Biobased covalent adaptable networks: towards better sustainability of thermosets

Green Chemistry, Journal Year: 2022, Volume and Issue: 24(11), P. 4363 - 4387

Published: Jan. 1, 2022

Thermosets have many advantages such as excellent mechanical properties, dimensional stability and environmental resistance, but suffer from unsustainability because they are difficult to recycle overdependent on petroleum chemicals.

Language: Английский

---

Dual-hard phase structures make mechanically tough and autonomous self-healable polyurethane elastomers

Chemical Engineering Journal, Journal Year: 2022, Volume and Issue: 454, P. 140268 - 140268

Published: Nov. 11, 2022

Language: Английский

---

Mechanically Robust Skin-like Poly(urethane-urea) Elastomers Cross-Linked with Hydrogen-Bond Arrays and Their Application as High-Performance Ultrastretchable Conductors

Macromolecules, Journal Year: 2022, Volume and Issue: 55(13), P. 5816 - 5825

Published: June 17, 2022

Elastomers play an irreplaceable role in industry and daily life; however, they are usually soft susceptible to damage. In this study, skin-like poly(urethane-urea) elastomers with high mechanical strength, stretchability, elasticity, excellent damage resistance, tolerance, healability fabricated by cross-linking polycaprolactone (PCL) chains hydrogen-bond arrays. The elastomer, which is denoted as PU-ASC, has a tensile strength of ∼72.6 MPa, recovery strain ∼500%, fracture energy ∼161 kJ m–2. Moreover, the PU-ASC elastomer exhibits unique strain-adaptive stiffening, endows capacity resist PU-ASC-IL conductors can be conveniently loading ionic liquids (ILs) into elastomers. healable, stretchable, elastic, damage-resistant, damage-tolerant show record-high performance, toughness, values ∼22.8 ∼164.2 MJ m–3, ∼73.6 m–2, respectively. resistance tolerance mainly originate from disintegrable arrays, capable dissipating energy, strain-induced crystallization PCL segments. Owing reversibility fractured healed under heating, restoring their original performance conductivity.

Language: Английский

---

Bio-Based, Self-Healing, Recyclable, Reconfigurable Multifunctional Polymers with Both One-Way and Two-Way Shape Memory Properties

ACS Applied Materials & Interfaces, Journal Year: 2023, Volume and Issue: 15(2), P. 3497 - 3506

Published: Jan. 4, 2023

Shape memory polymers (SMPs) have attracted wide attention over the past few decades due to their fantastic applications in modern life. Nevertheless, excellent self-healing properties, recyclability, solid-state plasticity, and reversible shape-switching ability are necessary but can rarely be satisfied one material. Herein, we report multifunctional SMPs by constructing a dynamic boronic ester bond cross-linking network using sustainable Eucommia ulmoides gum as raw Thanks crystallization melting temperature range, these kinds of thermal-triggered one-way shape performance show two-way whether under constant stress or stress-free conditions. Owing nature bond, it exhibits good properties (near 100% at 80 °C), reconfigurability, chemical recyclability. In addition, incorporating multiwalled carbon nanotubes, formed composite is responsive 808 nm near-infrared light. Its further exploited, including photoresponsive actuators, vascular stents, light-driven switches. This paper provides simple way for fabricating SMPs, as-prepared materials potential diverse fields, such biomedicine, intelligent sensing, soft robotics.

Language: Английский

---

Healable and Recyclable Polyurea‐Urethane Elastomer with High Mechanical Robustness, Superhigh Elastic Restorability, and Exceptional Crack Tolerance

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(22)

Published: Feb. 5, 2024

Abstract Developing the elastomer materials with high mechanical robustness through simple and environmentally friendly methods poses significant challenges. In this research, a solvent‐free polymerization method is reported to synthesize transparent polyurea‐urethane using polycaprolactone (PCL) as soft segment adjusting various hard segments. The target successfully combine acceptable performance exceptional crack tolerance, whereby notched samples can readily lift 25000 times (a rarely value) its weight. Moreover, superhigh elastic restorability allow recover original dimension from elongation over 5 or fracture. These results are attained due presence of densely uniformly distributed microdomains within elastomer, leading effective energy dissipation. Furthermore, owing linear structure molecular chains reversible hydrogen‐bonding interactions between chains, be conveniently healed recycled under heating conditions. This research provide general feasible strategy for construction comprehensive properties, elastomers expected applied in emerging fields such protective elements flexible electronics.

Language: Английский

---

Castor oil-derived sustainable poly(urethane urea) covalent adaptable networks with tunable mechanical properties and multiple recyclability based on reversible piperidine-urea bond

Chemical Engineering Journal, Journal Year: 2022, Volume and Issue: 446, P. 137071 - 137071

Published: May 23, 2022

Language: Английский

---

Highly Stretchable Fatty Acid Chain-Dangled Thermoplastic Polyurethane Elastomers Enabled by H-Bonds and Molecular Chain Entanglements

ACS Sustainable Chemistry & Engineering, Journal Year: 2022, Volume and Issue: 10(35), P. 11524 - 11532

Published: Aug. 15, 2022

Thermoplastic polyurethane (TPU) elastomers are widely used in daily products owing to their flexible structures and decent mechanical properties. Vegetable oils (VOs) promising renewable resources for polymer synthesis with readily availability abundant derivatives. However, most VO-based polyurethanes usually thermosets an unsatisfactory material performance because the C═C bonds randomly located on triglyceride long chains. Herein, a biobased TPU elastomer was facilely synthesized from palm oil (PO) desirable tunable PO-based diol PO via amidation 2-(2-hydroxyethylamino)ethanol. The resulting diethanolamide (POEA), combined butane-1,4-diol, further reacted 1,6-diisocyanatohexane prepare elastomers. containing H-bonds carbamates backbone dangling fatty acid side chains exhibited microphase separation structure, endowing superior stretchability (up strain of 831%), restorability, self-healing ability. morphological, melting, crystallization, rheological behaviors were fully studied. dynamic reversible three-dimensional cross-linked network consisting van der Waals forces investigated reveal formation mechanism

Language: Английский

---

Recent trends in thermo‐responsive elastomeric shape memory polymer nanocomposites

Polymer Composites, Journal Year: 2023, Volume and Issue: 44(8), P. 4433 - 4458

Published: June 30, 2023

Abstract Shape memory polymers (SMPs) are polymeric smart materials, a class of stimuli‐responsive that can return to their initial shape from programmed temporary under the application external stimuli, such as light, heat, magnetism, and electricity. Because these unique features, SMPs find applications in many fields, like aerospace, biomedical devices, flexible electronics, soft robotics, arrays, 4D printing. The comparatively low density, cost, easy biodegradability, biocompatibility make better candidate for applications. Among them, thermo‐responsive revert permanent depending on temperature greater than polymer transition temperature. Thermo‐responsive combine semi‐crystalline or elastomeric with improved mechanical electrical properties. Integrating nanofillers into elastomer matrices further enhance properties, forming shape‐memory nanocomposites (SMPNCs). This review focuses basics, design, classifications characteristics elastomers blends used. Incorporating various get SMPNCs have properties over is also presented. importance T g (glass temperature) m (melting based SMPNCs, used, methods preparation solution casting, melt compounding, situ polymerization, possible future discussed.

Language: Английский

---

High‐Performance, Light‐Stimulation Healable, and Closed‐Loop Recyclable Lignin‐Based Covalent Adaptable Networks

Small, Journal Year: 2023, Volume and Issue: 19(40)

Published: June 3, 2023

Abstract In this work, high‐performance, light‐stimulation healable, and closed‐loop recyclable covalent adaptable networks are successfully synthesized from natural lignin‐based polyurethane (LPU) Zn 2+ coordination structures (LPUxZy). Using an optimized LPU (LPU‐20 with a tensile strength of 28.4 ± 3.5 MPa) as the matrix for coordination, LPUs obtained that have different amounts Zn. When feed amount ZnCl 2 is 9 wt%, LPU‐20Z9 reaches 37.3 3.1 MPa toughness 175.4 4.6 MJ m −3 , which 1.7 times LPU‐20. addition, has crucial catalytic effect on “dissociation mechanism” in exchange reaction LPU. Moreover, ‐based bonds significantly enhance photothermal conversion capability lignin. The maximum surface temperature 118 °C under near‐infrared illumination 0.8 W −2 . This allows to self‐heal within 10 min. Due can be degraded recovered ethanol completely. Through investigation mechanisms design recycling method, work expected provide insight into development novel light‐stimulated heal ability, recyclability; applied toward expanded intelligent elastomers.

Language: Английский

---

Bio‐Based Thermosetting Resins: From Molecular Engineering to Intrinsically Multifunctional Customization

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(37)

Published: March 20, 2024

Recent years have witnessed a growing interest in bio-based thermosetting resins terms of environmental concerns and the desire for sustainable industrial practices. Beyond sustainability, utilizing structural diversity renewable feedstock to craft thermosets with customized functionalities is very worthy expectation. There exist many compounds inherently unique chemical structures functions, some which are even difficult synthesize artificially. Over past decade, great efforts devoted discovering/designing functional properties thermosets, notable progress been made antibacterial, antifouling, flame retardancy, serving as carbon precursors, stimuli responsiveness, among others, largely expanding their application potential future prospects. In this review, recent advances field presented, particular focus on molecular design strategies discovering properties. Examples highlighted wherein facilitated by inherent feedstock. Perspectives issues regarding further proposed at end.

Language: Английский

---