Triple-shape memory effect of covalently crosslinked polyalkenamer based semicrystalline polymer blends

Cuevas, José María; Rubio, R. A.; Germán, Lorena; Laza, José Manuel; Vilas, José Luis; Rodrı́guez, M.; León, L. M.

doi:10.1039/c2sm07481h

Cited by 73 publications

(60 citation statements)

References 16 publications

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“…Also, heterogeneous blends of polyethylenes (PEs) and thermodynamically incompatible trans-polyoctenamer (TOR) with suitable compositions cross-linked via high energy electrons (HEE) show pronounced triple-shape behavior with high performance and even weakly pronounced quadruple-shape behavior after simple OSP process [13]. Similarly, the pronounced triple-shape behavior in bending mode was described independently from us in the same year by Cuevas et al [14] in blend of TOR and linear medium polyethylene (20 wt% TOR/ 20 wt% PE) cross-linked by 1-3 wt% dicumyl peroxide. Note that initially the binary uncross-linked meltmiscible [2,8] and melt-immiscible polymer blends [15] were used in order to obtain SM polymeric materials with relatively stable physical network.…”

Section: One-way Sme In Polymeric Materialsmentioning

confidence: 78%

Shape-memory behavior of cross-linked semi-crystalline polymers and their blends

Kolesov¹,

Dolynchuk²,

Radusch

2015

Express Polym. Lett.

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The aim of present mini-review is an attempt to perform the comparative description and analysis of results of our experimental investigation and of physically justified modeling of unconstrained one-way shape-memory effect (SME) and invertible twoway SME under load in crystallizable covalent polymer networks. Besides the dual SME in cross-linked homopolymers, the one-and two-way multi-shape behavior in heterogeneous networks on the basis of binary and ternary blends will be discussed. The special focus in present work is directed on the key role of phase morphology of cross-linked polymer blends varied by blend composition on the performances of multiple SM behavior. Brief overview of various types of SME in polymeric materialsIn the last decades the SME in polymeric materials was the research object of hundreds of original papers and many reviews (see for instance [1][2][3][4][5][6][7][8]). There are four main types of stimuli, which are able to trigger a shape change of polymeric materials: temperature variation, chemical reactions, light, and mechanical forces [2][3][4][5][6][7]. Correspondingly, among polymeric materials the thermo-, chemo-, photo-, and mechano-responsive material groups can be classified. In majority of publications, which consider SM behavior of polymer systems, the subject of investigation are thermo-responsive polymeric materials. According to the existence of ordered Abstract. The present study deals with thermally induced one-way and invertible two-way shape-memory effect (SME) in covalent networks on the basis of crystallizable (co)polymers and their blends and is an attempt to generalize the results of own investigation received by the authors in the last ten years. The main focus of work clearly lies on research of covalently crosslinked binary and ternary blends having two and three crystalline phases with different thermal stability, respectively. The existence of two or three crystalline phases possessing different melting and crystallization temperatures in heterogeneous polymer networks can lead to triple-shape or even quadruple-shape behavior of such networks. However, the performed investigations point to crucial effect of phase morphology of crosslinked polymer blends on multiplicity of their shapememory behavior beside the influence of blend content, crystallinity and cross-link density of blend phases as well as of processing conditions. For instance, triple-shape memory behavior in binary blends can be realized only if the continuous phase has a lower melting temperature than the dispersed phase. Cross-linked polymer blends are a facile alternative to expensive and complex synthesis of interpenetrating or block-copolymer networks used for shape memory polymers. In addition to findings of experimental investigation of SME in crystallizable covalent polymer networks, the results of modeling their shape-memory behavior on the basis of self-developed physically reasonable model have been briefly described and discussed. Thereby, good accordance between results of theory and ...

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Section: One-way Sme In Polymeric Materialsmentioning

confidence: 78%

Shape-memory behavior of cross-linked semi-crystalline polymers and their blends

Kolesov¹,

Dolynchuk²,

Radusch

2015

Express Polym. Lett.

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“…c n from the tradition triple shape memory generally reported. 20,38,39 Here, we developed a new method to synthesize a triple shape memory system with an easy and controllable method. In this system, there is a wide temperature difference between the soft segment in the polyurethane and the photocross-linked structure from polyurethane hard segment, in which the T m of PCL-diols and the T g of the crosslinking structure of the hard segment can act as the two transition temperatures of the triple shape memory polyurethane.…”

Section: ■ Experiments and Methodsmentioning

confidence: 99%

Design of Triple-Shape Memory Polyurethane with Photo-cross-linking of Cinnamon Groups

Wang

Yang

Chen

et al. 2013

ACS Appl. Mater. Interfaces

105

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A triple-shape memory polyurethane (TSMPU) with poly(ε-caprolactone) -diols (PCL-diols) as the soft segments and diphenyl methane diisocyanate (MDI), N,N-bis (2-hydroxyethyl) cinnamamide (BHECA) as the hard segments was synthesized via simple photo-crosslinking of cinnamon groups irradiated under λ > 280 nm ultraviolet (UV) light. Fourier transform infrared spectroscopy (FT-IR), proton nuclear magnetic resonance ( 1 H-NMR) and ultraviolet-visible absorption spectrum (UV−vis) confirmed the chemical structure of the material. Differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) results demonstrated that the photocrosslinked polymer possessed two transition temperatures, one is due to the melting point of the soft segment PCL-diols, and the other is due to the glass transition temperature. All these contributed to the cross-linked structure of the hard segments and resulted in an excellent triple-shape memory effect. Alamar blue assay showed that the material has good non-cytotoxicity and can be potentially used in biomaterial devices.

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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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Triple-shape memory effect of covalently crosslinked polyalkenamer based semicrystalline polymer blends

Cited by 73 publications

References 16 publications

Shape-memory behavior of cross-linked semi-crystalline polymers and their blends

Shape-memory behavior of cross-linked semi-crystalline polymers and their blends

Design of Triple-Shape Memory Polyurethane with Photo-cross-linking of Cinnamon Groups

Mechanisms of the Shape Memory Effect in Polymeric Materials

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