Body temperature-responsive two-way and moisture-responsive one-way shape memory behaviors of poly(ethylene glycol)-based networks

Yang, Guang; Liu, Xueyang; Tok, Alfred Iing Yoong; Lipik, Vitali

doi:10.1039/c7py00786h

Cited by 58 publications

(54 citation statements)

References 34 publications

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“…The polymer is also a moisture‐responsive one‐way SMP. [ 203 ] By creating an IPN consisting PPD‐PCL which has two different crystal segments with different critical temperatures, Zotzmann et al. made a three way reversible SMP.…”

Section: Other Smart Polymersmentioning

confidence: 99%

Smart Polymers for Microscale Machines

Tan

Davis

Cappelleri

2020

Adv Funct Materials

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Microscale machines are able to perform a number of tasks like micromanipulation, drug‐delivery, and noninvasive surgery. In particular, microscale polymer machines that can perform intelligent work for manipulation or transport, adaptive locomotion, or sensing are in‐demand. To achieve this goal, shape‐morphing smart polymers like hydrogels, liquid crystalline polymers, and other smart polymers are of great interest. Structures fabricated by these materials undergo mechanical motion under stimulation such as temperature, pH, light, and so on. The use of these materials renders microscale machines that undergo complex stimuli‐responsive transformation such as from planar to 3D by combining spatial design like introducing in‐plane or out‐plane differences. During the past decade, many techniques have been developed or adopted for fabricating structures with smart polymers including microfabrication methods and the well‐known milestone of 4D printing, starting in 2013. In this review, the existing or potential active smart polymers that could be used to fabricate active microscale machines to accomplish complex tasks are summarized.

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Section: Other Smart Polymersmentioning

confidence: 99%

Smart Polymers for Microscale Machines

Tan

Davis

Cappelleri

2020

Adv Funct Materials

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“…However, in the one-step cross-linking process, small molecules or polymeric liquid crystal precursors are macroscopically oriented by applying an external field. After that, aligned precursors are polymerized/cross-linked to form a macroscopically anisotropic LCE [ 41 , 42 , 43 , 44 ]. However, in the physical process, the monodomain formation occurs via hanging an external weight or stress to the already synthesized LCE polydomains [ 45 ].…”

Section: Shape-memory Polymeric Artificial Musclesmentioning

confidence: 99%

Shape-Memory Polymeric Artificial Muscles: Mechanisms, Applications and Challenges

Chen

Rehman

et al. 2020

Molecules

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Shape-memory materials are smart materials that can remember an original shape and return to their unique state from a deformed secondary shape in the presence of an appropriate stimulus. This property allows these materials to be used as shape-memory artificial muscles, which form a subclass of artificial muscles. The shape-memory artificial muscles are fabricated from shape-memory polymers (SMPs) by twist insertion, shape fixation via Tm or Tg, or by liquid crystal elastomers (LCEs). The prepared SMP artificial muscles can be used in a wide range of applications, from biomimetic and soft robotics to actuators, because they can be operated without sophisticated linkage design and can achieve complex final shapes. Recently, significant achievements have been made in fabrication, modelling, and manipulation of SMP-based artificial muscles. This paper presents a review of the recent progress in shape-memory polymer-based artificial muscles. Here we focus on the mechanisms of SMPs, applications of SMPs as artificial muscles, and the challenges they face concerning actuation. While shape-memory behavior has been demonstrated in several stimulated environments, our focus is on thermal-, photo-, and electrical-actuated SMP artificial muscles.

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“…4D printing SMPs can achieve much faster printing speeds and higher structure stiffness than printed hydrogels [20]. The use of poly (ethylene glycol) (PEG) in tissue engineering applications has been widely reported [34,55]. PEG is a water-responsive polymer, so it can be employed where moisture-responsive actuation is required.…”

Section: Shape-memory Polymersmentioning

confidence: 99%

4D Printing: Materials, Technologies, and Future Applications in the Biomedical Field

et al. 2020

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4D printing can be defined as the fabrication of structures using smart materials that allow the final object to change its shape, properties, or function in response to an external stimulus such as light, heat, or moisture. The available technologies, materials, and applications have evolved significantly since their first development in 2013, with prospective applications within the aerospace, manufacturing, and soft robotic industries. This review focuses on the printing technologies and smart materials currently available for fabricating these structures. The applications of 4D printing within biomedicine are explored with a focus on tissue engineering, drug delivery, and artificial organs. Finally, some ideas for potential uses are proposed. 4D printing is making its mark with seemingly unlimited potential applications, however, its use in mainstream medical treatments relies on further developments and extensive research investments.

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Body temperature-responsive two-way and moisture-responsive one-way shape memory behaviors of poly(ethylene glycol)-based networks

Cited by 58 publications

References 34 publications

Smart Polymers for Microscale Machines

Smart Polymers for Microscale Machines

Shape-Memory Polymeric Artificial Muscles: Mechanisms, Applications and Challenges

4D Printing: Materials, Technologies, and Future Applications in the Biomedical Field

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