Cooling-/water-responsive shape memory hybrids

Wang, C.C.; Huang, Weiming; Ding, Zheng; Zhao, Yong; Purnawali, Hendra

doi:10.1016/j.compscitech.2012.03.027

Cited by 133 publications

(99 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the transition component should be able to soften upon cooling, which is not a commonly accessible feature in nature for us to utilize. So far, cooling-responsive SME has only been demonstrated by means of using tin (based on the phenomenon of tin disease) and poloxamer 407 (P407) as the transition component [5,11]. Figure 6I shows that P407 melts upon cooling to 4 °C and Figure 6II reveals the cooling-responsive SME in an elastic spong-P407 hybrid.…”

Section: Partial-transition Mechanism (Ptm) (Figure 5iii)mentioning

confidence: 99%

See 1 more Smart Citation

Mechanisms of the Shape Memory Effect in Polymeric Materials

et al. 2013

View full text Add to dashboard Cite

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.

show abstract

Section: Partial-transition Mechanism (Ptm) (Figure 5iii)mentioning

confidence: 99%

“…); 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

View full text Add to dashboard Cite

show abstract

“…Recent studies have shown that environmental conditions, such as the humidity, can substantially influence the conformational mobility of macromolecular chains and, thus, the shape memory properties of some polymers [2][3][4]. These findings motivated the development of the concept of a moisture-triggered shape memory effect.…”

Section: Introductionmentioning

confidence: 99%

Chitosan Membranes Exhibiting Shape Memory Capability by the Action of Controlled Hydration

2014

View full text Add to dashboard Cite

Abstract:Chitosan membranes can undergo a glass transition at room temperature triggered by hydration. The mechanical properties of the membranes were followed by a tension test and dynamic mechanical analysis (DMA), with the sample in wet conditions after being immersed in varying compositions of water/ethanol mixtures. Results show that with the increasing of water content, the Young's and storage modulus decrease systematically. For water contents of ca. 35 vol%, chitosan (CHT) exhibits a glass transition, showing an elastomeric plateau in the elastic modulus above this hydration level and the occurrence of a peak in the loss factor. Due to the semi-crystalline nature of CHT, membranes of this biomaterial present a shape memory capability induced by water uptake. By fixation of the permanent shape by further covalent cross-linking, the membranes can have different permanent shapes appropriate for different applications, including in the biomedical area.

show abstract

“…They have been widely applied as smart textiles and apparels [11], intelligent medical devices [12], heat shrinkable packages for electronics [13], high performance water-vapor permeability materials [14], self-deployable structures [15], and microsystems [16]. SMPs can recover their original (or permanent) shapes under appropriate external stimuli, such as heating [1,8,16,17], cooling [18], light [19,20], electric field [21][22][23][24][25][26], magnetic field [27][28][29], water [30], pH, specific ions or enzyme [31]. However, the demand to avoid external heaters has led to a new generation of electrically conducting SMPs filled with conductive nanoparticles, such as carbon nanotubes [21,22], carbon particles [23,26], conductive fiber [24] and nickel zinc ferrite ferromagnetic particles.…”

mentioning

confidence: 99%

Electrically conductive epoxy nanocomposites containing carbonaceous fillers and in-situ generated silver nanoparticles

Dorigato¹,

Giusti²,

Bondioli³

et al. 2013

Express Polym. Lett.

View full text Add to dashboard Cite

Abstract. An epoxy resin was nanomodified with in-situ generated silver nanoparticles (Ag) and with various amounts of carbon black (CB) and carbon nanofibers (NF), in order to increase the electrical conductivity of the matrix. Differential scanning calorimetry tests revealed how the addition of both CB and NF led to a slight decrease of the glass transition temperature of the material, while electron microscopy evidenced how the dimension of CB aggregates increased with the filler content. Both flexural modulus and stress at yield were decreased by CB addition, and the introduction of Ag nanoparticles promoted an interesting improvement of the flexural resistance. CB resulted to be more effective than NF in decreasing the electrical resistance of the materials down to 10 3 !·cm. Therefore, a rapid heating of the CB-filled samples upon voltage application was observed, while Ag nanoparticles allowed a stabilization of the temperature for elevated voltage application times.

show abstract

Cooling-/water-responsive shape memory hybrids

Cited by 133 publications

References 21 publications

Mechanisms of the Shape Memory Effect in Polymeric Materials

Mechanisms of the Shape Memory Effect in Polymeric Materials

Chitosan Membranes Exhibiting Shape Memory Capability by the Action of Controlled Hydration

Electrically conductive epoxy nanocomposites containing carbonaceous fillers and in-situ generated silver nanoparticles

Contact Info

Product

Resources

About