Stress‐Free Two‐Way Shape Memory Polymers with Dual‐Crystalline Phase Based on Poly(Tetramethylene Ether Glycol) and Poly(ε‐Caprolactone)

Macromolecular Rapid Communications, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 6, 2025

Two-way shape memory polymers (2W-SMPs) are a class of smart materials and can undergo spontaneously reversible deformation after specific stimuli. It is crucial to develop 2W-SMPs achieve precise control two-way behavior without external forces reveal their structure-property relationships. In this study, dual-crystalline phase crosslinked polymer networks based on poly(tetramethylene ether glycol) (PTMEG) poly(ε-caprolactone) (PCL) fabricated via thiol-ene click reactions. The with two independent melting temperatures gained by adjusting the ratio segments enabled using temperature difference between phases. effects network composition, pre-tensile strain, actuation properties investigated mechanism further elucidated. Among various compositions networks, PTMEG8-PCL2 exhibits optimal properties, strain 24.25% up 10.35% at pre-stretch 45 °C 15%, respectively, which potential for soft robotics applications. believed that work guides design semicrystalline properties.

Language: Английский

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Tough, High-Strength and Recyclability Polyurethane Elastomers Via Woven Crosslinking Strategy

Published: Jan. 1, 2025

Language: Английский

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Smart Polymeric Composite Thermal Switch for Geothermal Energy Harvesting

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: March 20, 2025

Geothermal energy represents a promising sustainable power source that harnesses Earth's natural heat through water circulation systems. A critical challenge in geothermal generation is controlling the heating process formation of cracks hot zones. This requires an innovative thermal switch or reversible proppant can regulate flow and ensure optimal absorption before extraction for electricity generation. In this study, we designed synthesized composite with polymeric artificial muscle embedded fluoroelastomer matrix. design, protects from superhot (200 °C above) damage also provides tensile stress to muscle; desired actuation. poly(vinylidene fluoride-co-bexafluoropropylene) (PVDF-HFP) was cross-linked by dicumyl peroxide (DCP) form PVDF-HFP/DCP. Nylon fiber twisted until it used coil as muscle. Under zero external loading, exhibited maximum contraction upon (CUH) about 10.76% expansion cooling (EUC) 10.89% when temperature cycled 25 200 °C. Furthermore, CUH EUC were 2.12 3.36%, respectively, 150 The still excellent actuation chemical stability after soaking within pressure vessel 4 weeks. design-oriented structural mechanics model developed evaluate various design parameters on smart switch. To further highlight performance PVDF-HFP/DCP, prepared three other fluorinated rubbers controls. shows promise valve enhanced systems, offering potential improve efficiency controlled fracture conductivity.

Language: Английский

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Ultra-Stretchable, Tough, and Self-Healing Polyurethane with Tunable Microphase Separation for Flexible Wearable Electronics

Nano Energy, Journal Year: 2025, Volume and Issue: unknown, P. 110908 - 110908

Published: March 1, 2025

Language: Английский

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Development of epoxy resin-based two-way responsive actuator and its application in thermal stimulation soft robot

Colloids and Surfaces A Physicochemical and Engineering Aspects, Journal Year: 2025, Volume and Issue: unknown, P. 136758 - 136758

Published: March 1, 2025

Language: Английский

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Enhanced Tunable Stress-Free Reversible Shape-Memory Effect in a Cross-Linked Cocrystallizable Polymer Blend

Macromolecules, Journal Year: 2024, Volume and Issue: 57(15), P. 7347 - 7359

Published: Aug. 5, 2024

Semicrystalline polymers are promising candidates for preparing reversible or two-way shape-memory polymer (SMP) networks. However, there is a lack of facile and effective strategies improving tuning the stress-free effect (rSME) in semicrystalline This paper reported such strategy based on melt-blending cross-linking cocrystallizable polymers. Specifically, we constructed several blended networks by poly(ethylene–propylene–diene monomer) (EPDM) linear low-density polyethylene (LLDPE). The show an ultrabroad melting transition ranging from −25 to 120 °C demonstrate significantly enhanced tunable rSME compared EPDM LLDPE It revealed that can be physically cross-linked small amount due cocrystallization. cocrystals work as dynamic cross-linkages help fix orientation enhance crystallization-induced elongation chains, which main reason rSME. provides way tailoring both chain mobility networks, opening up new opportunities designing developing high-performance SMPs.

Language: Английский

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Mimosa‐Inspired Body Temperature‐Responsive Shape Memory Polymer Networks: High Energy Densities and Multi‐Recyclability

Advanced Science, Journal Year: 2024, Volume and Issue: 11(39)

Published: Aug. 14, 2024

Abstract Inspired by the Mimosa plant, this study herein develops a unique dynamic shape memory polymer (SMP) network capable of transitioning from hard to pliable with heat, featuring reversible actuation, self‐healing, recyclability, and degradability. This material is adept at simulating functionalities artificial muscles for variety tasks, remarkable specific energy density 1.8 J g −1 —≈46 times higher than that human skeletal muscle. As an intelligent manipulator, it demonstrates proficiency in identifying handling items high temperatures. Its suitable rate recovery around body temperature indicates its promising utility as implant addressing acute obstructions. The covalent bonding within structure not only provides excellent resistance solvents but also bestows abilities reprocessing, degradation. These attributes significantly boost practicality environmental sustainability. Anticipated promote advancements sectors biomedical devices, soft robotics, smart actuators, SMP represents forward leap muscles, marking stride toward future adaptive sustainable technology.

Language: Английский

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High-performance shape-memory-polymer (SMP) composites via optimization of multidimensional graphitic-carbon fillers and development of heat-fire-and-smoke alarm devices using SMP composites

Advanced Composites and Hybrid Materials, Journal Year: 2024, Volume and Issue: 7(6)

Published: Oct. 24, 2024

Language: Английский

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High-strength fluorosilicone rubber with exceptional shape memory performance obtained through stereochemical structure regulation

Polymer Chemistry, Journal Year: 2024, Volume and Issue: 15(33), P. 3406 - 3415

Published: Jan. 1, 2024

The strain-induced crystallization effect arising from high stereochemical structural regularity leads to FSR exhibiting exceptional tensile strength.

Language: Английский

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Ag-S coordination strategy for high recovery driving stress in recyclable shape memory polymers

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: unknown, P. 156309 - 156309

Published: Sept. 1, 2024

Language: Английский

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