Water-responsive programmable shape memory polymer devices

Huang, Wei; Yang, Bin; Liu, N.; Phee, Soo Jay

doi:10.1117/12.779663

Cited by 15 publications

(5 citation statements)

References 17 publications

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“…On the other hand, a few new shape memory phenomena have been discovered [31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47], which not only enhance the flexibility of the current shape memory technology, but also add in new dimensions for extended versatility and adoptability. Consequently, a number of novel concepts have been proposed for a range of engineering applications [45,[48][49][50][51][52][53][54], in particular in the field of biomedical engineering as of the last couple of years [24,43,[55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70].…”

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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“…It is clear that the phase transition approach is more flexible for simulation of SMPs. with a diameter of 10s m, much thinner than human hair, can be easily produced as sutures [8,130].…”

Section: Comparison Of Models For Thermo-responsive Polymeric Smmsmentioning

confidence: 99%

“…SMP stents can be made into a solid tube shape to effectively prevent tissue in-growth. Drug eluting is easier to achieve to prevent infection [8,130]. Figure 2.2 shows that by folding a circular shaped SMP ring into a star shape at high temperatures, it is going to be much easier to pack the stent into a catheter for later on delivery and deployment.…”

Section: Comparison Of Models For Thermo-responsive Polymeric Smmsmentioning

confidence: 99%

Shape memory technology : working mechanisms, modeling and surface patterning application

Zhao¹

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A new way to classify shape memory materials (SMMs) was proposed based on the underlying working mechanisms behind the shape memory effect (SME). Three categories, namely dual-state mechanism, dual-component mechanism, and partial-transition mechanism, were discussed in details. Based on this, the concept of advanced shape memory technology was proposed to enable the SME in materials, to design/synthesize new SMMs with tailored features, and to optimize the SME in materials. Previously, SME is considered as a unique behavior in some certain materials. In this study, based on ASMT, SME can be achieved in a range of materials, which are not the traditional SMMs. A generic 3-D model was developed to simulate the shape memory behavior in polymeric SMMs. This model was verified by a series of experiments. In addition, this model was applied for optimization of the SME. The thermo-/chemo-responsive SME in poly(methyl methacrylate) (PMMA) were systematically studied by experiments and simulation. Based on above study on the fundamentals, different surface patterning methods were developed to fabricate micro/nano-sized surface features, including well-controllable wrinkled patterns, PMMA microlens arrays, reversible surface patterns and 3-D surface patterns.

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“…The shape memory response of the material was evaluated on the tubular specimens, by first folding them into a six-arms star-shaped temporary configuration, possibly resembling some stent prototypes [25], and later monitoring the recovery of their original shape. The shape memory effect was studied as a function of time and temperature by measuring the timeevolution of the specimen shape during isothermal recovery tests (similarly to [26,27]) with all the testing conditions being summarized in Table 1 The tubular specimens were heated at about 80 °C and crimped in a star configuration by means of an ad-hoc designed tool (see Figure 2); to effectively fix this temporary configuration, the deformed specimen, within the crimping tool, were put in a refrigerator at -17 °C and maintained at this temperature prior than testing.…”

Section: Star Folding Testsmentioning

confidence: 99%

Modeling Approach and Finite Element Analyses of a Shape Memory Epoxy-Based Material

Battini

Avanzini

Pandini

et al. 2020

Lecture Notes in Mechanical Engineering

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A series of structurally related epoxy resins were prepared as model systems for the investigation of the shape memory response, tailoring their thermo-mechanical response and describing their strain evolution under triggering stimuli with a thermo-viscoelastic model. The shape memory behavior on epoxy resin was modeled through the definition of linear viscoelastic parameters, in combination with the general time-temperature reduction scheme. Specifically, this translates into the definition of a hyperelastic response enriched with a Prony series to implement time dependency and a William-Landel-Ferry (WLF) equation to implement temperature dependency. While the hyperelastic response parameters are found with a standard fitting procedure on compression tests, finding the correct parameters for the Prony series might be challenging. For this reason, an ad-hoc optimization process was coded in Mathworks Matlab environment: proper guess values are created and then a chain of constrained optimizers (such as genetic, particle swarm, pattern search and different nonlinear programming algorithms) with smart evolving boundaries looks for the right set of parameters. The ability to correctly predict strain history and shape transitions with a finite element model was evaluated on a case study for self-deployment of a folded tubular structure. Tubular specimens were tested and the model was used to reproduce the switching from a temporary folded six-pointed star shape to their original cylindrical shape. Overall, this approach proved to be a very effective way to simulate complex shape memory responses in time and temperature domains, for which standard Dynamic Mechanical Analyses (DMA) and uniaxial tensile or compression tests are sufficient to calibrate material parameters for Finite Element (FE) implementation.

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Water-responsive programmable shape memory polymer devices

Cited by 15 publications

References 17 publications

Mechanisms of the Shape Memory Effect in Polymeric Materials

Mechanisms of the Shape Memory Effect in Polymeric Materials

Shape memory technology : working mechanisms, modeling and surface patterning application

Modeling Approach and Finite Element Analyses of a Shape Memory Epoxy-Based Material

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