Tag: M.W=400-500

Tian, Hongmiao published the artcileAn electrically active gecko-effect soft gripper under a low voltage by mimicking gecko’s adhesive structures and toe muscles, HPLC of Formula: 7575-23-7, the main research area is liquid crystal elastomer film mimicking gecko adhesive structure toe.

With the combination of the passive adhesion generated by micro/nano-structures at their feet and the active mech. stimulus of their toe muscles, geckos can stably walk on vertical walls and horizontal ceilings. Inspired by such stimuli-responsive systems in nature, an active adhesive soft gripper stimulated by low voltage (usually ≤6 V), consisting of a passive mushroom-like adhesive structure and an elec. active liquid crystal elastomer working as toe muscles, is proposed in this study. Through voltage on/off switching, reversible deformation can be generated for switchable adhesion, where high adhesion can be achieved under the action of a preload force accompanied by a 0 V voltage and low adhesion can be obtained under an exerted voltage. This gecko-inspired soft gripper was tested and found to be successful as a transport device for gripping/releasing objects with different features, such as a glass ball, a sample bottle, and a steel weight To the best of our knowledge, the present study is the first to propose an elec. active gecko-inspired soft gripper for transferring objects with different surfaces by the control of low voltage, processing great application potential in industrial lines and daily life and providing a novel perspective on soft gripper design.

Soft Matter published new progress about Adhesion, physical. 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

Dobson, Adam L. published the artcileCombined Dynamic Network and Filler Interface Approach for Improved Adhesion and Toughness in Pressure-Sensitive Adhesives, Category: alcohols-buliding-blocks, the main research area is network filler adhesion toughness pressure sensitive adhesive; adhesive; covalent adaptable network; dynamic covalent chemistry; fatigue; pressure-sensitive adhesive; toughness.

Of importance for adhesive materials, particularly pressure-sensitive adhesive (PSA) systems, is the ability to increase bulk toughness without reduction of adhesion. Previous approaches for increasing PSA durability sacrifice permanent crosslinking or adhesive potential, limiting performance. In this work, covalent adaptable networks (CANs) derived from thiol-thioester exchange (TTE) are utilized as a basis for adhesive films. Tensile and single-lap shear tests were conducted for adhesive materials containing no filler, 15 weight % nanoparticles functionalized with thioester-containing acrylate, or 15 weight % nanoparticles functionalized with nonthioester-containing acrylate. Addnl., fatigue experiments were conducted on unfilled adhesives. Results indicate that TTE improves toughness, adhesion, and fatigue in unfilled materials. Filled adhesives with activated TTE showed a nearly fourfold increase in adhesion with slightly reduced toughness compared to uncatalyzed filled specimens. This work has implications in many industries, from biomedical to automotive, as toughness and fatigue resistance are important considerations for adhesive applications.

ACS Applied Polymer Materials published new progress about Adhesion, physical. 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

Qiu, Haoyi published the artcilePolydimethylsiloxane Microdomains Formation at the Polythiourethane/Air Interface and Its Influence on Barnacle Release, Related Products of alcohols-buliding-blocks, the main research area is polydimethylsiloxane microdomain polythiourethane air interface barnacle; barnacle adhesion; fouling-release coating; phase separation; polydimethylsiloxane microdomains; polythiourethane; tetrapodal shaped ZnO.

In this study, polydimethylsiloxane (PDMS)/polythiourethane (PTU) composite reinforced with tetrapodal shaped micro-nano ZnO particles (t-ZnO) was successfully produced by a versatile, industrially applicable polymer blending process. On the surface of this composite, PDMS is distributed in the form of microdomains embedded in a PTU matrix. The composite inherited not only good mech. properties originating from PTU but also promising fouling-release (FR) properties due to the presence of PDMS on the surface. It was shown that the preferential segregation of PDMS domains at the polymer/air interface could be attributed to the difference in the surface free energy of PDMS and PTU. The PDMS microdomains at the PTU/air interface significantly reduced the barnacle adhesion strength on the composite. Both the pseudo- and natural barnacle adhesion strength on the composite was approx. 0.1 MPa, similar to that on pure PDMS. The pseudo-barnacle adhesion on reference surfaces AlMg3 and PTU reached approx. 4 and 6 MPa, resp. Natural barnacles could not be removed intact from AlMg3 and PTU surfaces without breaking the shell, indicating that the adhesion strength was higher than the mech. strength of a barnacle shell (approx. 0.4 MPa). The integrity of PDMS microdomains was maintained after 12 mo of immersion in seawater and barnacle removal. No surface deteriorations were found. In short, the composite showed excellent potential as a long-term stable FR coating for marine applications.

