
4D printing extends fabrication additive by integrating time-dependent shape transformation through stimuli-responsive materials such as shape memory polymers, hydrogels, and self-assembling composites. This domain focuses on the design, fabrication, and control of structures capable of programmed morphological changes triggered by environmental factors including temperature, moisture, light, and magnetic fields. Research advances address material formulation, multi-material printing techniques, actuation mechanisms, and predictive modeling of dynamic behaviors. The following compilation presents recent publications and patented innovations highlighting developments in 4D printing materials, fabrication processes, application-specific designs, and functional performance optimization across fields such as soft robotics, biomedical devices, and aerospace engineering.
Among the sodium polyacrylate uses studied for shape-changing hydrogels is water-driven swelling, and researchers also ask whether a sodium polyacrylate biodegradable grade could be developed for such devices.
Voici notre dernière sélection de publications et de brevets internationaux en anglais sur l'impression 4D, issus de nombreuses revues scientifiques en ligne, classés et axés sur l'impression 4D, les matériaux sensibles aux stimuli, les polymères à mémoire de forme, les structures auto-assemblées, la matière programmable, les actionneurs imprimés en 4D, l'impression cinétique 4D, les matériaux intelligents, la conception pour l'impression 4D, la fabrication pour l'impression 4D, les structures morphologiques imprimées en 4D, la transformation de forme imprimée en 4D, la réponse thermique de l'impression 4D, l'impression 4D, les matériaux photosensibles, la réponse magnétique de l'impression 4D, les actionneurs hydrogel, le comportement dépendant du temps et le déclenchement environnemental.
Listening device with smart material indication of listening state
Patent published on the 2026-10-28 in EP under Ref EP4832504 by BANG & OLUFSEN AS [DK] (Magnussen Magnus SØgaard [dk], Francombe Jon [dk])
Abstract: Aspects provide a wearable audio device. The wearable audio device includes a smart material configured to change a level of optical transparency in response to a signal. The wearable audio device includes one or more transducers configured to produce sound. The wearable audio device includes one or more processors configured to control the signal to change the level of optical transparency of the smart material.[...]
Our summary: The device is a wearable audio unit that utilizes smart material to indicate listening status. It features transducers for sound production and processors to control the optical transparency of the material. The smart material s transparency changes in response to a signal, enhancing user interaction.
wearable audio device, smart material, optical transparency, transducers
Patent
Connecting element for a pipe section made of shape memory polymer, pipe conduit connection comprising said connecting element and method for connecti
Patent published on the 2026-10-28 in EP under Ref EP4831527 by UPONOR INNOVATION AB [SE] (Cota Timothy [us])
Abstract: [0001] To further develop a connecting element (100; 102) for a pipe section made of shape memory polymer and comprising - a cylindrical male connector designed to fit inside the pipe, wherein the cylindrical male connector comprises a circumferential mechanical retaining flange extending outward beyond the male connector s circumference to secure the connecting element (100; 102) to the pipe section, and - a circumferential, resilient sealing element extending outward and being designed to crea[...]
Our summary: The invention describes a connecting element for a pipe section made of shape memory polymer. It features a cylindrical male connector with a mechanical retaining flange and a resilient sealing element. The design allows for an efficient and fluid-tight connection between pipe sections.
shape memory polymer, pipe connection, mechanical retaining flange, sealing element
Patent
Two-way shape memory polymer applications
Patent published on the 2026-10-21 in EP under Ref EP4826146 by HELMHOLTZ ZENTRUM HEREON GMBH [DE] (Farhan Muhammad [de], Izraylit Victor [de], Herrmann Sarai [de])
Abstract: The present invention relates to the field of textiles, especially shape memory textiles and discloses a two-way shape memory polymeric textile and the covered two-way shape memory polymeric fiber comprised therein, a method and applications thereof.[...]
Our summary: This invention focuses on two-way shape memory polymers in textiles. It describes a specific two-way shape memory polymeric textile and its fiber. The document outlines methods and potential applications of these materials.
shape memory polymer, textiles, two-way applications, polymeric fiber
Patent
Bio-assimilation master batch composition, processes for producing polymeric bioassimilating material therefrom, and products produced therefrom
Patent published on the 2026-08-13 in US under Ref US20260234367 by SMART PLASTIC TECH LLC [US] (Stephens Michael [gb], Peksenar Yaman [us])
Abstract: [0000] A masterbatch composition comprises: a first oxidation-promoting agent, such as manganese stearate or manganese carboxylate, present in an amount sufficient to initiate a slow, delayed oxidative response, thereby establishing a first phase induction profile; and a second oxidation-promoting agent, such as cobalt stearate or cobalt carboxylate, present in a secondary or sequestered form (chelated), configured to activate only after a defined induction period or environmental trigger, such [...]
