Shape‐Memory Polymer in Response to Solution

Lv, Haitao; Leng, Jinsong; Liu, Y.; Du, Shiyu

doi:10.1002/adem.200800002

Cited by 207 publications

(151 citation statements)

References 11 publications

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“…This type of polymers absorb water, and this affects their mechanical and physical properties [5,6]. By disrupting intramolecular hydrogen bonds and acting as a plasticizer, water reduces the glass transition temperature, hence effectively allowing for room temperature actuation [7].…”

Section: Introductionmentioning

confidence: 99%

Chitosan Membranes Exhibiting Shape Memory Capability by the Action of Controlled Hydration

2014

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Abstract:Chitosan membranes can undergo a glass transition at room temperature triggered by hydration. The mechanical properties of the membranes were followed by a tension test and dynamic mechanical analysis (DMA), with the sample in wet conditions after being immersed in varying compositions of water/ethanol mixtures. Results show that with the increasing of water content, the Young's and storage modulus decrease systematically. For water contents of ca. 35 vol%, chitosan (CHT) exhibits a glass transition, showing an elastomeric plateau in the elastic modulus above this hydration level and the occurrence of a peak in the loss factor. Due to the semi-crystalline nature of CHT, membranes of this biomaterial present a shape memory capability induced by water uptake. By fixation of the permanent shape by further covalent cross-linking, the membranes can have different permanent shapes appropriate for different applications, including in the biomedical area.

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Section: Introductionmentioning

confidence: 99%

Chitosan Membranes Exhibiting Shape Memory Capability by the Action of Controlled Hydration

2014

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“…We conclude that the work done by Huang et al makes tremendous advance in actuation of SMP, there are many extension results and achievements are achieved by their outcomes. [1][2][3] …”

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confidence: 99%

“…Based on this, it had subsequently achieved shape recovery of polystyrene SMP by N,N-dimethylformamide. 2,3 In this comment, we want to employ thermodynamic of polymer solution, 4 Flory-Rehner approach, 5 and free-energy theory 6 to quantitatively identify the factors causing shape recovery of SMPs by their solvents. Then, a field theory is developed to couple experimental results with free-energy functions.…”

mentioning

confidence: 99%

Comment on “Water-driven programmable polyurethane shape memory polymer: Demonstration and mechanism” [Appl. Phys. Lett. 86, 114105 (2005)]

Liu

Leng

et al. 2010

Applied Physics Letters

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“…An SMP can be deformed from a permanent into a stress-free temporary shape, which can be fixed and maintained until shape recovery is triggered through an external stimulus, most common a temperature increase above the SMP's so-called transformation or switching temperature [7,10,11,[24][25][26]. Depending on the material used, stimuli can also be light [27] (UV [28], infrared or laser light [29][30][31][32][33]), electricity [30,[34][35][36][37][38][39][40][41][42][43][44], an alternating magnetic field, pH changes [49] and solvents [50][51][52][53].…”

Section: Open Accessmentioning

confidence: 99%

Review on the Functional Determinants and Durability of Shape Memory Polymers

Pretsch

2010

Polymers

112

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Shape memory polymers (SMP) belong to the class of stimuli-responsive materials and have generated significant research interest. Their capability to retain an imposed, temporary shape and to recover the initial, permanent shape upon exposure to an external stimulus depends on the "functional determinants", which in simplistic terms, can be divided into structural/morphological and processing/environmental factors. The primary aim of the first part of this review is to reflect the knowledge about these fundamental relationships. In a next step, recent advances in shape memory polymer composites are summarized. In contrast to earlier reviews, studies on the impairment of shape memory properties through various factors, such as aging, compression and hibernation, lubricants, UV light and thermo-mechanical cycling, are extensively reviewed. Apart from summarizing the state-of-the-art in SMP research, recent progress is commented.

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Shape‐Memory Polymer in Response to Solution

Cited by 207 publications

References 11 publications

Chitosan Membranes Exhibiting Shape Memory Capability by the Action of Controlled Hydration

Chitosan Membranes Exhibiting Shape Memory Capability by the Action of Controlled Hydration

Comment on “Water-driven programmable polyurethane shape memory polymer: Demonstration and mechanism” [Appl. Phys. Lett. 86, 114105 (2005)]

Review on the Functional Determinants and Durability of Shape Memory Polymers

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