Stimuli-Responsive Shape Changing Commodity Polymer Composites and Bilayers

Verpaalen, Rob C. P.; Engels, Tap Tom; Schenning, Albert P. H. J.; Debije, Michael G.

doi:10.1021/acsami.0c10802

Cited by 45 publications

(33 citation statements)

References 110 publications

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“…[51] In contrast to the crystal melting mechanisms, 2WSMP actuators can be prepared by joining two polymers, where one polymer undergoes a high volumetric change in response to an external stimulus such as heat or light. [52][53][54] These actuators are commonly based on the difference in the coefficient of thermal expansion (CTE) of the polymers, similar to bimetal devices. During heating, the layer with a higher CTE (i.e., the active layer) expands more than the passive layer, which leads to bending of the actuator.…”

Section: Introductionmentioning

confidence: 99%

Remote Propulsion of Miniaturized Mechanical Devices via Infrared‐Irradiated Reversible Shape Memory Polymers

Carmiel¹,

Bram

Atar³

et al. 2022

Advanced Intelligent Systems

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Remote propulsion of miniature mechanical devices possesses a great challenge to the scientific community. Herein, a lightweight two‐way shape memory polymer (2WSMP)‐based motor is presented, which operates a demo vehicle via a novel infrared‐irradiated 2WSMP actuator. Most of the polymers that possess 2WSMP properties suffer from inadequate mechanical properties and low durability in harsh environments. Herein, the 2WSMP bilayer actuator, based on Kapton and polyPOSS (PP), possesses superior 2WSMP and mechanical properties, high lifting abilities, and durability in harsh environments. Kapton is well known for its outstanding physical properties. PP, a polyhedral oligomeric silsesquioxane (POSS)‐based epoxy‐like thermoset, possesses unique properties. Its advanced ability to maintain mechanical properties over a range of temperatures, while presenting a constant coefficient of thermal expansion, is essential for its 2WSMP actuation properties. The effects of the Kapton and PP layers’ thickness on the force and deflection, generated by the 2WSMP actuators during heating, are studied. A theoretical model is used to predict the actuator's deflection, based on the layers’ thickness. These actuators present excellent thermal stability at temperatures as high as 150 °C, while maintaining outstanding motion repeatability and extremely high lifting capacity of up to 6500 times of their own weight.

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Section: Introductionmentioning

confidence: 99%

Remote Propulsion of Miniaturized Mechanical Devices via Infrared‐Irradiated Reversible Shape Memory Polymers

Carmiel¹,

Bram

Atar³

et al. 2022

Advanced Intelligent Systems

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“…Due to their ease of processing, high corrosion and electrical resistances, and relatively low costs and weight, polymers are widely used in daily life. − However, bulk polymers generally have relatively low thermal conductivities (usually <1 W m –1 K –1 ), which limit their application as thermal management materials for heat exchangers, electronic devices, and solar cells, for example. − …”

Section: Introductionmentioning

confidence: 99%

Enhanced Thermal Conductivity in Oriented Polyvinyl Alcohol/Graphene Oxide Composites

Pan

Debije

Schenning³

et al. 2021

ACS Appl. Mater. Interfaces

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Polymer composites have attracted increasing interest as thermal management materials for use in devices owing to their ease of processing and potential lower costs. However, most polymer composites have only modest thermal conductivities, even at high concentrations of additives, resulting in high costs and reduced mechanical properties, which limit their applications. To achieve high thermally conductive polymer materials with a low concentration of additives, anisotropic, solid-state drawn composite films were prepared using water-soluble polyvinyl alcohol (PVA) and dispersible graphene oxide (GO). A co-additive (sodium dodecyl benzenesulfonate) was used to improve both the dispersion of GO and consequently the thermal conductivity. The hydrogen bonding between GO and PVA and the simultaneous alignment of GO and PVA in drawn composite films contribute to an improved thermal conductivity (∼25 W m –1 K –1 ), which is higher than most reported polymer composites and an approximately 50-fold enhancement over isotropic PVA (0.3–0.5 W m –1 K –1 ). This work provides a new method for preparing water-processable, drawn polymer composite films with high thermal conductivity, which may be useful for thermal management applications.

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“…Stimulus-responsive color-switching materials have attracted immense attention as they can be used to fabricate novel DOI: 10.1002/advs.202103309 sensors, [1][2][3][4] display units, [5,6] and products of daily use. [7][8][9] Light-responsive colorswitching materials (LCMs) are currently the most popular among all the stimuliresponsive (such as heat-, [10][11][12] light-, [13][14][15] water-, [16,17] electricity-, [18,19] force-, [20][21][22] magnetism [23] -responsive) materials. This is mainly because light is a form of clean and non-contact stimulus, and the wavelength and intensity of light can be readily tuned in time and space.…”

Section: Introductionmentioning

confidence: 99%

Multi‐Component Collaborative Step‐by‐Step Coloring Strategy to Achieve High‐Performance Light‐Responsive Color‐Switching

Zhang

Gai

et al. 2021

Advanced Science

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Light‐responsive color‐switching materials (LCMs) are long‐lasting hot fields. However, non‐ideal comprehensive performance (such as color contrast and retention time cannot be combined, unsatisfactory repeatability, and non‐automated coloring mode) significantly hinder their development toward high‐end products. Herein, the development of LCMs that exhibit long retention time, good color contrast, repeatability, and the property of automatic coloring is reported. The realization of this goal stems from the adoption of a bio‐inspired multi‐component collaborative step‐by‐step coloring strategy. Under this strategy, a conventional one‐step photochromic process is divided into a “light+heat” controlled multi‐step process for the fabrication of the desired LCMs. The obtained LCMs can effectively resist the long‐troubled ambient‐light interference and avoid its inherent yellow background, thereby achieving the longest retention time and good repeatability. Multiple colors are generated and ultra‐fast imaging compatible with the laser‐printing technology is also realized. The application potential of the materials in short‐term reusable identity cards, absorptive readers, billboards, and shelf labels is demonstrated. The results reported herein can potentially help in developing and designing various high‐performance, switchable materials that can be used for the production of high‐end products.

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Stimuli-Responsive Shape Changing Commodity Polymer Composites and Bilayers

Cited by 45 publications

References 110 publications

Remote Propulsion of Miniaturized Mechanical Devices via Infrared‐Irradiated Reversible Shape Memory Polymers

Remote Propulsion of Miniaturized Mechanical Devices via Infrared‐Irradiated Reversible Shape Memory Polymers

Enhanced Thermal Conductivity in Oriented Polyvinyl Alcohol/Graphene Oxide Composites

Multi‐Component Collaborative Step‐by‐Step Coloring Strategy to Achieve High‐Performance Light‐Responsive Color‐Switching

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