Tag: M.W=400-500

Zhang, Jingyi published the artcileLow-temperature cross-linkable hole transporting materials through chemical doping for solution-processed green PHOLEDs, Recommanded Product: Pentaerythritol tetra(3-mercaptopropionate), the main research area is crosslinkable hole transporting material surface morphol external quantum efficiency.

Since the inter-layer mutual solubility is an obstacle to the development of solution-processed OLED, crosslinking is considered to be the best method to obtain solvent resistance. Vinyl is the most widely reported crosslinking group, but a problem raised that crosslinking usually need a high temperature Here, two vinyl-crosslinked hole transporting materials, 3,3â€?(1,3,4-oxadiazole-2,5-diyl)bis (N-phenyl-N-(4-vinylphenyl)aniline) (OXZ-VPAN), 3,3â€?(4-phenyl-4H-1,2,4-triazole-3,5-diyl)bis (N-phenyl-N-(4-vinylphenyl)aniline) (TRZ-VPAN) were designed and synthesized. The introduction of pentaerythritol tetra(3-mercaptopropionate) (PETMP) and vinyl groups by thiol-ene reaction to reduce the crosslinking temperature As a result, crosslinking can be achieved at 120 °C with the solvent resistance higher than 99%. The surface morphol. of the films before and after crosslinking were characterized by at. force microscope, and it was found that the roughness of the film was improved after dopped with PETMP. The solution-processed green phosphorescent OLEDs devices based on the obtained HTM exhibit excellent performance. Maximum current efficiency of 57.1 cd A-1 and external quantum efficiency of 16.0% (Ir (mppy)3) are obtained when OXZ-VPAN served as HTL. This low temperature feasible crosslinking process to prepare HTLs promotes the development solution-processed OLEDs.

Organic Electronics published new progress about Crosslinking. 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

Sinha, Jasmine published the artcilePhototriggered Base Amplification for Thiol-Michael Addition Reactions in Cross-linked Photopolymerizations with Efficient Dark Cure, Quality Control of 7575-23-7, the main research area is phototriggered base amplification michael addition cross linked photopolymerization.

In the present work, the photocatalytic activity was investigated toward a thiol-Michael reaction of different combinations of 9-fluorenylmethyl carbamate (Fmoc) derivatives and photocaged amines (PCA) as base amplifiers and the catalytic base, resp. This phototriggering approach was systematically studied for evaluating its effect on kinetics between thiol and Michael acceptors like acrylate or sulfone wherein, Bu 3-mercaptopropionate (BMP), 1-hexyl acrylate (HA), and Et vinyl sulfone (EVS) were used as model reactants. Interestingly, PCAs exhibited low quantum yields by themselves; NPPOC-Hex (2.5 mol %) which when used with BMP and HA, resulted in only 25% thiol conversion; however, when used along with Fmoc-Hex or Fmoc-TMG (2.5 or 5 mol %), it resulted in a higher thiol conversion of 50-60%. Furthermore, use of NPPOC-DEA (5 mol %) with 1 mol % Fmoc-TMG resulted in >70% thiol conversion for the same system. Upon using BMP and EVS nearly complete conversion of functional groups with 5 mol % NPPOC-DEA and 5 mol % Fmoc-DEA was obtained. This enhancement in reaction kinetics and conversion upon addition of an Fmoc derivative to a monofunctional thiol-Michael system was extended to multifunctional derivatives for polymerizing cross-linked polymer networks. Moreover, the kinetic study on model reactants also demonstrated efficient dark curing, resulting in 50-75% thiol conversion with only 30 s irradiation time, leading to validation of the efficacy of Fmoc derivatives and PCAs as photocatalysts for dark cure. Upon precise characterization in cross-linked systems using Raman spectroscopy for TMPTA/PETMP in the presence of 20 mol % NPPOC-DEA and 1 mol % Fmoc-TMG, the extent of dark cure was evaluated for a distance of 16.5 mm, which was observed to undergo maximum conversion and high dark cure propagation upon heating to 70°C. Therefore, Fmoc-PCA catalysis is a practically useful approach for improving the photoinitiated efficiency of the thiol-Michael reaction and enabling photopolymerization in the dark with a marked improvement in photosensitivity.

