Healing of shape memory polyurethane fiber-reinforced syntactic foam subjected to tensile stress

Zhang, Pengfei; Ogunmekan, Babatunde; Ibekwe, Samuel; Jerro, Dwayne; Pang, Su‐Seng; Li, Guoqiang

doi:10.1177/1045389x15610912

Cited by 30 publications

(10 citation statements)

References 54 publications

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“…Among SMPs, polyurethane (PU) and its nanocomposites were studied by many researchers (Cai et al, 2013; Gu et al, 2016; Zhang et al, 2015). Thermoplastic polyurethane (TPU), as a popular SMP material, is shown to be a suitable material for medical equipment because of its flexibility, durability, and biological stability (Simmons et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

An experimental–numerical study on shape memory behavior of PU/PCL/ZnO ternary blend

Shirsavar

Baghani

Taghavimehr

et al. 2018

Journal of Intelligent Material Systems and Structures

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Shape memory polymer composites have attracted significant attention due to novel properties and great applications. In this article, we focus on the fabrication and simulation of polyurethane/polycaprolactone nanocomposites. The polyurethane/polycaprolactone blends containing ZnO nanoparticles (5 to 30 wt%) are fabricated using a solution mixing and casting method. It is found that significant improvement of polyurethane/polycaprolactone composites in Young’s modulus is achieved by incorporating 20 wt% of ZnO nanoparticles; also, the results of the shape recovery ratio reveal that adding an optimum amount of ZnO (the reinforcement) can increase the shape recovery ratio (for 20 wt% of ZnO). These results could most likely be explained by the fact that some particles restrict the hard segment–soft segment interactions and provide more mobility to polycaprolactone components, while the other nanoparticles can act as the nucleating agent for polycaprolactone chains. A generalized Maxwell model is then used to examine the shape memory behavior of shape memory polymer composites. The dynamic mechanical thermal analysis results are utilized to define the model coefficients and the simulation is carried out to determine the shape recovery ratio. Simulation of this shape recovery ratio for shape memory polymer composites reveals that the numerical results are in good agreement with those of the experimental data.

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Section: Introductionmentioning

confidence: 99%

An experimental–numerical study on shape memory behavior of PU/PCL/ZnO ternary blend

Shirsavar

Baghani

Taghavimehr

et al. 2018

Journal of Intelligent Material Systems and Structures

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“…After that, the molten thermoplastic resin particles flowed to complete the crack filling and repair. Moreover, Zhang et al [109] further introduced SMPFs into foam and other structures to achieve the self-healing function of fiber reinforced composites.…”

Section: Self-healingmentioning

confidence: 99%

Shape Memory Polymer Fibers: Materials, Structures, and Applications

et al. 2021

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Shape memory polymer (SMP) is a kind of material that can sense and respond to the changes of the external environment, and its behavior is similar to the intelligent reflection of life. Electrospinning, as a versatile and feasible technique, has been used to prepare shape memory polymer fibers (SMPFs) and expand their structures. SMPFs show some advanced features and functions in many fields. In this review, we give a comprehensive overview of SMPFs, including materials, fabrication methods, structures, multifunction, and applications. Firstly, the mechanism and characteristics of SMP are introduced. We then discuss the electrospinning method to form various microstructures, like non-woven fibers, core/shell fibers, hollow fibers and oriented fibers. Afterward, the multiple functions of SMPFs are discussed, such as multi-shape memory effect, reversible shape memory effect and remote actuation of composites. We also focus on some typical applications of SMPFs, including biomedical scaffolds, drug carriers, self-healing, smart textiles and sensors, as well as energy harvesting devices. At the end, the challenges and future development directions of SMPFs are proposed.

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“…Based on previous studies, it is found that both the recovery strain and recovery stress of the tension‐programmed SMP fibers play a key role in closing cracks 20 . In particular, a certain recovery stress is needed to overcome the constraint by materials surrounding the crack or even by external tensile load in order to bring the fractured surfaces in contact 12,16,21 . While shape memory polymers usually have large recovery strain, their recovery stress is limited 22 .…”

Section: Introductionmentioning

confidence: 99%

Influence of uniaxial compression on the shape memory behavior of vitrimer composite embedded with tension‐programmed unidirectional shape memory polymer fibers

Afful

Ibekwe

Mensah

et al. 2020

J of Applied Polymer Sci

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Tension programmed shape memory polymer (SMP) fibers have been used as sutures for closing wide‐opened cracks per the close‐then‐heal strategy. However, the composite may be subjected to compression loading during service. These compression loads can reduce the amount of recoverable strain in these pre‐tensioned fibers, limiting their ability to close cracks. The purpose of this study is to investigate the effect of in‐service compression loading on the shape memory effect (SME) of composites consisting of SMP fiber and SMP matrix. To this end, pre‐stretched shape memory Polyethylene Terephthalate (PET) fibers were embedded into a shape memory vitrimer to obtain composite samples with different fiber volume fractions. The SME of both the PET fiber and the vitrimer was investigated. The effect of compression load on the SME of the composite was studied. It is found that, uniaxial compression on the composite along the fiber direction significantly reduced the shrinking ability of the embedded pre‐tensioned SMP fibers. Hence, this is a factor that needs to be considered when designing such types of self‐healing composites.

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Healing of shape memory polyurethane fiber-reinforced syntactic foam subjected to tensile stress

Cited by 30 publications

References 54 publications

An experimental–numerical study on shape memory behavior of PU/PCL/ZnO ternary blend

An experimental–numerical study on shape memory behavior of PU/PCL/ZnO ternary blend

Shape Memory Polymer Fibers: Materials, Structures, and Applications

Influence of uniaxial compression on the shape memory behavior of vitrimer composite embedded with tension‐programmed unidirectional shape memory polymer fibers

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