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Journal ArticleDOI: 10.1080/00038628.2020.1742644

Design-to-fabrication with thermo-responsive shape memory polymer applications for building skins

04 Mar 2021-Architectural Science Review (Taylor & Francis)-Vol. 64, pp 72-86
Abstract: Smart materials are studied for climate-responsive building skins due to internal changeable properties stimulated by material-specific input. This research focuses on shape memory polymer (SMP) an...

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Topics: Shape-memory polymer (59%), Smart material (55%)
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10 results found


26 Sep 2018-

321 Citations


Open accessJournal ArticleDOI: 10.3390/POLYM12091914
25 Aug 2020-Polymers
Abstract: In this work, a novel type of polyester urethane urea (PEUU) foam is introduced. The foam was produced by reactive foaming using a mixture of poly(1,10–decamethylene adipate) diol and poly(1,4–butylene adipate) diol, 4,4′-diphenylmethane diisocyanate, 1,4–butanediol, diethanolamine and water as blowing agent. As determined by differential scanning calorimetry, the melting of the ester-based phases occurred at temperatures in between 25 °C and 61 °C, while the crystallization transition spread from 48 °C to 20 °C. The mechanical properties of the foam were simulated with the hyperplastic models Neo-Hookean and Ogden, whereby the latter showed a better agreement with the experimental data as evidenced by a Pearson correlation coefficient R² above 0.99. Once thermomechanically treated, the foam exhibited a maximum actuation of 13.7% in heating-cooling cycles under a constant external load. In turn, thermal cycling under load-free conditions resulted in an actuation of more than 10%. Good thermal insulation properties were demonstrated by thermal conductivities of 0.039 W·(m·K)−1 in the pristine state and 0.052 W·(m·K)−1 in a state after compression by 50%, respectively. Finally, three demonstrators were developed, which closed an aperture or opened it again simply by changing the temperature. The self-sufficient material behavior is particularly promising in the construction industry, where programmable air slots offer the prospect of a dynamic insulation system for an adaptive building envelope.

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7 Citations


Open accessJournal ArticleDOI: 10.3390/SU12114391
27 May 2020-Sustainability
Abstract: Smart materials with changeable properties responding to environmental changes are studied in architecture. Shape Memory Polymer (SMP) is preferred among available thermo-responsive smart materials for architectural applications because of its advantages of reaction temperatures, deformation patterns, shape-changing behaviors, opportunity for various forms and manufacturing processing, in addition to the shape memory effect. Of various facade elements, this study focuses on designing and validating the SMP components as prototypes for shading devices for the Climate Adaptive Building Skin (CABS), to approach design decisions of optimal activation temperature, size, arrangements, and operating scenarios using digital models and simulation tools following the presented research framework in conjunction with design-to-fabrication studies in parallel. Prior to performance evaluations, the operating principles of SMP shading devices and interpretation of temperature data in relation to the urban conditions are prescribed. This research is based on a sustainability assessment of state-of-the-art responsive facade design integrating SMP elements combining active and passive measures to support a sustainable architectural design that provides less heat gain and better daylight comfort while demonstrating the simplified performance analysis method of SMP prototype designs. Following the simulation and comparative analysis of the results, drawbacks, and cautions inherent in the simulation methods, the potential meaning is briefly discussed.

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7 Citations


Open accessJournal ArticleDOI: 10.1177/1045389X211027954
Abstract: Severe challenges such as depletion of natural resources, natural catastrophes, extreme weather conditions, or overpopulation require intelligent solutions especially in architecture. Built environ...

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5 Citations


Open access
01 Jan 2015-
Abstract: The research presents an architectural method and model that organise material composites into weather-powered response building envelopes. The work is done through a set of simulation strategies including simulation of thermal sensation, simulation of material behaviours of a developed dynamic architectural envelope based on bi-material deflection and simulation of a design process based on evolutionary computation. The work finds that the proposed method and model can create dynamic expressive and environment-oriented functional building envelopes. The approach allow time-based articulation and making of architectures that respond to the thermal environment, thereby creating a basis for developing buildings that are intimately linked to dynamic environmental and human occupancy patterns.

