Tag: M.W=400-500

Beyer, Valentin Peter published the artcileThiol-Bromo Click Reaction for One-Pot Synthesis of Star-Shaped Polymers, Product Details of C17H28O8S4, the main research area is thiol bromo click star shaped polymer; Cu-mediated RDRP; Star polymers; click reactions; one pot reactions; thiol-bromo.

Star-shaped polymers have unique phys. properties and they are sought after materials in industry. However, the ease of synthesis is essential for translation of these materials into large-scale applications. Herein, a highly efficient synthetic method to prepare star-shaped polymers by combination of Cu-mediated reversible deactivation radical polymerization (Cu-RDRP) and thiol-bromo click reaction is described. Well-defined linear and block polymers with a very high bromine chain end fidelity are obtained via Cu-RDRP and subsequently react with multi-functional thiol compounds High coupling efficiencies of larger than 90% are obtained owing to the quick and efficient reaction between thiols and alkyl bromides. Moreover, the arms of the obtained star-shaped polymers are linked via thioether bonds to the core, making them susceptible for oxidative degradation

Macromolecular Rapid Communications published new progress about Click chemistry. 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

Snyder, Brittany L. published the artcileDrug Delivery and Drug Efficacy from Amorphous Poly(thioether anhydrides), Product Details of C17H28O8S4, the main research area is polythioether anhydride drug delivery efficacy; drug delivery; lidocaine; poly(thioether anhydride); surface erosion.

The correlation between erosion and drug (lidocaine and 6-mercaptopurine, 6-MP) release from amorphous poly(thioether anhydrides), which are synthesized using radical-mediated thiol-ene polymerization, is reported. Cytotoxicity studies of the polymer toward human fibroblast human dermal fibroblasts adult, melanoma A-375, and breast cancer MCF-7 cells are conducted, and drug efficacy of a cancer and autoimmune disease drug (6-MP) when released from the poly(thioether anhydrides) is examined against two cancerous cell types (A-375 and MCF-7). Erosion and drug release studies reveal that lidocaine release is governed by network erosion whereas 6-MP is released by a combination of erosion and diffusion. The cytotoxicity studies show that all three cell types demonstrate high viability, thus cytocompatibility, to poly(thioether anhydrides). Toxicity to the material is dose dependent and comparable to other polyanhydride systems. The 6-MP cancer drug is shown to remain bioactive after encapsulation in the poly(thioether anhydride) matrix and the polymer does not appear to modify the efficacy of the drug.

Macromolecular Bioscience published new progress about Biocompatibility, cytocompatibility. 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

Alizadeh, Mohamad published the artcilepH-Responsive MFPTT microcapsules containing dimethyl sulfoxide: Preparation, characterization and tuning the release behavior of microcapsule contents, HPLC of Formula: 7575-23-7, the main research area is melamine formaldehyde pentaerythritol tetrakis mercaptopropionate microcapsule epoxy coating; corrosion inhibitor.

The new approach to intelligent systems is the use of stimuli-responsive micro/nanocapsules to release active ingredients. This work focuses on the preparation of melamine formaldehyde pentaerythritol tetrakis (3-mercaptopropionate) (MFPTT) microcapsules and represent a versatile platform to encapsulate active agent that release capsule contents under alk. condition. DMSO (DMSO) was selected as a solvent that can dissolve a wide range of chem. compound Exptl. results demonstrated that the properties of the capsule shell play a key role in the release rate. Permeability and release of encapsulated payloads were investigated by Field emission SEM (FESEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and UV-visible spectroscopy (UV-vis). It is found that the morphol. of capsules was affected by changing the pH-sensitive agent content. The particle size of capsules that were synthesized at different conditions were in the range of 800 to 9000 nm with a polydispersity index < 0.4. The chem. structure of capsules was investigated with Fourier-transform IR spectroscopy (FTIR), Elemental anal. (ICP) and Energy-dispersive X-ray (EDX). The shell thickness and core fraction of the microcapsules were characterized by using thermogravimetric anal. (TGA). Addnl., the performance of the release inhibitor from microcapsules in the interface of the coating/substrate characterized by electrochem. impedance spectroscopy (EIS) measurement. Progress in Organic Coatings published new progress about Anticorrosive coating materials. 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

Reisinger, David published the artcileStreamlined concept towards spatially resolved photoactivation of dynamic transesterification in vitrimeric polymers by applying thermally stable photolatent bases, Formula: C17H28O8S4, the main research area is photoactivation dynamic transesterification vitrimeric polymer thermally stable photolatent base.

