Thermally activated reversible shape switch of polymer particles

Gong, Tao; Zhao, Kun; Wang, Wenxi; Chen, Hongmei; Wang, Lin; Zhou, Shaobing

doi:10.1039/c4tb01155d

Cited by 90 publications

(73 citation statements)

References 57 publications

(66 reference statements)

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“…In multiphase co‐polyester urethane networks capable of a rSME, poly( ε ‐caprolactone) segments are responsible for actuation and poly( ω ‐pentadecalactone) forms the skeleton . Polymer networks prepared from six‐armed poly(ethylene glycol)‐poly( ε ‐caprolactone) precursors have been applied to fabricate particles that can reversibly change their shape upon cyclic heating and cooling . Ellipsoidal temporary shaped particles were obtained by embedding the spherical particles in a modified polyvinyl alcohol film and stretching of the film at 60°C and subsequent fixation at 0°C .…”

Section: Introductionmentioning

confidence: 99%

“…Polymer networks prepared from six‐armed poly(ethylene glycol)‐poly( ε ‐caprolactone) precursors have been applied to fabricate particles that can reversibly change their shape upon cyclic heating and cooling . Ellipsoidal temporary shaped particles were obtained by embedding the spherical particles in a modified polyvinyl alcohol film and stretching of the film at 60°C and subsequent fixation at 0°C . Free‐standing rSME have been reported for covalently crosslinked poly[ethylene‐ co ‐(vinyl acetate)] (cPEVA) as well as for a copolymer network, named cPCLBA, containing crystallizable PCL and amorphous poly( n ‐butylacrylate) segments .…”

Section: Introductionmentioning

confidence: 99%

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Reversible shape‐memory properties of surface functionalizable, crystallizable crosslinked terpolymers

Farhan

Chaganti

Nöchel

et al. 2015

Polymers for Advanced Techs

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There is a high demand for polymer actuators comprising reactive groups at their surface in biotechnological or bioanalytical devices especially in microfluidics. In this work, we explored whether a thermoplastic poly[ethyleneco-(ethyl acylate)-co-(maleic anhydride)] (PEEAMA) terpolymer can be converted to a multifunctional shapememory actuator by introducing covalent netpoints. In crosslinked PEEAMA (cPEEAMA) crystalline polyethylene (PE) domains with melting temperatures below 70°C should serve as actuation domains, responsible for the reversible shape change during cyclic heating and cooling, while higher melting PE crystals act as skeleton forming domains; finally maleic anhydride (MAH) groups enable surface modification of the polymeric substrate. cPEEAMAs with a fixed composition and various crosslink densities were prepared by thermally crosslinking of PEEAMA using different dicumyl peroxide (DCP) concentrations in the starting reaction mixture. A broad melting transition in the range of 50 to 90°C with a melting temperature interval of ΔT m = 40°C, related to the crystalline PE domains, was observed for all polymer networks in differential scanning calorimetric experiments. Cyclic, thermomechanical uniaxial tensile tests revealed high reversible strains up to 17 ± 2%. A reversible change in long period during repetitive heating and cooling was observed in in situ small angle X-ray scattering experiments. Finally, a successful functionalization of the MAH groups at the cPEEAMA surface by reaction with ethylene diamine was confirmed by infrared spectroscopy analysis. The presented amino functionalized cPEEAMA substrates could be a candidate material for the preparation of adaptive microfluidic devices.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reversible shape‐memory properties of surface functionalizable, crystallizable crosslinked terpolymers

Farhan

Chaganti

Nöchel

et al. 2015

Polymers for Advanced Techs

View full text Add to dashboard Cite

show abstract

“…In this study the authors suggested that it would be possible to either promote or deter phagocytosis in future studies employing iterations of these particles. [31] Temperature-responsive composites-based on polycaprolactone and poly(sebacic anhydride), have been shown to be capable of delivering paracetamol (5 wt% loading) by passive diffusion while maintaining their SMP properties, [32] and ultrasound-responsive SMP-based drug delivery devices have been developed for the delivery of copper sulfate (formerly used as an emetic and antimalarial), [31] or a high molecular weight model drug (lysozyme), [33] which may find application in the emerging area of ultrasound-mediated drug delivery systems. [34] Lendlein and co-workers have made some interesting contributions to the literature with temperature-responsive degradable caprolactone-based polymers for the delivery of hydrophilic drugs (such as ethacridine lactate) and hydrophobic drugs (e.g., enoxacin).…”

Section: Smp-based Materials With Speculative Application As Drug Delmentioning

confidence: 97%

Responsive Biomaterials: Advances in Materials Based on Shape‐Memory Polymers

et al. 2016

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Shape-memory polymers (SMPs) are morphologically responsive materials with potential for a variety of biomedical applications, particularly as devices for minimally invasive surgery and the delivery of therapeutics and cells for tissue engineering. A brief introduction to SMPs is followed by a discussion of the current progress toward the development of SMP-based biomaterials for clinically relevant biomedical applications.

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“…(c)] reversible shape memory (RSM) transformations . This new class of materials significantly extends the range of practical applications for programmable shape‐shifting …”

Section: Introductionmentioning

confidence: 99%

Reversible shape‐shifting in polymeric materials

Zhou

Sheiko

2016

J Polym Sci B Polym Phys

122

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In recent years, significant progress has been made in polymeric materials, which alter shape upon external stimuli, suggesting potential applications in robotics, biomedical engineering, and optical devices. These stimuli-responsive materials may be categorized into two classes: (i) shapechanging materials in which a specific type of shape-shifting is encoded in the original material structure and (ii) shapememory materials, which do not possess any predetermined shape-shifting as prepared, yet allow programming of complex shape transformations on demand. While shape alterations in shape-changing materials are intrinsically reversible, shape memory is usually a one-way transformation from a metastable (programmed) to an equilibrium (original) state. Recently, different principles for both one-way reversible and two-way reversible shape memory have been developed. These offer a powerful combination of reversibility and programmability, which significantly expands the range of potential applications. The goal of this review is to highlight recent developments in reversible shape-shifting by introducing novel mechanisms, materials, and applications.

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Thermally activated reversible shape switch of polymer particles

Abstract: Shape-switchable micrometer-sized particles have the ability to reversibly switch their shapes between 43 and 0 °C via a two-way shape memory effect.

Cited by 90 publications

References 57 publications

Reversible shape‐memory properties of surface functionalizable, crystallizable crosslinked terpolymers

Reversible shape‐memory properties of surface functionalizable, crystallizable crosslinked terpolymers

Responsive Biomaterials: Advances in Materials Based on Shape‐Memory Polymers

Reversible shape‐shifting in polymeric materials

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