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Site powered by Webvision. Skip to main content Skip to navigation Create your free account Registration is free, quick and easy. No comments. Qian Zhao and Dr. Tao Xie. References Q Zhao et al , Sci. Topics Materials Matter Polymers Shape memory. Related Articles. Research Reverse gear makes metamaterial stand out 9 April Printed material goes from stiff to soft and back again.
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Research Shape memory polymers get a grip 6 March Controlled curling — a new way to go from flat to 3D. Load more articles. No comments yet. Have your say You're not signed in. To link your comment to your profile, sign in now. Only registered users can comment on this article. We successfully demonstrate enzymatic recovery using bulk enzymatic degradation experiments and show that shape recovery is achieved by degradation of the shape-fixing phase.
Thermally actuated shape-memory polymers: Experiments, theory, and numerical simulations
We further show that both the materials and the process of enzymatic shape recovery are cytocompatible. This new shape memory polymer design can be anticipated to enable new applications in basic and applied materials science as a stimulus responsive material. Published by Elsevier Ltd. All rights reserved.
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Shape-memory polymers SMPs are widely employed in aerospace, biomedical, portable electronic devices, etc. In order to avoid the failure of the SMPs before shape change, it is critical to possess excellent mechanical properties along with their inherent shape-memory ability.
Recent research reports highlight the importance of SMPs with high strength and toughness. Conventional mechanical testing procedures such as tensile, bending, and fracture toughness are used to outline the static mechanical performance of SMPs.
Shape-Memory Polymers | Andreas Lendlein | Springer
The cyclic mechanical testing facilitates the evaluation of shape-memory parameters such as shape fixity R f and shape recovery R r ratio. In a recent development, nanoindentation technique is used to probe the shape-memory process at nanolevel. Biodegradable shape-memory polymers BSMP have arisen as highly promising materials for biomedical applications due to their valuable properties.
Their chemical and structural diversities, low toxicity, biodegradation, and resorption added to their capability to adapt their shape due to their shape-memory property make them excellent materials for many implantable devices. In this chapter, the main characteristics of these materials and their applications in biomedicine are described.
Shape Memory Polymers, Blends and Composites
The polymeric shape-memory materials, which generally trigger the shape-memory effect SME via direct heating, have been the rising star in the field of smart materials. Recently, numerous efforts have been paid to explore the alternative methods for realizing SME by indirect actuation, for further extending the practical application.
Herein, the novel functions of the shape-memory polymers, polymer blends, and composites including optical, electrical, and magnetic properties will be introduced. Moreover, the operative mechanism and optimization method of the different properties will be substantially discussed considering the composition change, morphology control, and structure design as well as the filler type, concentration, and dispersion. Finally, an outlook is presented describing the future challenges of this promising field.
Shape memory polymers experience stress-induced macromolecular reorganization like alignment, crystallization, isotropic-to-smectic order, and temperature-induced melting disorder , crystallization ordering. Hence, there is a need to apply suitable multi-scale characterization techniques to assess the molecular changes occurring during shape memory events.
This chapter focuses on the application of wide-angle and small-angle X-ray scattering WAXS and SAXS, respectively , small-angle light scattering SALS and optical microscopy techniques which are ideal to get insights into the molecular mechanisms associated to shape memory in polymers. These techniques are ideally suited to enable in situ and time - resolved studies. The main body of the chapter focused on fundamentals of X-ray scattering, recording techniques, and applications to the study of shape memory polymers using conventional X-ray sources and synchrotron radiation.
These techniques combined with temperature or uniaxial testing are also a powerful tool to understand molecular mechanisms associated to shape memory behavior. SMPs and SMPCs are a new class of stimuli-responsive smart materials that change their configuration reacting to specific external stimulus and remember the original shape.
They are expected to have interesting applications in many engineering fields such as aerospace e. This is mainly due to their lightweight, high shape reconfiguration, recovery force, good manufacturability, easily tailorable glass transition temperature, and low cost. After a brief description of SMPs, blends and their composites behavior, this chapter highlights the most attractive current and future applications.