Mechanisms of the multi-shape memory effect and temperature memory effect in shape memory polymers

Sun, Li; Huang, Wei

doi:10.1039/c0sm00236d

Cited by 235 publications

(173 citation statements)

References 18 publications

(30 reference statements)

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“…In 2010, Dr. Xie demonstrated that a polymer with a broad transition temperature range can be programmed to have more than one intermediate shape [108]. Subsequently, the underlying mechanism was revealed [109]. It was proved that the multiple-SME is an intrinsic feature of polymers and that the triple-SME can be easily achieved in most polymers by programming based on only one transition [19].…”

Section: Multiple-sme (Shape Memory Effect)mentioning

confidence: 99%

“…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%

“…Figure 17 presents the experimental results of the TME in an EVA-based melting glue and paraffin wax. It is clear that the TME is another intrinsic feature of polymers [109], but there are many factors which may affect the TME. Among others, the exact shape of the DSC curve (e.g., single peak or multiple peaks in transition), the coefficient of thermal expansion before and after transition, and the Young's moduli before and after transition are the most influential ones.…”

Section: Temperature Memory Effectmentioning

confidence: 99%

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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: Multiple-sme (Shape Memory Effect)mentioning

confidence: 99%

Section: Multiple-sme (Shape Memory Effect)mentioning

confidence: 99%

Section: Temperature Memory Effectmentioning

confidence: 99%

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Mechanisms of the Shape Memory Effect in Polymeric Materials

et al. 2013

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“…Consequently, it would be useful to correlate the stress and temperature for SMP composite at temperatures above the Ts (where T Ts). Based on the thermodynamics of polymers and the experimental results of dynamic mechanical analysis, it was considered that the elastic modulus (E) of SMP composite should gradually decrease as the temperature increased (Miaudet et al, 2007;Sun and Huang, 2010;Casalini and Roland, 2004;BŠssler, 1987;Haward, 1972;He et al, 1999;Liu and Gall, 2006).…”

Section: Tool-narayanaswamy Equation For Temperature Memorisationmentioning

confidence: 99%

A phenomenological and quantitative model for shape/temperature memory effect in polypyrrole undergoing relaxation transition

Yao²,

Lin

2015

Pigment &Amp; Resin Technology

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Design/methodology/approach -In this paper, the origin of relaxation law was employed to theoretically predict the relationships between relaxation time and internal energy and temperature based on the thermodynamics of polymers.Findings -A phenomenological model was proposed to quantitatively identify the factors that influence the stored mechanical energy, shape memory effect (SME) and temperature memory effect (TME) in PPy. Both structural relaxation law and Tool-Narayanaswamy (TN) model were employed to couple the constitutive relations of stress and transition temperature as a function of relaxation frequency, respectively. Furthermore, the simulation of the phenomenological model was compared with experimental results reported in relevant literature for purpose of verification.Research implications -Exploration of the working mechanism underpinning the experimental (or phenomenal) results and significant enhancement of the understanding of relevant experimental features reported previously.Originality/value -The outcome of this study will provide a powerful phenomenological and quantitative tool for studies on SME and TME in SMPs.

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“…The other is the switching phase or domain that has, on the other hand, the ability to soften and is responsible for the temporary shape (Lendlein and Kelch 2002;Dietsch and Tong 2007;Lu and Huang 2013b;Lu et al, 2013;Sun et al, 2014;Lu and Du 2014). SMPs can retain two or sometimes three shapes, and cover a wide property ranging from stable to biodegradable, from soft to hard, and from elastic to rigid (Tobushi et al, 2001;Miaudet et al, 2007;Sun and Huang 2010). These unique characteristics enable the SMPs to be used in a myriad of fields from aerospace engineering to medical applications, since they can change shape and adopt properties in response to external stimuli (Maitland et al, 2002;Gall et al, 2004;Paik et al, 2006;Lan et al, 2009;Liu et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Temperature sensing and actuating capabilities of polymeric shape memory composite containing thermochromic particles

Yao

Lin

2015

Pigment &Amp; Resin Technology

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Purpose -The study reported here intended to create and to study multifunctional shape memory polymer (SMP) composite having temperature sensing and actuating capabilities by embedding thermochromic particles within the polymer matrix.Design/methodology/approach -The multifunctional materials were fabricated following a process consisting of blending (of the thermochromic particles and the SMP at various ratios), mixing, degasing, moulding and thermal curing, thus incorporating thermochromic particles within the polymer. The effect of the thermochromic particles on the thermomechanical properties and thermally responsive shape memory effect (SME) of the resulting multifunction SMP composites were characterised and interpreted.Findings -It was found that exposure of the composites to temperatures above 70°C led to a pronounced, reproducibly reversible change of their colour that was recorded by the thermal and electrical actuation approaches. It was also found that the colour of the composites was independent of the mechanical state of the SMP. Such effects enabled monitoring of the onset of the set/release temperature of the SMP matrix. Furthermore, the combination of thermochromic additive and the SMP resulted in significantly improved thermomechanical strength, absorption of infrared radiation and temperature distribution of the SMP composites.1 Corresponding author, e-mail: yaoyt@hit.edu.cnResearch implications -The temperature sensing and actuating capabilities of the polymeric shape memory composites developed through this study will help to extend the field of potential applications of such composites to fields including sensors, actuators, security labels and information dissemination, where colour indication is an advantageous feature.Originality/value -The shape memory polymer (SMP) composites capable of temperature sensing and actuating are novel.

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Mechanisms of the multi-shape memory effect and temperature memory effect in shape memory polymers

Cited by 235 publications

References 18 publications

Mechanisms of the Shape Memory Effect in Polymeric Materials

Mechanisms of the Shape Memory Effect in Polymeric Materials

A phenomenological and quantitative model for shape/temperature memory effect in polypyrrole undergoing relaxation transition

Temperature sensing and actuating capabilities of polymeric shape memory composite containing thermochromic particles

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