Temperature‐Sensitive Amorphous Polyurethanes

Park, Se Hong; Kim, Jin Woo; Lee, Sung Ho; Kim, Byung Kyu

doi:10.1081/mb-120029780

Cited by 13 publications

(2 citation statements)

References 10 publications

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“…Upon increasing the LC segment length and decreasing the TU segment content from S1 to S5,t he a-relaxation transition shifts to lower temperatures,a nd the magnitude of E' at the rubbery plateau region decreases consistently.T his decrease in temperature and rubbery modulus arises from the decreasing concentration of TU segment domains,w hich act as physical cross-links. [50] Theo nset of the melting transition of crystalline TU segment domains,w here the material enters the viscoelastic flow region, is revealed by the temperature at which ad istinct increase in tan d and ad ecrease in E' are observed. When increasing the temperature further, the…”

Section: Resultsmentioning

confidence: 99%

One‐Pot Synthesis of Melt‐Processable Supramolecular Soft Actuators

2021

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The application of reprocessable and reprogrammable soft actuators is limited by the synthetic strategies, 3D‐shaping capabilities, and small deformations. In this work, melt‐processable supramolecular soft actuators based on segmented copolymers containing thiourethane and liquid crystal segments have been prepared via sequential thiol addition reactions in a one‐pot approach using commercially available building blocks. The actuators demonstrated immediate, reversible response and weightlifting capabilities with large deformations up to 32 %. Through exploiting the supramolecular cross‐links, the material could be recycled and reprogrammed into 3D actuators and welded into an actuator assembly with different deformation modes. Our work offers a one‐pot synthesis and straightforward melt‐processable approach to prepare supramolecular soft actuators with large deformations that can be reprocessed and reprogrammed into arbitrary 3D shapes.

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Section: Resultsmentioning

confidence: 99%

One‐Pot Synthesis of Melt‐Processable Supramolecular Soft Actuators

2021

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“…So far, the most extensively investigated SMPs are thermally induced, where the switching domains are directly destroyed by external heating to release the constraints on the oriented polymer network. [5][6][7] Incorporation of conductive fillers, such as carbon black or carbon nanotubes (CNTs), in SMPs enables the shape recovery through application of an electric filed. [8][9][10][11] It arises from the inductive Joule heating generated by the conductive fillers under the electric field and becomes significant with decreasing of the resistivity for a given voltage.…”

Section: Introductionmentioning

confidence: 99%

Electroactive Shape-Memory Ternary Composite Based on Bi-Component Biodegradable Polyester

Na¹,

Pan²,

Lv³

et al. 2012

Journal of Macromolecular Science, Part B

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Shape-memory polymers (SMPs) are stimuli-responsive materials whose shape recovery is usually stimulated by directly heating above the switching temperature. However, combination of SMPs with conductive fillers enables shape recovery by applying a voltage instead of using external heating, which may permit fabrication of smart electroactive actuators. Herein, we demonstrate that, by controlling drawing temperature and related morphology, rapid electroactive shape recovery has been realized in a ternary composite consisting of multiwalled carbon nanotubes (MWCNTs) and two biodegradable polyesters, a property that was not available in composites using only one of the polyesters.

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One‐Pot Synthesis of Melt‐Processable Supramolecular Soft Actuators

2021

View full text Add to dashboard Cite

The application of reprocessable and reprogrammable soft actuators is limited by the synthetic strategies,3 Dshaping capabilities,a nd small deformations.I nt his work, melt-processable supramolecular soft actuators based on segmented copolymers containing thiourethane and liquid crystal segments have been prepared via sequential thiol addition reactions in ao ne-pot approach using commercially available building blocks.T he actuators demonstrated immediate,r eversible response and weightlifting capabilities with large deformations up to 32 %. Through exploiting the supramolecular cross-links,t he material could be recycled and reprogrammed into 3D actuators and welded into an actuator assembly with different deformation modes.Our work offers ao ne-pot synthesis and straightforwardm elt-processable approach to prepare supramolecular soft actuators with large deformations that can be reprocessed and reprogrammed into arbitrary 3D shapes.

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Temperature‐Sensitive Amorphous Polyurethanes

Cited by 13 publications

References 10 publications

One‐Pot Synthesis of Melt‐Processable Supramolecular Soft Actuators

One‐Pot Synthesis of Melt‐Processable Supramolecular Soft Actuators

Electroactive Shape-Memory Ternary Composite Based on Bi-Component Biodegradable Polyester

One‐Pot Synthesis of Melt‐Processable Supramolecular Soft Actuators

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