Macromolecules (Washington, DC, United States) published new progress about Crosslinking. 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

Herbert, Katie M. published the artcileDynamic reaction-induced phase separation in tunable, adaptive covalent networks, Synthetic Route of 7575-23-7, the main research area is covalent adaptable network thia Michael reaction shape memory effect.

A series of catalyst-free, room temperature dynamic bonds derived from a reversible thia-Michael reaction are utilized to access mech. robust dynamic covalent network films. The equilibrium of the thiol addition to benzalcyanoacetate-based Michael-acceptors can be directly tuned by controlling the electron-donating/withdrawing nature of the Michael-acceptor. By modulating the composition of different Michael-acceptors in a dynamic covalent network, a wide range of mech. properties and thermal responses can be realized. Addnl., the reported systems phase-sep. in a process, coined dynamic reaction-induced phase separation (DRIPS), that yields reconfigurable phase morphologies and reprogrammable shape-memory behavior as highlighted by the heat-induced folding of a predetermined structure.

Chemical Science published new progress about Crosslinking. 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

Peng, Wenjun published the artcileAutonomous Off-Equilibrium Morphing Pathways of a Supramolecular Shape-Memory Polymer, Recommanded Product: Pentaerythritol tetra(3-mercaptopropionate), the main research area is thiol ene crosslinking ureidopyrimidinone network supramol shape memory polymer; 4D printing; shape-memory polymers; supramolecular bonds; time-temperature indicators; ureidopyrimidinone.

The diverse morphing behaviors of living creatures arise from their unlimited pathways. But the equilibrium-driven morphing pathways of common synthetic shape-shifting materials are very limited. For a shape-memory polymer (SMP), its recovery from the temporary shape(s) to the permanent shape typically requires external stimulation and follows a single fixed route. Herein, a covalently crosslinked SMP is designed with ample ureidopyrimidinone (UPy) supramol. moieties in the network. The UPy units endow the SMP with strong time-temperature dependency, which is explored as a mechanism for spatio-temporal programming of autonomous shape-shifting pathways. In particular, the use of digitally controlled photothermal heating provides versatility in control via an off-equilibrium mechanism. Cooling/heating across its glass transition introduces a locking/unlocking mechanism for its temporal morphing. The benefits of these unique features are demonstrated by multi-shape-transformation, an invisible-color-based clock, a time-temperature indicator, and sequence-programmable 4-dimensional printing.

Advanced Materials (Weinheim, Germany) published new progress about Crosslinking. 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

Nagane, Samadhan S. published the artcileDesign and Synthesis of Aromatic Polyesters Bearing Pendant Clickable Maleimide Groups, Formula: C17H28O8S4, the main research area is design aromatic polyester pendant clickable maleimide group.

A bisphenol bearing pendant maleimide group, namely, N-maleimidoethyl-3, 3-bis(4-hydroxyphenyl)-1-isobenzopyrrolidone (PPH-MA) was synthesized starting from phenolphthalein. Aromatic (co)polyesters bearing pendant maleimide groups were synthesized from PPH-MA and aromatic diacid chlorides, namely, isophthaloyl chloride (IPC), terephthaloyl chloride (TPC), and 50:50 mol % mixture of IPC and TPC by low temperature solution polycondensation technique. Copolyesters were also synthesized by polycondensation of different molar proportions of PPH-MA and bisphenol A with IPC. Inherent viscosities and number-average mol. weights of aromatic (co)polyesters were in the range of 0.52-0.97 dL/g and 20,200-32,800 g/mol, resp. indicating formation of medium to reasonably high-mol.-weight polymers. 13C NMR spectral anal. of copolyesters revealed the formation of random copolymers. The 10% weight loss temperature of (co)polyesters was found in the range 470-484 °C, indicating their good thermal stability. A selected aromatic polyester bearing pendant maleimide groups was chem. modified via thiol-maleimide Michael addition reaction with two representative thiol compounds, namely, 4-chlorothiophenol and 1-adamantanethiol to yield post-modified polymers in a quant. manner. Addnl., it was demonstrated that polyester containing pendant maleimide groups could be used to form insoluble crosslinked gel in the presence of a multifunctional thiol crosslinker. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018.

