Polyurethane: A Shape Memory Polymer (SMP)

Thakur, Suman; Hu, Jinlian

doi:10.5772/intechopen.69992

Cited by 44 publications

(37 citation statements)

References 59 publications

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“…In some instances, "repeatability" is an important aspect of 4DP parts, having the ability to repeat the entire cycle without pronounced fracture or significant change to the permanent shape [19]. The "shape fixity" is the extent of a temporary shape being fixed for a "shape memory polymer" (SMP) [20]. The material properties of SMPs are described in Section 3.2.…”

Section: Properties Of 4d Printed Partsmentioning

confidence: 99%

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Concepts and Terminologies in 4D Printing

2020

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4D printing (4DP) is a promising technology that enables additive manufactured parts to be programmed for actuation, reducing the need for external power or electromechanical systems. As this area of research has grown exponentially, this review paper aims to define and establish fundamental concepts and terminologies used in the field of 4DP. The objective is to encourage researchers to adopt a more consistent approach and a standardized set of vocabulary associated with this emerging field. Even though the paper covers the most widely used definitions, the multidisciplinary nature may mean that certain words could be used interchangeably or have a different meaning in another context.

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Section: Properties Of 4d Printed Partsmentioning

confidence: 99%

“…"Shape recovery" is defined as the ability of a polymeric material to memorize the original shape from a temporary shape [20]. This "temporary shape" is also known as the "deformed shape".…”

Section: Properties Of 4d Printed Partsmentioning

confidence: 99%

Concepts and Terminologies in 4D Printing

2020

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“…Macroscopically, SMP materials are glassy state at low temperatures, rubbery state at high temperatures and mixtures of glassy and rubbery states in the transition temperature range. The thermodynamic behavior of SMP is caused by the transformation of rubbery and glassy states …”

Section: Constitutive Theorymentioning

confidence: 99%

Design and analysis of smart diaphragm based on shape memory polymer

Tao

Liu

Yang

et al. 2018

J of Applied Polymer Sci

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Currently, tank diaphragms are mostly applied in the field of aerospace but one of their limitations have to do with their inability to recycle. In the article, we discussed the modeling of a new kind of reversible diaphragm, so‐called shape memory polymer (SMP) diaphragm. A thermo‐mechanical modeling of SMP is implemented by the finite element method using a constitutive model. A single variable in this model is defined and used to simplify the model compared to other existing models. Evolution of the analysis is conducted by making use of the intermediate difference forms and Jacobian matrix, which is applied to all quantities within the model. The overturning and recovery behaviors of the SMP diaphragm are examined. And, the effect of several parameters, including thickness, height and radius of the diaphragm, as well as temperature on the overturning performance are investigated. This study led to the establishment of an optimized model with the objective function requiring minimum overturning pressure for completing deformation and design variables associated with thickness, height, radius, and temperature. An optimized SMP diaphragm is obtained under the critical pressure constraints. The results contribute to the design and application of novel SMP diaphragms. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46557.

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“…The deformed shape becomes permanent at temperature below (T g ) and the applied stress is stored inside. Upon reheating, the SMP releases its stored force and recovers its original shape [ 1 , 2 ]. One of the most commonly used SMP is segmented thermoplastic polyurethane (TPU), which consists of hard and soft segment domains.…”

Section: Introductionmentioning

confidence: 99%

Study of Shape Memory and Tensile Property of 3D Printed Sinusoidal Sample/Nylon Composite Focused on Various Thicknesses and Shape Memory Cycles

Kabir

Lee

2020

Polymers

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This study evaluated the shape memory and tensile property of 3D-printed sinusoidal sample/nylon composite for various thickness and cycles. Sinusoidal pattern of five thicknesses: 0.2 mm, 0.4 mm, 0.6 mm, 0.8 mm, and 1.0 mm were 3D-printed on nylon fabric by the fused deposition modeling (FDM) 3D printer using shape memory thermoplastic polyurethane (SMTPU). Afterward, shape memory and tensile property was investigated up to 50 shape memory cycles. The study found that 3D-printed sinusoidal sample/nylon composite had a 100% shape recovery ratio for various thicknesses up to 50 cycles. The average shape recovery rate gradually decreased from 3.0°/s to 0.7°/s whereas the response time gradually increased with the increase of a 3D-printed pattern thickness. The stress and initial modulus gradually increased with the increase of the cycle’s number. Thus, the shape memory property had a similar tendency for various cycles whereas the tensile property gradually increased with the increase of the cycle number. Moreover, this study demonstrated that this 3D-printed sinusoidal sample/nylon composite can go through more than 50 cycles without losing its tensile or shape memory property. This 3D-printed sinusoidal sample/nylon composite has vast potential as smart, reinforced, and protective clothing that requires complex three-dimensional shapes.

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Polyurethane: A Shape Memory Polymer (SMP)

Cited by 44 publications

References 59 publications

Concepts and Terminologies in 4D Printing

Concepts and Terminologies in 4D Printing

Design and analysis of smart diaphragm based on shape memory polymer

Study of Shape Memory and Tensile Property of 3D Printed Sinusoidal Sample/Nylon Composite Focused on Various Thicknesses and Shape Memory Cycles

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