ACS Applied Materials & Interfaces published new progress about Adhesion, physical. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Related Products of alcohols-buliding-blocks.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Oh, Yuree published the artcileDual Cross-Linked, Polymer Thermosets: Modular Design, Reversible Transformation, and Triggered Debonding, Related Products of alcohols-buliding-blocks, the main research area is polymer thermoset modular design transformation triggered debonding.

We demonstrated the modular synthesis of polymer thermosets exhibiting programmed responses that arise from two predesigned functional units: a reversible crosslinker and a self-immolative linker. The former unit contains a 1,2,3-triazolium moiety that provides the crosslinked network but undergoes dynamic covalent bond exchange via transalkylation, while the latter phenyl-based unit generates a signal-specific elimination reaction that promotes selective de-crosslinking of the entire network. The two units form a functional, dual crosslinked structure after thiol-ene click polymerization followed by a thermal curing reaction, allowing large-scale synthesis. By changing the ratio of functional units, the physicochem. properties of the materials during polymerization can be finely tuned, and adequate combinations result in tailored thermosets that are reversible yet removable. Thus, we were able to reuse the thermosets in bulk, solid state, or restructure without overall structural collapse. Furthermore, by exploiting the designed nature, the materials can be used as a stimuli-responsive adhesive. We observed a high adhesive strength when gluing glass pieces and rejoined them upon heating after they were detached by force. However, exposure to a mol. signal significantly diminished the adhesion under benign conditions, and the joint was easily and irreversibly separated The design concept and materials presented herein elucidate or advance the chem. concepts for the recycling and disposal of com. thermosetting plastics when they are no longer needed.

Chemistry of Materials published new progress about Adhesion, physical. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Related Products of alcohols-buliding-blocks.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Jedrzejczyk, Monika A. published the artcileRenewable Thiol-yne “”Click”” Networks Based on Propargylated Lignin for Adhesive Resin Applications, Related Products of alcohols-buliding-blocks, the main research area is renewable thiolyne click network propargylated lignin adhesive resin.

In this study, the development of lignin-based resins for wood adhesion applications was demonstrated. We investigated two lignin fractions: com. Protobind 1000 lignin and methanol-soluble Protobind 1000 lignin fraction after mild solvolysis. Although lignin has previously been incorporated into various crosslinked systems, this is the first report on lignin-based thermosets obtained via thiol-yne “”click”” chem. In this approach, lignin was functionalized with terminal alkyne groups followed by crosslinking with a multifunctional thiol, resulting in polymeric network formation. The influence of the curing conditions on the resin characteristics and performance was studied, by varying the amount of reactive monomeric diluents. Addnl., a post-curing strategy utilizing the Claisen rearrangement was investigated. These resins were tested as a wood adhesive and were proven to possess a desirable performance, comparable to the state-of-art phenol-formaldehyde resins. Lignin-based thiol-yne resins turn out to be an alternative to phenol-formaldehyde resins, currently used as adhesives and coatings. Although it is possible to use lignin in phenol-formaldehyde resins, lignin addition is compromising the resin’s performance. The main benefits over the phenol-formaldehyde approach are that higher lignin loadings are possible to achieve, and no volatiles are emitted during the resin processing and use.

ACS Applied Polymer Materials published new progress about Adhesion, physical. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Related Products of alcohols-buliding-blocks.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Wang, Shuxue published the artcileDesign of Double-Network Click-Gels for Self-Contained Underwater Adhesion and Energy-Wise Applications in Floating Photovoltaics, Computed Properties of 7575-23-7, the main research area is click gel adhesive floating photovoltaic adhesion.