Our summary: A masterbatch composition includes a first and second oxidation-promoting agent to control oxidative responses. The first agent initiates a delayed oxidative response, while the second activates after specific triggers. This process produces polymeric bio-assimilating materials with defined characteristics.
bio-assimilation, masterbatch composition, oxidation-promoting agents, polymeric materials
Patent
Dimensionality and confinement reshape competition in cellular renewing active matter
Published on 2026-08-12 by Patrick Zimmer, Philip Bittihn and Yoav G Pollack @IOP SCIENCE
Abstract: Cellular renewing active matter—assemblies of proliferating and apoptotic cells—underlies tissue homeostasis, morphogenesis, and clonal competition. Previous work in one-dimensional periodic systems identified a fitness advantage associated with rapid dead-cell clearance, an ‘opportunistic’ competition mechanism. Extending this framework, we study two-dimensional cellular aggregates and show that dimensionality modifies the interplay between competition mechanisms for clones with differe[...]
Our summary: This study examines how dimensionality and confinement affect competition in cellular renewing active matter. It reveals that in two-dimensional aggregates, opportunistic and homeostatic-pressure-based competition interact differently compared to one-dimensional systems. The introduction of circular confinement alters competitive outcomes by promoting spatially heterogeneous pressures and affecting cell behavior at boundaries.
dimensionality, active matter, competition mechanisms, cellular aggregates
Publication
Wireless trip mechanism based sensors
Patent published on the 2026-07-09 in WO under Ref WO2026148271 by WEPOWER TECH LLC [US] (Riddell Michael Joseph [us], Andle Jeffrey Charles [us])
Abstract: Sensors and sensor assemblies are provided that include a housing, at least one circuit board assembly provided within the housing, wherein the at least one circuit board assembly includes electrical contacts, a power supply provided within the housing, a lever movable between a loaded position and a tripped position, wherein the lever is operatively coupled to the power supply and includes an electrical contact bridge and a spring arranged to bias the lever to the tripped position, and a stimul[...]
Our summary: The technology involves wireless sensors with a housing containing a circuit board assembly and a power supply. A lever, influenced by a stimuli-responsive material, transitions between loaded and tripped positions. Upon tripping, the lever activates the circuit board assembly to send signals to an external device.
wireless sensors, trip mechanism, circuit board assembly, stimuli-responsive material
Patent
Enhancing Shape Recovery and Mechanical Properties of Bisphenol-A-Epoxy-Based Shape Memory Polymer Composites (SMPCs) Using Amine Curing Agent Blends
Published on 2026-01-30 by Garam Do, Sungwoong Choi, Seongeun Jang, Duyoung Choi @MDPI
Abstract: Shape memory polymer (SMP) has broad applications in various industries, including automotive, aerospace, and medical, as it can maintain a given shape and return to its original form upon exposure to external stimuli such as heat, magnetic fields, or light. However, the intrinsic limitation of epoxy results in the low thermal conductivity of SMP, which reduces the difference in temperature (ΔT) between the glass transition temperature (Tg) and the actuation temperature, thereby ne[...]
Our summary: This study investigates the enhancement of shape recovery and mechanical properties of Bisphenol-A-epoxy-based shape memory polymer composites using amine curing agent blends. The research shows that optimal filler content and improved dispersion of carbon-based fillers significantly enhance the performance of the composites. Results indicate a notable improvement in shape recovery time and mechanical strength.
Shape Memory Polymer, Amine Curing Agents, Thermal Stability, Mechanical Properties
Publication
Advances in Modular Synthesis, Responsive Design, and Multifaceted Applications
Published on 2026-01-26 by Akhil Sharma, Monu Sharma, Sonu Sharma, Vikas Sharma, Shivika Sharma, Iyyakkannu Sivanesan @MDPI
Abstract: The recent development in polymer science has gone beyond the traditional linear and randomly functionalizable macromolecules to the architected polymer systems, which integrate modular synthesis and dynamic responsiveness. Although the literature related to polymer synthesis and stimuli-responsive materials and applications is widely discussed, it is common to review the aspects independently, restricting a complete picture of how architectural modularity controls adaptive performance. This gap[...]
Our summary: This review integrates modular polymer synthesis with stimuli-responsive design. It highlights the importance of structural precision in determining polymer performance. The framework aims to advance the development of multifunctional and environmentally friendly polymer systems for real-world applications.
Modular Synthesis, Responsive Design, Polymer Science, Multifunctional Applications
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