Tag: M.W=400-500

Wang, Meng published the artcileLiquid Crystal Elastomer Electric Locomotives, Category: alcohols-buliding-blocks, the main research area is liquid crystal elastomer elec locomotive.

In this letter, we present an electro-driven cylindrical actuator system composed of a bilayered liquid crystal elastomer/carbon black (LCE/CB) electro-driven soft actuator and a conductive track. The bilayered LCE/CB electro-driven actuator consists of an inner LCE circular band and several U-shaped CB conductive regions stuck on the outer surface of the LCE ring. Benefiting from the effective Joule heating of CB powder and the consequential inhomogeneous stress generated inside the bilayered LCE/CB film, the cylindrical actuator can roll forward with a rate of 1.6 mm/s along a stationary copper conductive track powered by a 50 V d.c. supply. The dynamic connection between the rolling actuator and the conductive track effectively eliminates the limitation of elec. wires in the complicated actuation set-ups of the LCE materials. This work might promote the development of electro-driven LCE actuators and have potential applications in the fields of soft robots and elec. devices.

ACS Macro Letters published new progress about Actuators. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Category: alcohols-buliding-blocks.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Zhang, Pei published the artcile4D Chiral Photonic Actuators with Switchable Hyper-Reflectivity, Application In Synthesis of 7575-23-7, the main research area is chiral photonic actuator switchable hyper reflectivity.

Cholesteric liquid crystals (CLCs) are chiral photonic materials reflecting only circularly polarized light with the same handedness as the helical polymer structure. Concurrent shape and color changes can be achieved using CLCs, but the fabrication of CLCs with switchable 3D shape, structural color, and hyper-reflectivity, i.e., reflecting both left- and right-handed circularly polarized light simultaneously, has not yet been achieved. Here, CLC elastomer (CLCE) actuators are reported to reflect equal amounts of left- and right-handed circularly polarized light. Hyper-reflectivity is achieved by uniaxially stretching the partially crosslinked film to induce helix deformation which is then fully crosslinked to fix the deformed helical structure. The shape, structural color, and hyper-reflectivity of the polymer film are switchable with temperature At high temperatures, only right-handed circularly polarized light is reflected and the color is red shifted. The film can be shaped in three dimensions: a structural colored 3D shaped beetle is fabricated using molding, which reflects both left- and right-handed circularly polarized light and shows reversible, temperature responsive structural color and 3D shape changes. Hence, 4D engineered bioinspired multifunctional materials are fabricated, which are interesting for applications ranging from sensing actuators to switchable hyper-reflective films and objects.

Advanced Functional Materials published new progress about Actuators. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Application In Synthesis of 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Zhao, Tonghui published the artcileHelical Liquid Crystal Elastomer Miniature Robot with Photocontrolled Locomotion, Product Details of C17H28O8S4, the main research area is liquid crystal elastomer soft robot photomobility.

Miniature liquid crystal elastomer (LCE) based soft robots with multidirectional locomotion ability and multifunctionality have captured the extensive interest of researchers for a wide range of potential applications. Generally, the subsistent actuation modes for most LCE soft robots present several simple shape-changing under external stimuli. Although elaborately designed for complicated structures, they still achieve limited mobility, restricting the practical applications severely. Herein, a photo-controllable helical soft robot (PHSR) prepared with near-IR (NIR) light active LCE is reported. The 3D helical architecture of PHSR is constructed by manually twisting the LCE strip. The irradiation of NIR light transforms the basic reversible shape deformations (shrinking/elongating, winding/unwinding, and bending) of PHSR to macroscopic photomobility. As the torsional orientation of mesogens generated by manually twisting process, the rolling direction can be controlled by the scanning direction of the NIR spot. The flexible steering motion is in favor of performing various tasks such as traversing gap, climbing, and outputting mech. work, suggesting that PHSR with directional photomobility and multifunction can be extended to a variety of applications.

Advanced Materials Technologies (Weinheim, Germany) published new progress about Actuators. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Product Details of C17H28O8S4.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Merkel, Daniel R. published the artcileMechanical energy dissipation in polydomain nematic liquid crystal elastomers in response to oscillating loading, Recommanded Product: Pentaerythritol tetra(3-mercaptopropionate), the main research area is nematic liquid crystal elastomer oscillating loading; polyester polythioether rubber nematic oscillating loading actuator.

