The shape memory effect in polymers

Белошенко, В. А.; Varyukhin, V. N.; Voznyak, Yurii V

doi:10.1070/rc2005v074n03abeh000876

Cited by 126 publications

(61 citation statements)

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“…); light (photo-responsive, without apparent temperature fluctuation); and, mechanical force (mechano-responsive, including impact and pressure) [2][3][4][5][8][9][10][11][12][13][14][15][16][17][18].…”

Section: Figurementioning

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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Section: Figurementioning

confidence: 99%

Mechanisms of the Shape Memory Effect in Polymeric Materials

et al. 2013

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“…Despite these hindrances SMPs are still advantageous over other shape memory materials due to the fact that they are low cost low density, and highly deformable among other benefits [24,25]. Shape memory materials are valued for their potential use in adaptive structures in applications such as micro air vehicles (MAVs) and morphing aircraft [26].…”

Section: Introductionmentioning

confidence: 99%

Unimorph Shape Memory Polymer Actuators Incorporating Transverse Curvature in the Substrate

Cantrell

Ifju

2014

Challenges in Mechanics of Time-Dependent Materials, Volume 2

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Shape memory polymers (SMP) utilized in reconfigurable structures have the potential to be used in a variety of settings. This paper is primarily concerned with the use of Veriflex-S shape memory polymer and bi-directional carbon fiber in a unimorph actuator configuration. One of the major deficiencies of SMP unimorphs is the permanent set (unrecovered shape) after a single or multiple temperature cycle(s). The novel concept of incorporating transverse curvature in the composite substrate, similar to that of an extendable tape measurer, was proposed to improve the shape recovery. A set of experiments was designed to investigate the influence of transverse curvature, the relative widths of SMP and composite substrates, and shape memory polymer thickness on actuator recoverability after multiple thermomechanical cycles. Flat carbon fiber and shape memory polymer unimorph actuators were evaluated for performance versus actuators of increasing transverse curvature. Digital image correlation was implemented to quantify the out-of-plane deflection of the unimorph composite actuators (UCAs) during the actuation cycle. Experimental results indicate that an actuator with transverse curvature significantly reduces the residual deformation while increasing the shape memory recoverability which could be further tailored to enhance the performance of shape memory polymers in reconfigurable arrangements.

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“…self-healing materials, 7 drugdelivery, [8][9] chemical separation, 10 sensors, 11 shape-memory materials [12][13] and (self-driven) actuators. [14][15] The spatial stability of gels in the presence of a variety of solvents is based on their crosslinked network structure.…”

Section: Polymeric Gels: From Macro To Micromentioning

confidence: 99%

“…1 H-(300 MHz) and 13 C-NMR (75 MHz) spectra were measured using a Bruker spectrometer. UV-vis measurements were performed using a Perkin Elmer Lambda 25 UV/VIS spectrometer.…”

Section: Instrumentationmentioning

confidence: 99%

Light-Sensitive Polymeric Nanoparticles Based on Photo-Cleavable Chromophores

Klinger

2013

Springer Theses

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This thesis focuses on the design, synthesis and characterization of novel photo-sensitive microgels and nanoparticles as potential materials for the loading and light-triggered release/accessibility of functional compounds. In order to realize this concept, different approaches to irradiation-dependent response mechanisms have been investigated.Novel light-cleavable divinyl functionalized monomeric crosslinkers based on o-nitrobenzyl derivatives were synthesized and used for the preparation of either PMMA or hydroxyl functionalized PHEMA microgels swellable and degradable in organic solvents. By the introduction of anionic MAA moieties into the PHEMA microgels, this concept was successfully transferred to double stimuli-responsive p(HEMA-co-MAA) hydrogel nanoparticles exhibiting a pH-dependent swelling and light-induced degradation behavior in aqueous media. This sensitivity to two orthogonal triggers is proposed to combine a pHinduced post-formation loading mechanism with a pH-and light-triggered release. In addition, a new class of enzyme-and light-sensitive PAAm microgels based on (meth-)acrylate functionalized dextrans as photo-and enzymatically degradable macromolecular crosslinkers was developed by introducing a photo-labile linker between the enzymatically degradable dextran chain and the polymerizable vinyl moieties. Here, the water solubility of the crosslinkers is assumed to enable an in situ loading approach of hydrophilic compounds.A different approach to the loading of microgels is based on photo-labile covalent microgel-drug conjugates. The first step to the realization of this concept was achieved by the development of a novel functional monomer consisting of a doxorubicin molecule covalently attached to a radically polymerizable methacrylate group via a photo-cleavable linker.Moreover, in order to enable the release of hydrophobic substances in aqueous media, hydrophobic nanoparticles consisting of a photo-resist polymer were designed to be degradable upon irradiation in water. Light-triggered conversion of the initial hydrophobic polymer into hydrophilic PMAA induced in situ particle dissolution and release of nile red.Since the introduction of a stimuli-responsive shell around a microgel is assumed to prevent leakage of embedded compounds, studies on non-stimuli-responsive shell formation around preformed microgel seed particles and the formation of microgel cores in polymeric shells were conducted to investigate potential synthetic pathways to this approach.In a last attempt, the surface of PHEMA and p(HEMA-co-MAA) microgels was functionalized with cinnamoyl groups in order to trigger the (reversible) particles interaction with each other by light-induced [2+2] cycloaddition reactions.

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The shape memory effect in polymers

Cited by 126 publications

References 1 publication

Mechanisms of the Shape Memory Effect in Polymeric Materials

Mechanisms of the Shape Memory Effect in Polymeric Materials

Unimorph Shape Memory Polymer Actuators Incorporating Transverse Curvature in the Substrate

Light-Sensitive Polymeric Nanoparticles Based on Photo-Cleavable Chromophores

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