Journal of Polymer Science, Part A: Polymer Chemistry published new progress about Crosslinking. 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

Luo, Ming published the artcileHighly grafted functional polymer for promoting mechanical properties of EPDM/NFMs composite, Recommanded Product: Pentaerythritol tetra(3-mercaptopropionate), the main research area is grafted acrylic acid EPDM composite carbon black thermal.

It is of a great challenge to apply nonmetal fractions (NMFs) of waste printed circuit boards (WPCBs) as reinforcing fillers in rubbers. In this paper, a typical amorphous synthetic rubber, ethylene propylene terpolymer (EPDM), is used as the model material to investigate the mech. properties of EPDM/NMFs composites. A multifunctional grafting monomer containing two thiol groups and two carboxyl groups is designed and synthesized. The monomer is used to synthesize highly grafted EPDM-g-AA via melt grafting. Tensile strength of EPDM/NMFs composite sharply increases to 18 MPa when 10phr of EPDM-g-AA is used. The grafted polymer also significantly improves the thermal oxidation resistance. It can be expected that the strategy is able to be expanded to other rubber systems and opens the door to application of NMFs in rubber industry.

Polymer Bulletin (Heidelberg, Germany) published new progress about Ball milling. 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

Wacker, Kevin T. published the artcileHarnessing the Chemical Diversity of the Natural Product Magnolol for the Synthesis of Renewable, Degradable Neolignan Thermosets with Tunable Thermomechanical Characteristics and Antioxidant Activity, Recommanded Product: Pentaerythritol tetra(3-mercaptopropionate), the main research area is magnolol renewable degradable neolignan thermoset thermomech antioxidant polyester thioether.

Magnolol, a neolignan natural product with antioxidant properties, contains inherent, orthogonal, phenolic, and alkenyl reactive groups that were used in both direct thermoset synthesis, as well as the stepwise synthesis of a small library of monomers, followed by transformation into thermoset materials. Each monomer from the small library was prepared via a single step functionalization reaction of the phenolic groups of magnolol. Thermoset materials were realized through solvent-free, thiol-ene reactions, and the resulting crosslinked materials were each comprised of thioether and ester linkages, with one retaining the hydrophilic phenols from magnolol, another having the phenols protected as an acetonide, and two others incorporating the phenols into addnl. crosslinking sites via hydrolytically labile carbonates or stable ether linkages. With this diversity of chem. compositions and structures, the thermosets displayed a range of thermomech. properties including glass transition temperatures, Tg, 29-52 °C, onset of thermal degradation, Td, from about 290-360 °C, and ultimate strength up to 50 MPa. These tunable materials were studied in their degradation and biol. properties with the aim of exploiting the antioxidant properties of the natural product. Hydrolytic degradation occurred under basic conditions (pH = 11) in all thermosets, but with kinetics that were dependent upon their chem. structures and mech. properties: 20% mass loss was observed at 5, 7, 27, and 40 wk for the thermosets produced from magnolol directly, acetonide-protected magnolol, bis(allyl carbonate)-functionalized magnolol, and bis(allyl ether)-functionalized magnolol, resp. Isolated degradation products and model compounds displayed antioxidant properties similar to magnolol, as determined by both UV-vis and in vitro reactive oxygen species (ROS) assays. As these magnolol-based thermosets were found to also allow for extended cell culture, these materials may serve as promising degradable biomaterials.

Biomacromolecules published new progress about Antioxidants. 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

Chen, Guancong published the artcileHeterogeneous Solid-State Plasticity of a Multi-Functional Metallo-Supramolecular Shape-Memory Polymer towards Arbitrary Shape Programming, Quality Control of 7575-23-7, the main research area is metallo supramol shape memory polymer; metallo-supramolecular interactions; reprocessing; self-welding; shape programming; shape-memory polymers.