Liquid crystal elastomers (LCEs) exhibit exotic mech. behaviors such as reversible actuation, elevated loss tangent above the glass transition, and soft elasticity; however, LCEs have yet to be thoroughly investigated under high-strain cyclic loading. This study explores a main-chain polydomain nematic elastomer synthesized from a thiol-acrylate Michael-addition reaction in the nematic state. Low-strain (i.e., <0.2%) dynamic mech. anal. and creep behavior was used to help link viscoelasticity and mesogen reorientation to high-strain cyclic loading. Specifically, the behavior was compared at discrete temperatures below the glass transition, in the nematic-rubbery regime, and in the isotropic-rubbery regime. Creep behavior in the nematic-rubbery regime was modeled using two characteristic relaxation times, which decreased with increasing temperature (τ1, τ2 (19 °C) = 140 s, 16 s, and τ1, τ2 (62 °C) = 2.4 s, 0.6 s). Samples were repeatedly loaded to 50 kPa at 5 cycles/min at each temperature for 350 cycles. In the rubbery nematic state at 62 °C, low threshold stress and short relaxation times allowed reversible domain reorientation between each cycle, resulting in a repeatable stress-strain curve with high hysteresis (220 kJ/m3). In contrast, the 19 °C and 39 °C conditions in the rubbery nematic state demonstrated ratcheting behavior in response to cyclic loading, which lowered the hysteresis values with increased cycling. The findings presented here represent the first investigation into mech. energy dissipation in main-chain nematic LCEs under large oscillating stress conditions. Overall, this study helps to better understand the role LCEs can play in energy dissipating applications with high values of strain and varying temperature Polymer published new progress about Actuators. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Recommanded Product: Pentaerythritol tetra(3-mercaptopropionate).

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Russo, C. published the artcileShape-memory actuators based on dual-curing thiol-acrylate-epoxy thermosets, HPLC of Formula: 7575-23-7, the main research area is thiol epoxy acrylate thermoset preparation actuator mech thermal property.

In this work, new shape-memory thermosets were developed using a thiol-acrylate-epoxy dual-curing system. A previously studied system has been successfully modified, introducing different amounts of tri(2,3-epoxypropyl)isocyanurate (ISO) and bisphenol A glycerolate (1 glycerol/phenol) diacrylate (BAGA) in order to enhance the thermomech. properties and the glass transition temperature of the final materials. Preliminary studies on the curing process proved that the curing process is not affected, and the critical ratio remains unchanged. Glass transition temperatures and thermomech. properties were successfully improved, extending the applicability of these thermosets to the field of soft-actuator. Shape-memory behavior was comprehensively investigated in unconstrained, fully and partially constrained conditions. Unconstrained experiment results showed excellent shape fixation and recovery, coupled with a fast recovery process. On the other hand, fully and partially constrained recovery experiments evidenced optimal performances obtained by the combination of both high crosslinking d. and high deformability in the programming stage. Considerably high values of recovery stress (up to 7 MPa) and work output (up to 1300 kJ/m3) were found confirming the high potentiality of these dual-cured thermosets in the field of soft-actuation.

eXPRESS Polymer Letters published new progress about Actuators. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, HPLC of Formula: 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Ford, Michael J. published the artcileSize of liquid metal particles influences actuation properties of a liquid crystal elastomer composite, Category: alcohols-buliding-blocks, the main research area is metal particle actuation property liquid crystal elastomer composite.

Composites of liquid crystal elastomer (LCE) that are elec. conductive have the potential to function as soft “”artificial muscle”” actuators that can be reversibly stimulated with elec. Joule-heating. Conductivity can be achieved by embedding the LCE with droplets of an alloy of gallium and indium that is liquid at room temperature These soft artificial muscles are capable of >50% reversible actuation with an applied load. The key to actuation at high loadings of liquid metal (LM) is that the droplets deform with the surrounding matrix. By controlling the size of LM droplets through simple processing techniques, we show that the actuator properties of the LM-LCE muscle can be tuned. For example, composites with smaller liquid metal particles (ca. 10μm or less) are stiffer than those with larger liquid metal particles (ca. >100μm) and are capable of greater force output. However, smaller particles reduce actuation strain and composites with large particles exhibit significantly greater stroke length. Such tunability in actuation properties permits the fabrication of specialized soft artificial muscles, where processing of the composite controls actuation strain and actuation force.

Soft Matter published new progress about Actuators. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Category: alcohols-buliding-blocks.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Ford, Michael J. published the artcileA multifunctional shape-morphing elastomer with liquid metal inclusions, Recommanded Product: Pentaerythritol tetra(3-mercaptopropionate), the main research area is liquid crystal elastomer metal composite thermal elec mech property; conductive elastomer; liquid crystal elastomer; liquid metal; shape memory; soft actuator.

