Shape‐Memory Polymers

Behl, Marc; Lendlein, Andreas

doi:10.1002/0471238961.1908011612051404.a01.pub2

Cited by 44 publications

(6 citation statements)

References 70 publications

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“…Thermoset SMPs can be obtained by synthesis or postpolymerization techniques including ionizing radiation and chemical cross-link creation. 55 However, ionizing radiation may cause chain scission rather than crosslinking. Zhu et al 56 studied the effect of c-radiation on the formation of crosslinks in PCL polymer with different molecular weights.…”

Section: Classification Of Smps Based On Crosslinksmentioning

confidence: 99%

A Review on Additive Manufacturing of Shape-Memory Materials for Biomedical Applications

Sabahi

Chen

Wang

et al. 2020

JOM

129

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Shape-memory materials (SMMs) are characterized by their unique ability to remember and recover their shape in response to external stimuli. Over recent decades, the use of SMMs in biomedical areas such as tissue engineering, drug delivery, endovascular surgery, orthodontics, orthopedics, etc. has attracted significant attention from both academia and industry. Recently, additive manufacturing (AM) has also attracted growing interest for biomedical applications because of its ability to produce on-demand, patient-tailored devices for medical treatments. This article provides a review of current state-ofthe-art AM techniques for producing SMMs for biomedical applications. First, both shape-memory alloys and shape-memory polymers are discussed regarding their fundamental characteristics and compositions, and the general principles governing their shape-memory effects. Next, current and potential biomedical applications of SMMs are presented, then available AM techniques that have been used for the fabrication of SMM-based medical devices are discussed and explored. Finally, an outlook on AM of SMMs for biomedical applications is provided.

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Section: Classification Of Smps Based On Crosslinksmentioning

confidence: 99%

A Review on Additive Manufacturing of Shape-Memory Materials for Biomedical Applications

Sabahi

Chen

Wang

et al. 2020

JOM

129

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“…Recently, stimuli‐responsive shape memory polymers (SMPs) have attracted considerable interest due to their tunable mechanical properties under the external trigger, [ 1,2 ] such as light, [ 3–5 ] heat, [ 6–8 ] electricity, [ 9,10 ] and so on. When the SMPs are heated above the glass transition temperature ( T g ), it would become soft, which could be changed into arbitrary shapes under external pressure.…”

Section: Introductionmentioning

confidence: 99%

Noncontact All‐In‐Situ Reversible Reconfiguration of Femtosecond Laser‐Induced Shape Memory Magnetic Microcones for Multifunctional Liquid Droplet Manipulation and Information Encryption

Jiao

Zhang

et al. 2021

Adv Funct Materials

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Shape memory polymers can change their shapes in a controlled way under external stimuli and thus promote the development of smart devices, soft robotics, and microfluidics. Here, a kind of iron particles (IPs) doped shape memory microcone is developed for noncontact all‐in‐situ reversible tuning between the tilted and upright state under near‐infrared (NIR) irradiation and magnetic field (MF) actuation. The magnetic microcones are simply fabricated by a laser‐ablated replica‐molding strategy so that their height can be precisely controlled by adjusting the laser machining parameters. In addition, it is found that the droplets can be transported unidirectionally on the tilted microcones, which is related to the variation of the adhesion force induced by the length of the triple contact line (TCL). Finally, other multifunctional applications have also been realized, such as, selective droplet release, information encryption, rewritable display, and reusable temperature switch. This work may provide a facile strategy for developing multiresponsive smart devices based on shape memory polymers.

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“…[20,21] Despite their advantages, polymeric plugs suffer low strength and short lifetime, especially given the harsh drilling environment. [22] Shape memory polymers (SMPs) were discovered in 1984 [23] and have recently attracted lots of attention as unconventional LCMs. These polymers are set in temporary shape, and when triggered by an external stimulus such as heat, pH, light, electric field, water and magnetic field recovered their original shape.…”

Section: Introductionmentioning

confidence: 99%

Shape Memory Polyurethane as a Drilling Fluid Lost Circulation Material

Lashkari

Tabatabaei‐Nezhad

Husein

2021

Macro Materials & Eng

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Drilling fluid loss is a major problem with serious economic and environmental consequences. The use of traditional lost circulation materials (LCMs) to seal wide fractures increases the risk of bit nozzle plugging. In this work, smart LCMs based on shape memory polyurethane (SMPU) are proposed for the first time. SMPU can be programmed to recover at temperatures suited to a given well. As such, SMPU smoothly passes through the bit nozzles, while effectively seal wide fractures once activated. The SMPU is prepared by two step pre-polymerization and characterized by Fourier transform infrared spectra, X-ray diffraction, and differential scanning calorimeter. The SMPU is programmed by changing and fixing the original shape to a temporary shape through a thermo-mechanical process. The shape memory behavior of SMPU is analyzed by tensile apparatus. Compatibility of SMPU with WBMs is determined from mud rheology and filtration tests. Fracture sealing efficiency and shape recovery of SMPU are evaluated by a modified particle permeability apparatus fitted with a model fracture. The results confirm high sealing and shape recovery attributes of SMPU. The plug formed at 114 kg m -3 SMPU and 80 °C experiences a sealing pressure of 100 bar with 71.5 cm 3 cumulative fluid loss.

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Shape‐Memory Polymers

Cited by 44 publications

References 70 publications

A Review on Additive Manufacturing of Shape-Memory Materials for Biomedical Applications

A Review on Additive Manufacturing of Shape-Memory Materials for Biomedical Applications

Noncontact All‐In‐Situ Reversible Reconfiguration of Femtosecond Laser‐Induced Shape Memory Magnetic Microcones for Multifunctional Liquid Droplet Manipulation and Information Encryption

Shape Memory Polyurethane as a Drilling Fluid Lost Circulation Material

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