Shape-memory polymers (SMPs) exhibit notable shape-shifting behaviors under environmental stimulations. In a specific shape-memory cycle, the material can be temporarily fixed at diverse geometries while recovering to the same permanent shape driven by the elastic network, which somewhat limits the versatility of SMPs. Via dynamic metallo-supramol. interactions, herein, we report a multi-functional shape-memory polymer with tunable permanent shapes. The network is constructed by the metallic coordination of a four-armed polycaprolactone with a melting temperature of 54°C. Owing to the thermo-induced stress relaxation through the bond exchange, the SMPs can be repeatedly programmed into different geometries in their solid state and show the self-welding feature. Via further welding of films crosslinked by different ions, it will present heterogeneous solid-state plasticity, and a more sophisticated shape can be created after the uniform thermal treatment. With elasticity and plasticity in the same network, the SMPs will display programmable shape-shifting behaviors. Addnl., the used material can be recast into a new film which retains the thermo-induced plasticity. Overall, we establish a novel strategy to manipulate the permanent shapes of SMPs through solid-state plasticity and develop a multi-functional shape-shifting material that has many practical applications.

Polymers (Basel, Switzerland) published new progress about Melting point. 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

Guan, Qiyuan published the artcileRapid decomposition of epoxy resins via Raman spectrometry in combination with machine learning algorithms, Category: alcohols-buliding-blocks, the main research area is epoxy resins machine learning algorithm BADGE PETMP Raman spectrometry.

Epoxy resins are a group of important materials that have been used everywhere and development of new materials of this kind with optimal mech. properties from either bio-resources or industrial precursors has drawn great focus from scientists and engineers. By reacting different kinds of epoxy adhesives and curatives, massive kinds of epoxy resins with different characteristics are produced. Determination of original mixing ratio of epoxy adhesives and corresponding curatives of their curing products is useful in controlling and examining these materials. Here in this work, we described an efficient method based on Raman spectrometry and machine learning algorithms for rapid molar composition determination of epoxy resins. Original mixing ratio of epoxy adhesives and curatives could be calculated simply via Raman spectra of the products. Raman spectral data scanned during curing procedure was fed to random forest (RF) classification to calculate weights of Raman shift features and reduce data dimensionality, then spectral data of selected features were processed by partial least squares regression (PLSR) for model training and composition ratio determination It turned out that ratio predictions of our model fit well to their actual values, with a coefficient of determination (R2) of 0.9926, and a root mean squared error (RMSE) of 0.0305.

Journal of Bioresources and Bioproducts published new progress about Decomposition. 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

Hu, Zhiqi published the artcileImproved Mechanical Durability of High-Performance OPVs Using Semi-Interpenetrating Networks, Category: alcohols-buliding-blocks, the main research area is organic photovoltaic device bending deformation mech durability.

Organic photovoltaic (OPV) devices offer a number of unique advantages over conventional single crystal silicon solar cells, such as simple and low-cost fabrication, significantly reduced weight, high flexibility, and semitransparency. However, OPV devices exhibit poor durability to mech. deformations. Here, the use of an elastic semi-interpenetrating network is studied to improve the mech. durability of the active layer of OPV devices based on the high-performance donor:acceptor blend (PBDBT-2F:ITIC). The elastic interpenetrating network is synthesized in situ through the UV photoinitiated crosslinking of thiol-ene additives in the active layer. The effects of strain as a function of bending on the network-stabilized active layer structure are systematically investigated. The elastic interpenetrating network suppresses crack formation and improves durability to high-curvature and repeated bending deformations. Performance measurements show that network-stabilized devices outperform pristine devices above a critical bending strain and number of bending deformations. The photovoltaic performance in general decreases with the increase in the network content, and the best performing devices are obtained using network forming reagents that are most compatible with the donor:acceptor system. This work describes an effective route to flexible devices using semi-interpenetrating polymer networks and provides insight into the design of the networks to maximize photovoltaic performance.

Advanced Optical Materials published new progress about Contact angle. 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