Facile fabrication of rapid, firm, and reversible underwater adhesion used on different adherets is challenging but is of primary importance for many industrial and biomedical applications. Herein, tough, stretchy, moldable, and semitransparent gels are developed for self-contained underwater adhesives. The selected structural components, well-defined double-network (DN) structures, and one-pot synthesis realize synergistic adhesion and cohesion engineering, which deliver instant, solid, reversible, and long-term adhesives with a high underwater adhesion strength of over 0.84 MPa. The underwater adhesion strength is among the best-performing tape-type underwater adhesives. In order to develop new energy-related applications for underwater adhesion, the first example of combining underwater adhesion with solar power applications is demonstrated. Taking the benefits of the direct-contact design at the air/water interface, the click-gel-mounted floating photovoltaic (FPV) system significantly increases the power conversion efficiency by 20% due to the enhanced active cooling effects, surpassing several conventional photovoltaic technologies on both land and water. The click-gel also rapidly responds to several oscillatory motions on the FPV platform. This study shines a light on the facile fabrication of DN click-gels for underwater adhesives and provides their future perspectives in energy-wise, low-maintenance, and stimuli-responsive applications.

Advanced Functional Materials published new progress about Adhesion, physical. 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

Michel, Raphael published the artcileHydrogel-Tissue Adhesion Using Blood Coagulation Induced by Silica Nanoparticle Coatings, Category: alcohols-buliding-blocks, the main research area is hydrogel nanoparticle coating process hemostasis Blood Coagulation adhesion; bioadhesion; coating; hemostasis; hydrogel; nanoparticle.

The fixation of hydrogels to biol. tissues is a major challenge conditioning the development of implants and surgical techniques. Here, coatings of procoagulant nanoparticles are devised which use the presence of blood to create adhesion between hydrogels and soft internal organs. Those nanostructured coatings are simply adsorbed at the hydrogel surfaces and can rapidly activate the formation of an interfacial blood clot acting as an adhesive joint. This concept is demonstrated on pig liver capsules with model poly(ethylene-glycol) membranes that are intrinsically poorly adhesive. In the absence of blood, ex vivo peeling tests show that coatings with aggregates of bare silica nanoparticles induce a 2- to 4-fold increase in adhesion energy as compared to the uncoated membrane (3 ± 2 J m-2). This effect is found to scale with the sp. surface area of the coating. The highest adhesion energies produced by these nanoparticle-coated membranes (10 ± 5 J m-2) approach the value obtained with cyanoacrylate glue (33 ± 11 J m-2) for which tearing of the tissue is observed Ex vivo pull-off tests show an adhesion strength of coated membranes around 5 ± 1 kPa, which is significantly reduced when operating in vivo (1.0 ± 0.5 kPa). Nevertheless, when blood is introduced at the interface, the in vivo adhesion strength can be improved remarkably with silica coatings, reaching 4 ± 2 kPa after 40 min contact. In addition, these silica-coated membranes can seal and stop the bleeding produced by liver biopsies very rapidly (<30 s). Such a combination of coagulation and particle bridging opens promising routes for better biointegrated hydrogel implants and improved surgical adhesives, hemostats, and sealants. ACS Applied Bio Materials published new progress about Adhesion, physical. 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

Qiu, Haoyi published the artcilePreventing algae adhesion using lubricant-modified polydimethylsiloxane/polythiourethane nanocomposite, Application In Synthesis of 7575-23-7, the main research area is polydimethylsiloxane polythiourethane nanocomposite algae adhesion lubricant.