Through a well-targeted design, vitrimers are able to reorganise their three-dimensional covalently crosslinked network structure by associative exchange reactions when the so-called topol. freezing transition temperature (Tv) is exceeded. Although in the past decade a vast number of vitrimers have been developed, there is only a very limited number of elaborate strategies for enabling a controlled and spatially resolved onset of the exchange reactions above Tv. Herein, we describe a convenient approach for a locally controllable photoactivation of vitrimeric properties in a covalently crosslinked thiol-epoxy network by the UV-mediated release of a strong amidine base acting as an efficient transesterification catalyst. In contrast to previous work, the applied photolatent catalysts benefit from superior solubility properties, adequate curing characteristics in the non-activated state (the addition of a supplementary catalyst is not required) and an excellent thermal stability. The spatially controlled activation of vitrimeric properties in terms of dynamic transesterification, macroscopically visible as a viscoelastic flow, is demonstrated by stress relaxation studies and a reshaping experiment Moreover, we confirm that an undesired purely thermally induced catalyst release can be entirely excluded.

Polymer Chemistry published new progress about Glass transition temperature. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Formula: C17H28O8S4.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Wang, Ben published the artcileEstimating self-healing capability of carbon fiber/epoxy composites using ultrasonic guided wave, Synthetic Route of 7575-23-7, the main research area is epoxy carbon fiber composite ultrasonic guided wave self healing.

In this work, two types of self-healing composite laminates with embedded 6 and 12 weight% microcapsules resp., were prepared The guided waves were activated and captured using piezoelec. transducer in a pitch-catch approach. Mode I interlaminar fracture tests were conducted using double cantilever beam specimens, and the effects of concentration of microcapsules on the interlaminar properties of specimens were investigated. The interlaminar fracture surfaces of self-healing specimens were observed to support the anal. of mech. tests and guided wave detecting results. The results show that the self-healing efficiency of specimens with high-concentration microcapsules is less than that of specimens with low-concentration microcapsules. Meanwhile, low-concentration microcapsules reduce the interlaminar properties of specimens. Two guided-wave parameters, namely signals peak value and waveform similarity, were set and correlated with the self-healing capability of specimens. When the specimens were damaged, the peak value of response signals decreases, and the waveform difference between the response signal and reference signal becomes larger. When the specimens were healed, the peak value of response signals rises, and the waveform difference between them becomes smaller.

Polymer Testing published new progress about Carbon fibers Role: MOA (Modifier or Additive Use), USES (Uses) (T 300). 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

Patel, Twinkal published the artcileSelf-Healable Reprocessable Triboelectric Nanogenerators Fabricated with Vitrimeric Poly(hindered Urea) Networks, SDS of cas: 7575-23-7, the main research area is self healing triboelec nanogenerator vitrimeric poly hindered urea network; dynamic bulky urea chemistry; interfacial polarization; poly(hindered urea); reprocessability; self-healing; triboelectric device.

In recent years, the advent of highly deformable and healable electronics is exciting and promising for next-generation electronic devices. In particular, self-healable triboelec. nanogenerators (SH-TENGs) serve as promising candidates based on the combination of the triboelec. effect, electrostatic induction, and self-healing action. However, the majority of SH-TENGs were devised with weak polymeric networks that are healed with reversible supramol. interactions or disulfides, thus resulting in poor mech. properties and low resistance to creeping. To address this issue, the authors demonstrate the integration of mech. strong and self-healable poly(hindered urea) (PHU) network in the fabrication of effective TENGs. The designed PHU network is flexible but shows greater mech. property of tensile strength ≤1.7 MPa at break. The network is capable of self-healing quickly and repeatedly as well as being reprocessable under mild conditions, enabling the recovery of triboelec. performances after the complete healing of the damaged surfaces. Also, the interfacial-polarization-induced enhancement of dielec. constant endows SH-TENG with the highest triboelec. output performance (169.9 V/cm2) among the reported healable TENGs. This work presents an avenue to the development of mech. energy-harvesting devices and self-powered sensors with excellent stretchability, high recoverability, and good mech. strength.

ACS Nano published new progress about Triboelectric nanogenerators. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, SDS of cas: 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Li, Chenzhe published the artcileAmplified photo-responses in sequentially polymerized azobenzene-containing polymer networks: the role of isomer interconnection, Quality Control of 7575-23-7, the main research area is azobenzene interconnected photoresponsive polymer network photoactuation thermal mech property.