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Topics: Design process (50%)

4 Citations


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78 results found


Open accessJournal ArticleDOI: 10.1038/S41598-016-0001-8
05 Dec 2016-Scientific Reports
Abstract: Krabbe disease (KD) is a neurodegenerative disorder caused by the lack of β- galactosylceramidase enzymatic activity and by widespread accumulation of the cytotoxic galactosyl-sphingosine in neuronal, myelinating and endothelial cells. Despite the wide use of Twitcher mice as experimental model for KD, the ultrastructure of this model is partial and mainly addressing peripheral nerves. More details are requested to elucidate the basis of the motor defects, which are the first to appear during KD onset. Here we use transmission electron microscopy (TEM) to focus on the alterations produced by KD in the lower motor system at postnatal day 15 (P15), a nearly asymptomatic stage, and in the juvenile P30 mouse. We find mild effects on motorneuron soma, severe ones on sciatic nerves and very severe effects on nerve terminals and neuromuscular junctions at P30, with peripheral damage being already detectable at P15. Finally, we find that the gastrocnemius muscle undergoes atrophy and structural changes that are independent of denervation at P15. Our data further characterize the ultrastructural analysis of the KD mouse model, and support recent theories of a dying-back mechanism for neuronal degeneration, which is independent of demyelination.

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Topics: Krabbe disease (55%), Denervation (54%), Galactosylceramidase (53%) ... read more

6,312 Citations


23 Feb 1999-Angewandte Chemie
Abstract: Shape memory polymer compositions, articles of manufacture thereof, and methods of preparation and use thereof are described. The shape memory polymer compositions can hold more than one shape in memory. Suitable compositions include at least one hard segment and at least one soft segment. The Ttrans of the hard segment is preferably between -30 and 270 °C. At least one of the hard or soft segments can contain a cross-linkable group, and the segments can be linked by formation of an interpenetrating network or a semi-interpenetrating network, or by physical interactions of the blocks. Objects can be formed into a given shape at a temperature above the Ttrans of the hard segment, and cooled to a temperature below the Ttrans of the soft segment. If the object is subsequently formed into a second shape, the object can return to its original shape by heating the object above the Ttrans of the soft segment and below the Ttrans of the hard segment. The compositions can also include two soft segments which are linked via functional groups which are cleaved in response to application of light, electric field, magnetic field or ultrasound. The cleavage of these groups causes the object to return to its original shape.

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2,837 Citations


Journal ArticleDOI: 10.1016/J.PMATSCI.2011.03.001
Jinsong Leng1, Xin Lan1, Yanju Liu1, Shanyi Du1Institutions (1)
Abstract: Shape-memory polymers (SMPs) undergo significant macroscopic deformation upon the application of an external stimulus (e.g., heat, electricity, light, magnetism, moisture and even a change in pH value). They have been widely researched since the 1980s and are an example of a promising smart material. This paper aims to provide a comprehensive review of SMPs, encompassing a fundamental understanding of the shape-memory effect, fabrication, modeling and characterization of SMPs, various actuation methods and multifunctional properties of SMP composites, and potential applications for SMP structures. A definition of SMPs and their fundamentals are first presented. Next, a description of their fabrication, characterization and constitutive models of SMPs are introduced. SMP composites, which act to improve a certain function as functional materials or the general mechanical properties as structural materials, are briefly discussed. Specially, the SMP composites can be developed into multifunctional materials actuated by various methods, such as thermal-induced, electro-activated, light-induced, magnetic-actuated and solution-responsive SMPs. As smart materials, the applications of SMPs and their composites receive much interest, including deployable structures, morphing structures, biomaterials, smart textiles and fabrics, SMP foams, automobile actuators and self-healing composite systems.

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Topics: Smart material (56%), Shape-memory polymer (50%)

1,014 Citations


Journal ArticleDOI: 10.1007/S10853-007-2176-7
Abstract: Shape memory polymers (SMPs) belong to a class of smart polymers, which have drawn considerable research interest in last few years because of their applications in microelectromechanical systems, actuators, for self healing and health monitoring purposes, and in biomedical devices. Like in other fields of applications, SMP materials have been proved to be suitable substitutes to metallic ones because of their flexibility, biocompatibility and wide scope of modifications. The shape memory properties of SMPs polymers might surpass those of shape memory metallic alloys (SMAs). In addition to block copolymers, polymers blends and interpenetrating network structured SMP systems have been developed. The present review mainly highlights the recent progress in synthesis, characterization, evaluation, and proposed applications of SMPs and related composites.

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Topics: Shape-memory polymer (52%)

809 Citations


Open accessJournal ArticleDOI: 10.1016/J.PROGPOLYMSCI.2015.04.001
Qian Zhao1, H. Jerry Qi2, Tao Xie1Institutions (2)
Abstract: Shape memory polymers (SMPs), as a class of programmable stimuli-responsive shape changing polymers, are attracting increasing attention from the standpoint of both fundamental research and technological innovations. Following a brief introduction of the conventional shape memory effect (SME), progress in new shape memory enabling mechanisms and triggering methods, variations of in shape memory forms (shape memory surfaces, hydrogels, and microparticles), new shape memory behavior (multi-SME and two-way-SME), and novel fabrication methods are reviewed. Progress in thermomechanical modeling of SMPs is also presented.

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Topics: Shape-memory polymer (56%)

796 Citations


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