Natural soft tissue achieves a rich variety of functionality through a hierarchy of mol., microscale, and mesoscale structures and ordering. Inspired by such architectures, we introduce a soft, multifunctional composite capable of a unique combination of sensing, mech. robust electronic connectivity, and active shape morphing. The material is composed of a compliant and deformable liquid crystal elastomer (LCE) matrix that can achieve macroscopic shape change through a liquid crystal phase transition. The matrix is dispersed with liquid metal (LM) microparticles that are used to tailor the thermal and elec. conductivity of the LCE without detrimentally altering its mech. or shape-morphing properties. Demonstrations of this composite for sensing, actuation, circuitry, and soft robot locomotion suggest the potential for versatile, tissue-like multifunctionality.

Proceedings of the National Academy of Sciences of the United States of America published new progress about Actuators. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Recommanded Product: Pentaerythritol tetra(3-mercaptopropionate).

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Yao, Mingyue published the artcileA Highly Robust Ionotronic Fiber with Unprecedented Mechanomodulation of Ionic Conduction, Computed Properties of 7575-23-7, the main research area is ionotronic liquid crystal fiber film elastic ionic conductivity; actuators; ionic conductors; responsive materials; sensors; stretchable electronics.

Stretchable ionic conductors are appealing for tissue-like soft electronics, yet suffer from a tardy mechanoelec. response due to their poor modulation of ionic conduction arising from intrinsic homogeneous soft chain network. Here, a highly robust ionotronic fiber is designed by synergizing ionic liquid and liquid crystal elastomer with alternate rigid mesogen units and soft chain spacers, which shows an unprecedented strain-induced ionic conductivity boost (≈103 times enhanced as stretched to 2000% strain). Such a surprisingly high enhancement is attributed to the formation of microphase-separated low-tortuosity ion-conducting nanochannels guided by strain-induced emergence of aligned smectic mesophases, thus allowing for ultrafast ion transport that resembles the role of swimming lanes. Intriguingly, the boosting conductivity even reverses Pouillet’s Law-dictated resistance increase at certain strains, leading to unique waveform-discernible strain sensing. Also, the fiber retains thermal actuation properties with a maximum of 70% strain changes upon heating, and enables integrated self-perception and actuation. The findings offer a promising mol. engineering route to mech. modulate transport behavior of ionic conductors toward advanced ionotronic applications.

Advanced Materials (Weinheim, Germany) published new progress about Actuators. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Computed Properties of 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Chen, Guancong published the artcileA photo-driven metallo-supramolecular stress-free reversible shape memory polymer, Computed Properties of 7575-23-7, the main research area is photo metallo supramol stress free reversible shape memory polyester.

Soft machines can offer remote-powering mechanisms and mech. flexibility unmatched by conventional rigid machines. However, the mol. integration of powering and actuation functions in a simple yet versatile format has remained challenging. We achieve this with a semi-crystalline supramol. metallo-network. The dynamic metallo-bonds offer a flexible mechanism for programming the network anisotropy, which gives rise to stress-free reversible actuation using the crystalline transition as the actuation phase. In addition, the proper choice of metallo-bonds provides suitable photo-thermal capabilities for remote powering without endangering the cyclic actuation stability, despite the supramol. nature. Based on these principles, we illustrate that the supramol. network can be programmed into a reptile-style device remotely powered by light. The molecularly integrated dual functionality based on supramol. metallo-bonds provides an attractive option for the future design of soft machines with sophisticated morphing behaviors yet simple powering mechanisms.

Journal of Materials Chemistry A: Materials for Energy and Sustainability published new progress about Actuators. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Computed Properties of 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Chen, Ling published the artcileHealable and Rearrangeable Networks of Liquid Crystal Elastomers Enabled by Diselenide Bonds, Name: Pentaerythritol tetra(3-mercaptopropionate), the main research area is diselanediylbispropanediyl diacrylate crosslinkable liquid crystal elastomer actuator; diselenide bond; dual-mode programmability; liquid crystal elastomer; rearrangeable LCE network.

Based on liquid crystal elastomer (LCE) materials, hierarchically structured soft actuators can meet some requirements for human-friendly working mode and execute complex tasks with intelligent adaptation to environmental changes. However, few researchers have paid much attention to the preparation methods of multicomponent/hierarchical LCE actuators. The authors demonstrate the successful integration of an exchangeable diselenide chain extender for the preparation of dynamic LCEs, which could be reprogrammed on heating or under visible light illumination. Also, the rearrangeable polydiselenide networks could be applied to develop the self-welding technol. toward fabricating hierarchically structured LCE actuators with sophisticated deformability without using any auxiliary reagent (adhesive, tape, catalysts or initiator) during the assembling process.

Angewandte Chemie, International Edition published new progress about Actuators. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Name: Pentaerythritol tetra(3-mercaptopropionate).

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts