Abstract The research for self‐healing epoxy vitrimers has attracted a lot of attention over the years. However, due to special structure molecular chain, which limits its movement ability, usually need be healed under high temperature and pressure. So it is relatively difficult healing. Here, new type cross‐linked network obtained by cross‐linking hydrogenated bisphenol A resin polypropylene glycol diglycidyl ether (PPGDGE) as hard soft segments with an amine curing agent containing...

Abstract Thermoset epoxy resin materials can be endowed with unique dynamic properties by introducing covalent bonds (DCB) into the cross‐link network of resin. However, it remains a challenge to obtain high mechanical, thermodynamic, and properties. In this work, series vitrimers double DCBs were prepared using curing agent imine (PAMD) an disulfide (BGPDS). PAMD BGPDS are cross‐linked form uniform aromatic framework that ensures mechanical thermal material. High‐density ensure performance...

ABSTRACT Although some studies have reported high‐toughness or high‐strength self‐healing materials, the process still requires demanding conditions such as high temperatures. It remains challenging to achieve a balance between mechanical properties and efficiency under mild conditions. Herein, we design novel polyurea‐urethane (PUU) material. The polymer has crosslinked internal “cores” well‐designed flexible chains with multiple alicyclic structures, which are via tetrahedral...

Abstract Vitrimers are polymers rich in dynamic covalent bonds cross-link networks. When the not activated, vitrimers show performance stability of traditional thermosetting polymer. can some novel and unique properties, such as stress relaxation, self-healing reprocessing. This new type polymer has attracted wide attention because its properties. As thermoset materials, degree density materials very important for vitrimers. In order to find out effects on properties vitrimers, a series...

The synthesis of polymeric materials that simultaneously possess multiple outstanding mechanical properties and self-healability is always a great challenge. Herein, we report the robust self-healing polyurea material, which contains dual metal coordination structure Zn(II)-urea Zn(II)-diamidepyridine as well dense hydrogen bonds. Due to synergistic enhancement dynamic bonds in supramolecular network, obtained combination excellent high-efficiency properties, are adjustable by varying...

Abstract Epoxy-based shape memory materials still face many challenges from preparation to application. Designing dynamic covalent bonds into the cross-linked network of epoxy can bring new properties them, which is expected solve some problems faced. In this paper, vitrimers with different contents exchangeable disulfide were synthesized by polymerization hydrogenated resins diacids containing bonds. The effect bond content on was systematically studied. By activating exchange reaction...

Abstract High‐performance polyurea materials demonstrate promising applications in the field of aerospace, military, etc. During processing and use, however, formation cracks may cause serious degradation material properties. Self‐healing should be an effective way to address this issue. Here, innovative material, which exhibited excellent mechanical properties self‐healing abilities, was synthesized from commercially available poly(propylene glycol) bis(2‐aminopropyl ether), isophorone...

Giant magnetostrictive actuator (GMA) may be a promising candidate to drive an electronic controlled injector as giant material (GMM) has excellent performances large output, fast response and high operating stability etc. To meet the driving requirement of injector, GMA should produce maximal shortening displacement when energized. An unbiased with 'T' shaped output rod is designed reach target. Furthermore, open-hold-fall type voltage exerted on coil accelerate speed current. The modeled...

Developing polymers with high self-healing rates as well robust mechanical properties remains a significant challenge. Herein, series of novel polyurethane-urea (PUU) elastomers strength and toughness were prepared using 4,4′-diaminodicyclohexyl methane (HMDA) N,N′-ditert-butylethylenediamine (DBDA). The HMDA amino groups react the alicyclic isocyanates to form strong hard segments composed multiple structures urea hydrogen bonds. play crucial role in generating strain-induced...

In this paper, the electrostatic performance of graphene coating samples is comprehensively evaluated and tested, focusing on resistance (volume surface resistance) dissipation characteristics coating, differences coatings with different addition are investigated; The changes properties were studied by simulating vacuum, alternating high low temperature, UV-vis other environments. It found that content has a significant effection samples. higher graphene, lower shorter decay time; Vacuum,...

Abstract C 16 H 18 O 8 Zn, monoclinic, I 2/ a (no. 15), = 12.152(2) Å, b 5.0051(8) c 27.273(5) β 101.536(7)°, V 1625.3(5) Å 3 , Z 4, R gt ( F ) 0.052, w ref 2 0.143, T 296 K.