polymers possess outstanding self‐healing property. These findings all indicate that DA reaction is very important in the synthesis of self‐healing polyurethane materials.…”

Minireview on Self-Healing Polymers: Versatility, Application, and Prospects

“…Green chemistry is also practiced in the field of SHPs by developing green routes to synthesis and environmentfriendly SHPs. Using CO 2 as a nontoxic and furfuryl amine as a renewable feedstock, a green method to synthesize biobased nonisocyanate polyurethane-urea Diels-Alder adduct (PUUa-DA) was reported (Figure 10) [79]. The crosslinked PUUa-DA had tensile stress of 18.5 MPa, a modulus of 151 MPa, and a 136% elongation at break.…”

“…The crosslinked PUUa-DA had tensile stress of 18.5 MPa, a modulus of 151 MPa, and a 136% elongation at break. The self-healing response is provided by dynamic Diels-Alder bonds and H-bonds, which contribute to a 94 percent recovery in tensile strength after heating [79].…”