Journal Article10.1021/ACS.MACROMOL.6B00536
Reversible Bidirectional Shape Memory Effect in Polyurethanes through Molecular Flipping
TL;DR: In this article, reversible bidirectional shape memory is developed in thermoplastic polyurethane by designing different components to enable molecular switching from actuator domain to self-assembled rigid hard domain and vice versa under a temperature cycle.
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Abstract: Reversible bidirectional shape memory is developed in thermoplastic polyurethane by designing different components to enable molecular switching from actuator domain to self-assembled rigid hard domain and vice versa under a temperature cycle. Polycaprolactone based special polyurethanes have been synthesized which exhibit appropriate self-assembly behavior suitable for the shape memory effect. Reversible bidirectional shape memory has been reported through induced strain and giving shape at particular temperature, and the results are compared with conventional polyurethanes which do not show any shape memory effect. The correlation between chemical structures, self-assembly, structural evolution, and shape memory effect has been made. Self-gripping is demonstrated revealing the novel mechanism of molecular flipping and temperature-induced structural change along with molecular aggregation.
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Citations
Thermally-induced two-way shape memory polymers: Mechanisms, structures, and applications
TL;DR: Two-way shape memory polymers (2W-SMPs) as discussed by the authors are a class of shape-memory polymers with the reversible and programmable shape-changing behavior which have gained considerable attention compared to one-way SMPs.
270
Multiple and two-way reversible shape memory polymers: Design strategies and applications
TL;DR: In this paper, the authors present the concepts, the programming procedures, the molecular mechanism, classification, design strategies and the recent progress of thermally-induced shape memory polymers (SMPs), including dual, triple, multiple SMPs and two-way reversible SMP (2W-SMP) activated by direct and indirect heating method.
161
Two-way and multiple-way shape memory polymers for soft robotics: An overview
TL;DR: This review presents the recent progress of soft robots based on two-way and multiple-way thermo-responsive SMPs and discusses examples of real-world applications ofsoft robots and related actuators, challenges, and future directions.
156
Two-Way Reversible Shape Memory Polymers Made of Cross-Linked Cocrystallizable Random Copolymers with Tunable Actuation Temperatures
TL;DR: In this paper, random copolymers of e-caprolactone and ω-pentadecalactone were designed and made by ring-opening polymerization with Candida antarctica lipase B as catalyst.
109
Bioinspired Colloidal Photonic Composites: Fabrications and Emerging Applications
TL;DR: In this paper , a review of colloidal photonic composites (CPCs) is presented, focusing on the summary of building blocks, i.e., colloidal particles and polymeric matrices, and constructive strategies for designing CPCs with robust performance and specific functionality.
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References
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TL;DR: A very broad, additional spectrum of possible applications for intelligent polymers that covers an area from minimally invasive surgery, through high-performance textiles, up to self-repairing plastic components in every kind of transportation vehicles.
Polymersomes: tough vesicles made from diblock copolymers.
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TL;DR: The results suggest a new class of synthetic thin-shelled capsules based on block copolymer chemistry, and both the membrane bending and area expansion moduli of electroformed polymersomes (polymer-based liposomes) fell within the range of lipid membrane measurements.
2.5K
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2K
Micellization of block copolymers
TL;DR: A general overview of the preparation, characterization and theories of block copolymer micellar systems is presented in this paper, with examples of micelle formation in aqueous and organic medium are given for di-and triblock copolymers, as well as for more complex architectures.
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