Triple shape memory effect in multiple crystalline polyurethanes

Chen, Heng; Hu, Jinlian; Yuen, Chun-wah Marcus; Chan, Laikuen; Zhuo, Haitao

doi:10.1002/pat.1523

Cited by 143 publications

(34 citation statements)

References 18 publications

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“…Fig. Additionally, the sample DMAPS20 is also found to show excellent triple-SME, 69,70 (Fig. This shape memory behaviour is generally called dual-SME since the shape is changed from one temporary shape to the permanent shape.…”

Section: Thermally-induced Smementioning

confidence: 92%

Development of zwitterionic copolymers with multi-shape memory effects and moisture-sensitive shape memory effects

Chen

Stadler

et al. 2015

J. Mater. Chem. B

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Shape memory polymers (SMP) and zwitterionic polymers both have great applications in biomedical fields. This works successfully combines functionalities of zwitterionic polymers and SMP, developing new kind of zwitterionic copolymers having a multi-shape memory effect (SME) and a moisture-sensitive SME. The results demonstrate that a series of zwitterionic multi-SMPs, coded as p(DMAPS-co-AA), were synthesized from DMAPS and acrylic acid (AA). A micro-phase separated structure is formed in the resulting p(DMAPS-co-AA). The strong hydrogen bonding between AA segments serves as a reversible switch, while the strong electrostatic forces among DMAPS segments serve as physical crosslinkers. Therefore, shape memory testing demonstrates that p(DMAPS-co-AA) shows not only dual-SME, but also triple-SME and quadruple-sSME. Moreover, in addition to the thermally-induced SME, p(DMAPS-co-AA) also shows moisture-sensitive SME. It is thus proposed that this zwitterionic multi-SMP could find great potential applications in smart biomedical fields. Fig. 8 Thermally-induced multi-SMEs of DMAPS-co-AA copolymers (A) repeated dual-SME; (B) triple-SME; (C) quadruple-SME; (D) sequential shape recovery; (E) a group of photos showing the sequential fixed at 110 1C; 90 1C and 70 1C; recovered at 90 1C and 110 1C.Fig. 9 Moisture absorption curves (A) and moisture-sensitive strain recovery curves (B) of DMAPS-co-AA copolymer with different DMAPS contents at 80% RH and T = 30 1C; (C) the moisture-sensitive shape recovery process of sample DMAPS50 at 80% RH and T = 30 1C ((a) 0 min; (b) 10 min; (c) 20 min; (d) 30 min; (e) 40 min; (f) 50 min; (g) 60 min; (h) 70 min; (i) 80 min). Journal of Materials Chemistry B Paper

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Section: Thermally-induced Smementioning

confidence: 92%

Development of zwitterionic copolymers with multi-shape memory effects and moisture-sensitive shape memory effects

Chen

Stadler

et al. 2015

J. Mater. Chem. B

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“…Following these concepts, the triple-SME has been realized in a number of polymer systems [54,[110][111][112][113][114][115][116][117]. Although in theory, we can achieve an infinite number of intermediate shapes [109,118], the significance of the SME in each intermediate shape is reduced with the increase of the number of the intermediate shapes.…”

Section: Multiple-sme (Shape Memory Effect)mentioning

confidence: 99%

Mechanisms of the Shape Memory Effect in Polymeric Materials

et al. 2013

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Abstract:This review paper summarizes the recent research progress in the underlying mechanisms behind the shape memory effect (SME) and some newly discovered shape memory phenomena in polymeric materials. It is revealed that most polymeric materials, if not all, intrinsically have the thermo/chemo-responsive SME. It is demonstrated that a good understanding of the fundamentals behind various types of shape memory phenomena in polymeric materials is not only useful in design/synthesis of new polymeric shape memory materials (SMMs) with tailored performance, but also helpful in optimization of the existing ones, and thus remarkably widens the application field of polymeric SMMs.

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“…The triple shape memory behavior of crystalline polyurethane was observed by Hu et al [44]. Also, polyalkenemer and polyolefin-based polymer blends were used by Cuevas et al in order to develop triple shape memory polymers which were two semicrystalline polymers (poly(cyclooctene) (PCO) and polyethylene (PE)) [42].…”

Section: One-way (Dual) Shape Memory Effect (1w-sme)mentioning

confidence: 95%

Smart Delivery Systems with Shape Memory and Self-Folding Polymers

Erkeçoğlu¹,

Sezer²,

Bucak³

2016

Smart Drug Delivery System

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New generation delivery systems involve smart materials such as shape memory and self-folding polymers. Shape memory polymers revert back to their original shape above their glass transition temperatures where this temperature change can be induced conventionally, photolytically, with a lazer or magnetically depending on the composition of the material. This ability to assume original shape upon a trigger can be used in delivering drugs, DNA or cells. Self folding polymers are a new class of materials which may be composed of multilayers with different thermal expansion coefficients or with hinges that allow folding upon being triggered. These new materials allow various architectural designs of smart delivery vehicles predominantly for DNA and cells. The aim of this chapter is given shape and folding polymers and their usage for drug delivery systems.

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Triple shape memory effect in multiple crystalline polyurethanes

Cited by 143 publications

References 18 publications

Development of zwitterionic copolymers with multi-shape memory effects and moisture-sensitive shape memory effects

Development of zwitterionic copolymers with multi-shape memory effects and moisture-sensitive shape memory effects

Mechanisms of the Shape Memory Effect in Polymeric Materials

Smart Delivery Systems with Shape Memory and Self-Folding Polymers

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