Authors report a one-pot synthesis method based on two-step sequential thiol-ene reactions for the facile preparation of azobenzene-interconnected photoresponsive polymers (azo-ICPRPs). In the first step, block-length-controlled azobenzene prepolymers (azo-prepolymers) are prepared in situ in a molten reaction mixture by using the nucleophile-catalyzed chemoselective thiol-Michael reaction. In the second step, the formed azo-prepolymers are further crosslinked with UV-transparent monomers by a free radical-initiated thiol-ene “”click”” reaction, yielding a crosslinked polymer system with rubbery storage moduli (Er) ranging from 3.6 to 6.7 MPa and glass transition temperatures (Tg) ranging from 21 to 28°C. The interconnection of azobenzene moieties in azo-ICPRPs is found to greatly amplify the photo-actuation performance. Compared to single-step polymerized polymers with the same monomer composition, azo-ICPRPs with long-block-length showed up to 7 times higher photostrains, with 50 times faster kinetics. Consequently, the specific actuation work and power output during each stroke were also greatly amplified by the interconnection of azobenzene. The maximum measured specific stroke work and power output under 15 mW cm-2 UV activation were 121.3 kJ m-3 and 34 W kg-1, resp., which are comparable to those for skeletal muscles.

Polymer Chemistry 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, Quality Control of 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Ohzono, Takuya published the artcileDynamic Manipulation of Friction in Smart Textile Composites of Liquid-Crystal Elastomers, Category: alcohols-buliding-blocks, the main research area is interfacial friction nematic liquid crystal elastomer polyester smart textile.

Smart surfaces that reversibly change the interfacial friction coefficients in response to external stimuli enable a wide range of applications, such as grips, seals, brake pads, packaging films, and fabrics. Here, a new concept of such a smart frictional system is reported: a composite film of a plain-weave polyester textile sheet and a thermoresponsive nematic liquid crystalline elastomer (LCE). The composite is deployed with retractable microundulations of the elastomer inside each weave mesh, enabling dramatic changes of the contact interface with the opposing surface on LCE actuation, which is induced, e.g., by a change in temperature (T). At room T, the protruding viscoelastic parts of LCE in the nematic phase make contact with the opposing flat surface, resulting in a very high friction. At an elevated T (≈50°C, isotropic phase), the undulations of LCE surface are retracted within the thickness of the textile, and the contacts are limited to small regions around overlapping textile fibers, lowering the friction dramatically. This effect is fully reversible on heating/cooling cycles. The surface undulations are spontaneous, i.e., fabricated without any lithog. or alignment techniques. The present composite opens a new way for the application of sheets/films with switchable friction enabled by stimuli-responsive LCEs.

Advanced Materials Interfaces published new progress about Breaking strength. 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

Kim, Sunghwan published the artcileFabrication and Characterization of 3D Printed Polyvinyl Toluene Based Plastic Scintillator, COA of Formula: C17H28O8S4, the main research area is polyvinyl toluene diphenyloxazole plastic scintillator fabrication.

In this study, we report the fabrication and characterization of a 3D printed polyvinyl toluene based plastic scintillator by DLP (digital layer print) 3D printer. The homemade resin has been used for 3D printing. The organic solvents such as vinyl-toluene monomer, PPO (2,5-Diphenyloxazole), POPOP [1,4-bis(5-phenyloxazol-2-yl) benzene], pentaerythritol tetrakis (3-mercaptopropionate) and DHPA (dipentaerythritol hexa-acrylate) have been used as co-polymers. Irgacure 184 (BASF Co.) is used as photo-initiator. Using DLP 3D printer (http://attosystem.co.kr) and the prepared resin, a plastic scintillator is printed. The emission spectrum of the printed plastic scintillator is located between 400 and 600 nm, peaking at 424 nm. The relative light yield of the scintillator is about 80% of EJ-200, relatively and the decay time is about 3.9 ns.

Journal of the Korean Physical Society published new progress about Scintillators. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, COA of Formula: C17H28O8S4.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Russo, Claudio published the artcileElectro-responsive shape-memory composites obtained via dual-curing processing, Recommanded Product: Pentaerythritol tetra(3-mercaptopropionate), the main research area is electro responsive shape memory composite dual curing.

In this work, electro-responsive shape-memory actuators were developed by incorporating a conductive heater in a dual-curing thiol-acrylate-epoxy shape-memory polymer (SMP). A conductive heater, consisting of an elec. conductive silver-ink track printed on Kapton substrate, was assembled to the SMP, taking advantage of the dual-curing processing. The shape-memory effect (SME) was activated by the heat dissipated by the Joule effect in the conductive track. Boron nitride agglomerates were dispersed in the thiol-acrylate-epoxy layers to increase thermal conductivity and achieve faster shape-recovery. A thermoelec. control unit was developed to control the shape recovery of the electro-responsive actuators and provide different activation strategies. The elec. activated SME was investigated and compared to a traditional SME based on an external heating source given by the dynamic mech. analyzer (DMA) apparatus Electro-responsive actuators were found extremely faster than the conventional SMPs based on external heating. The fastest recovery was obtained by the 15% boron nitride actuator, which recovered the 100% of the original shape in only 8 s. The thermoelec. controlling device provided an optimal control of the shape recovery speed based on the pulse width modulation of the heating current under the application of a low voltage (5 V).

Polymers for Advanced Technologies 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