To meet the need for an environmentally friendly fouling-release coating with high mech. strength and good adhesion to substrates, a four-component nanocomposite was developed by a simple and industrially applicable blending approach. The nanocomposite consists of mech. stable matrix polythiourethane (PTU), 1 wt% low surface free energy and rubber-like polydimethylsiloxane (PDMS), 1 wt% lubricant silicone oil, and 1 wt% tetrapodal shaped micro-nano ZnO (t-ZnO) filler particles, hereafter named PPZO. The rubber-like PDMS formed microdomains at the PTU/air interface, while silicone oil was distributed between the PDMS microdomains. The tensile strength of PPZO nanocomposite was approx. 63 MPa, two to four hundred times higher than the tensile strength of previously reported oil-modified coatings. The adhesion strength of PPZO to the substrate was 30 times higher than that of pure PDMS. After a five-month dynamic field test, the PPZO surface revealed much less biofouling than the references (AlMg3 and PTU), confirming its long-term biofouling control property. The attached algae on PPZO could easily and completely be removed by gentle brush cleaning. The good biofouling control property of PPZO can be attributed to the increased water repellency (signified by the increased water contact angle) and the surface slippage by silicone oil incorporation.

Materials & Design published new progress about Adhesion, physical. 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

Lin, Xiong published the artcileEngineering the Properties of Transparent Hybrid Coating toward High Hardness, Excellent Flexibility, and Multifunction, Quality Control of 7575-23-7, the main research area is engineering transparent hybrid coating hardness excellent flexibility multifunction; coatings; flexible yet hard; functionality; hybrid nanocomposites; polyhedral oligomeric silsesquioxane (POSS).

Transparent functional coatings with glass-like hardness and polymer-like flexibility are highly desirable for flexible and foldable displays. Although several coatings have been developed toward this goal, achieving a functional coating with 9H pencil hardness and extremely low bending radius of curvature (rc) remains a great challenge due to the inherent conflict between hardness and flexibility. To overcome this trade-off, a facile strategy is developed herein. The coating is an organic-inorganic hybrid nanocomposite that is prepared from thiol-acrylate polymerization of acrylo polyhedral oligomeric silsesquioxane and multifunctional thiols. The former provides the desired hardness, while the latter affords high flexibility and the maximum level of chem. bonding for organic-inorganic phases. Because of the good miscibility and varied functionality of monomers, we are able to manipulate the composition and internal structure of coating systematically, endowing it with high transparency (98%, 550 nm), super hardness (9H), excellent low modulus (1.85 GPa, the most flexible one to date), and the ability to withstand steel wool’s abrasion and repeated bending (rc = 0.8 mm) 10 000 times on PET film. On the final coating, both antifouling and antibacterial abilities are integrated without sacrificing its other properties after postfunctionalizing a zwitterionic layer. This work balances the hardness-flexibility conflict effectively and provides some useful protective coatings for next-generation displays.

ACS Applied Materials & Interfaces published new progress about Adhesion, physical. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Quality Control of 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Jedrzejczyk, Monika A. published the artcilePreparation of Renewable Thiol-Yne “”Click”” Networks Based on Fractionated Lignin for Anticorrosive Protective Film Applications, Synthetic Route of 7575-23-7, the main research area is fractionated lignin thiol yne click chem anticorrosive protective film.

The synthesis of novel, renewable lignin-based protective films with anticorrosive properties is presented in this work. Thermosetting films are prepared by means of tandem UV-initiated thiol-yne “”click”” synthesis and Claisen rearrangement strategy. These films contain high lignin loading, 46-61%, originating from a nickel-catalyzed birch wood reductive catalytic fractionation (RCF) process. Lignin fractions with varying monomer content are compared before resins preparation, namely a mixture of monomers and oligomers without fractionation, or after fractionation via extraction and membrane separation This study aims to determine if the separation of lignin monomers and oligomers is necessary for the application as a thermosetting resin. The resulting films exhibit remarkable adhesion to a metal surface and excellent solvent resistance, even after exposure to a corrosive environment. Moreover, those films show superior barrier properties, studied with odd random phase electrochem. impedance spectroscopy (ORP EIS). After 21 days of exposure, the examined films still show impressive high corrosion protection with the low-frequency impedance ≈1010 Ω cm2 and capacitive behavior. This work demonstrates an interesting proof-of-concept where laborious, costly, and energy-intensive separation of the depolymerized lignin mixture of monomers and oligomers is not necessary for the successful resin synthesis with excellent properties using the applied synthetic strategy.

Macromolecular Chemistry and Physics published new progress about Adhesion, physical. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Synthetic Route of 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts