Mutifunctional Electrospun Nonwoven Mats with Two‐Way Shape Memory Behavior Prepared from Sol–Gel Crosslinked Poly(ε‐Caprolactone)

Pandini, Stefano; Agnelli, Silvia; Merlettini, Andrea; Chiellini, Emo; Gualandi, Chiara; Paderni, Katia; Focarete, Maria Letizia; Messori, Massimo; Toselli, Maurizio

doi:10.1002/mame.201600519

Cited by 22 publications

(27 citation statements)

References 46 publications

(107 reference statements)

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“…The stretched mats show an effective increase in stiffness only from applied strain of 50% and an overall change in the initial modulus from about 20 MPa (undeformed mat; εappl = 25%) to 45 MPa (εappl = 185%). The ability to sustain cell adhesion, first investigated by seeding balb/3T3 clone A31 mouse embryo fibroblasts on the undeformed mat, revealed a lack of cytotoxicity, allowing to consider these systems as potential scaffolds for tissue engineering [6]. To investigate the possibility to control cellular alignment, biological tests were carried out on both randomly oriented and highly aligned mats, seeding them with iPSCs-derived NSCs.…”

Section: Resultsmentioning

confidence: 99%

Shape memory electrospun nonwovens based on crosslinked poly(ε-caprolactone) for multifunctional biological applications

Inverardi

Ginestra

Ferraro

et al. 2018

AIP Conference Proceedings

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In this work we have explored the capabilities of an electrospun mat, realized in crosslinked poly(εcaprolactone), to be employed as a scaffold for specific biological applications. Its shape memory behavior was here exploited to easily control fiber orientation and to guide cellular alignment. Randomly oriented mats were transformed in a stable shape with various degrees of fiber alignment by simply varying the maximum strain applied throughout proper thermo-mechanical cycles. The effect of fiber alignment was investigated both on mechanical properties and on cell culture, through biological characterization done by using Neural Stem Cells derived from human iPSCs (induced Pluripotent Stem Cells). Further, thanks to the thermal stability of the microfibrous structure, it was possible to transfer, through inkjet printing on the electrospun, a biocompatible sensing element, which successfully allowed to monitor cell adhesion (L6 Myoblast) in an innovative way under dynamic conditions.

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Section: Resultsmentioning

confidence: 99%

Shape memory electrospun nonwovens based on crosslinked poly(ε-caprolactone) for multifunctional biological applications

Inverardi

Ginestra

Ferraro

et al. 2018

AIP Conference Proceedings

Self Cite

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“…Several pioneering works have contributed to production of materials with two‐way shape memory behavior, including laminated composites, [ 28–32 ] liquid crystal elastomers, [ 33,34 ] and crosslinked crystalline polymers. [ 35–49 ] Laminated polymer composites comprising two layers bonded with an adhesive agent are limited by the weak interlayer strength and cyclicity. Furthermore, the complicated synthesis of liquid crystal elastomers is still challenge, which limits their mass production.…”

Section: Introductionmentioning

confidence: 99%

“…[ 41 ] In addition, they recently reported nonwoven fibrous mats based on semicrystalline networks prepared from crosslinked PCL (cPCL) by combining electrospinning and sol–gel reactions and investigated the two‐way shape memory behavior. [ 42 ] Xie and co‐workers [ 43 ] and Qian et al [ 44 ] both used semicrystalline PEVA crosslinked by DCP to synthesize a two‐way shape memory polymer. The findings of Xie's group showed how crosslinking affects the 2W‐SME in different ways to the 1W‐SME.…”

Section: Introductionmentioning

confidence: 99%

Two‐Way Reversible Shape Memory Properties of Benzoyl Peroxide Crosslinked Poly(ethylene‐co‐vinyl acetate) under Different Stress Conditions

Jin

Xia

et al. 2020

Macro Materials & Eng

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wide range of applications, including as actuators [17] and sensors, [18] and in aerospace technology, [19] textiles, [20] and biomedical applications. [21,22] The types of the shape memory effect (SME) include the one-way shape memory effect (1W-SME), two-way shape memory effect (2W-SME) and multishape memory effect (multi-SME). One-way shape memory polymers only remember their shape at high temperature, and programming once leads to only one shape memory cycle, which limits their application as actuators and for artificial intelligence. Multishape memory polymers [23,24] also show the 1W-SME. Two-way shape memory polymers [25][26][27] exhibit the complete reversibility in heating and cooling that is required for many applications. Several pioneering works have contributed to production of materials with two-way shape memory behavior, including laminated composites, [28][29][30][31][32] liquid crystal elastomers, [33,34] and crosslinked crystalline polymers. [35][36][37][38][39][40][41][42][43][44][45][46][47][48][49] Laminated polymer composites comprising two layers bonded with an adhesive agent are limited by the weak interlayer strength and cyclicity. Furthermore, the complicated synthesis of liquid crystal elastomers is still challenge, which limits their mass production.The thermal crosslinking reaction using a crosslinking agent to crosslink semicrystalline polymers has attracted much attention because of the good two-way shape memory reversibility, low cost, and simple synthesis process. Mather's group reported Two-way (reversible) chemically crosslinked semicrystalline shape memory polymers are synthesized using poly(ethylene-co-vinyl acetate) (PEVA) with benzoyl peroxide (BPO). The two-way shape memory effect (2W-SME) is achieved under both constant stress and stress-free conditions. It is found that the stress-free 2W-SME can be achieved by the relationship between the initial prestretching strain (R prestretch ) and recovery strain (R rec ). Under the same prestretching stress, the stress-free two-way shape memory behavior can be controlled by variation of R rec using a different setting temperature (T set ) in the recovery process. More importantly, the driving force and recovery force, as one of the key indicators for two-way shape memory materials, are investigated, and they significantly change depending on the BPO content. The sample with high BPO content shows excellent high-temperature creep resistant performance. A highly crosslinked structure can suppress viscous flow and provides sufficient force to allow the sample to recover its initial shape after crystal melting. Therefore, the PEVA/BPO samples are able to contract during heating. The presence of an oriented crystal structure with high applied stress that causes sample elongation during cooling is also investigated. These findings for PEVA/BPO two-way shape memory polymers will contribute to their applications as soft actuators in various fields.The ORCID identification number(s) for the author(s) of this article can be found under http...

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“…However, most typical SMPs just show 1W-SME, which is not reversible, because the external stimulus activates only changes from a temporary to a permanent shape. Recently, a few two-way SMPs based on chemical crosslinked semicrystalline polymers have been reported, such as poly (cyclooctene) (PCO) [25], polyurethane (PU) [23,26], poly (ethylene-co-vinyl acetate) (PEVA) [27], and poly (ε-caprolactone) (PCL) [28,29]. A large amount of work has been done on the shape memory natural rubbers obtained through strain induced crystallization by Tiller [30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Facile fabrication of foamed natural Eucommia ulmoides gum composites with heat‐triggered shape memory behavior

2018

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Shape memory polymers (SMPs) are a type of smart material with potential application in aerospace engineering, biomedical devices, and sensors. In this article, we propose a new technique for the preparation of foamed Eucommia ulmoides gum (EUG) composites, which have excellent one‐way and two‐way shape memory performances. The advantages of these foamed composites are not only light weight but also good shape memory performance. For their remarkably light weight, large deformation, and efficient cost, these composites are expected to be a kind of popular smart materials in the future. We studied the properties of foamed composites via mechanical measurements, swelling experiments, thermal analysis and shape memory analysis, hoping to establish the relationship between the microstructure and macroscopic properties of composites. The results showed that the composites with 0.4 phr sulfur had superior one‐way shape memory properties and moderate mechanical properties. In the two‐way shape memory tests, the composites performed excellent two‐way shape memory properties with the applied stress ranging from 200 to 350 KPa. POLYM. COMPOS., 40:3075–3083, 2019. © 2018 Society of Plastics Engineers

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Mutifunctional Electrospun Nonwoven Mats with Two‐Way Shape Memory Behavior Prepared from Sol–Gel Crosslinked Poly(ε‐Caprolactone)

Cited by 22 publications

References 46 publications

Shape memory electrospun nonwovens based on crosslinked poly(ε-caprolactone) for multifunctional biological applications

Shape memory electrospun nonwovens based on crosslinked poly(ε-caprolactone) for multifunctional biological applications

Two‐Way Reversible Shape Memory Properties of Benzoyl Peroxide Crosslinked Poly(ethylene‐co‐vinyl acetate) under Different Stress Conditions

Facile fabrication of foamed natural Eucommia ulmoides gum composites with heat‐triggered shape memory behavior

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