pH‐Induced Shape‐Memory Polymers

Han, Xiaobin; Dong, Zhenqiang; Fan, Ming‐Yu; Liu, Yan; Jian-hu, LI; Wang, Yi‐Fu; Yuan, Qijuan; Li, Bang‐Jing; Zhang, Sheng

doi:10.1002/marc.201200153

Cited by 270 publications

(168 citation statements)

References 24 publications

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“…When the hydrophobicity or size of the guest molecule is changed upon exposure to an external stimulus such as light, redox and pH, the complexes would show a reversible assembly-disassembly behavior. An example using the host-guest complex as the molecular switches was recently reported by Zhang and coworkers [131]. They synthesized crosslinked alginate networks containing both β-CD and diethylenetriamine (DETA) as the side groups (Fig.…”

Section: Page 21 Of 106mentioning

confidence: 97%

Recent progress in shape memory polymer: New behavior, enabling materials, and mechanistic understanding

Zhao

Xie

2015

Progress in Polymer Science

1,189

749

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Shape memory polymers (SMPs), as a class of programmable stimuliresponsive shape changing polymers, are attracting increasing attention from the standpoint of both fundamental research and technological innovations. Following a brief introduction of the conventional shape memory effect (SME), progress in new shape memory enabling mechanisms and triggering methods, variations of in shape memory forms (shape memory surfaces, hydrogels, and microparticles), new shape memory behavior (multi-SME and two-way-SME), and novel fabrication methods are reviewed. Progress in thermomechanical modeling of SMPs is also presented. Abbreviations:SCPs shape changing polymers; LCEs liquid crystalline elastomers; SMP shape memory polymer; SME shape memory effect; 2W two-way; 1W oneway; T trans transition temperature; T g glass transition temperature; T m melting temperature; T cl liquid crystal cleaning temperature; T d deformation temperature; T f shape fixing temperature; T c crystallization temperature; R f shape stability ratio; R r shape recovery ratio; T sw switching temperature; ε max maximum recoverable strain; σ max maximum recovery stress; SMC shape memory cycle; ε load strain under load; ε fixed strain; T r recovery Page 2 of 106 A c c e p t e d M a n u s c r i p t 2 temperature; ε rec recovered strain; V r strain recovery rate; T σmax temperature corresponding to σ max ; T sw,app apparent switching temperature; PCL poly(ε-caprolactone); SMPU shape memory polyurethane; EMU elemental memory unit; TME temperature memory effect; PU polyurethane; T i liquid-crystal isotropic transition temperature; T v vitrification temperature; CIE crystallization induced elongation; MIC melting induced contraction

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Section: Page 21 Of 106mentioning

confidence: 97%

Recent progress in shape memory polymer: New behavior, enabling materials, and mechanistic understanding

Zhao

Xie

2015

Progress in Polymer Science

1,189

749

View full text Add to dashboard Cite

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“…A diverse array of SMPs have been developed that recover their permanent shape in response to light [2], magnetic fields [3], electricity [4], moisture [5], or pH [6] for a variety of industrial, aeronautical, and biomedical applications and can be reviewed elsewhere [1, 7, 8]. In contrast to their shape memory alloy counterparts, SMPs can be created with diverse, multi-functional chemistries to enable drastic yet highly-controllable shape responses to various stimuli [9-12].…”

Section: Introductionmentioning

confidence: 99%

Pendant allyl crosslinking as a tunable shape memory actuator for vascular applications

et al. 2015

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Thermo-responsive shape memory polymers (SMPs) can be fit into small-bore incisions and recover their functional shape upon deployment in the body. This property is of significant interest for developing the next generation of minimally-invasive medical devices. To be used in such applications, SMPs should exhibit adequate mechanical strengths that minimize adverse compliance mismatch-induced host responses (e.g. thrombosis, hyperplasia), be biodegradable, and demonstrate switch-like shape recovery near body temperature with favorable biocompatibility. Combinatorial approaches are essential in optimizing SMP material properties for a particular application. In this study, a new class of thermo-responsive SMPs with pendant, photocrosslinkable allyl groups, x%poly( -caprolactone)-co-y%( -allyl carboxylate -caprolactone) (x%PCL-y%ACPCL), are created in a robust, facile manner with readily tunable material properties. Thermomechanical and shape memory properties can be drastically altered through subtle changes in allyl composition. Molecular weight and gel content can also be altered in this combinatorial format to fine-tune material properties. Materials exhibit high elastic, switch-like shape recovery near 37 °C. Endothelial compatibility is comparable to tissue culture polystyrene (TCPS) and 100%PCL in vitro and vascular compatibility is demonstrated in vivo in a murine model of hindlimb ischemia, indicating promising suitability for vascular applications.

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“…Liu 28 and Yang 29 utilized Zn 2+ –imidazole and Fe 3+ –phosphate coordination respectively to construct hydrogels with shape memory behavior. Zhang 31 and Harada 32 recently showed that host–guest complexes between dextrin and guest molecules such as adamantine and ferrocene can also be applied to fix temporary shapes. These pioneering works are tremendously useful to inspire the design of novel SMPs on the basis of supramolecular interactions.…”

Section: Introductionmentioning

confidence: 99%