Tag: M.W=250-300

Liu, Jian published the artcilePrinting 3D Of Complex-Shaped Polymer-Derived Ceramics With Enhanced Structural Retention, Recommanded Product: Trimethylolpropane triacrylate, the publication is Materials and Manufacturing Processes (2022), 37(11), 1267-1279, database is CAplus.

The combination of polymer-derived ceramics and DLP 3D printing has significant advantages for manufacturing special polynary ceramics with complex structures. However, a large number of the organic components in the precursor rapidly burn out and release after evaporation during pyrolysis. This leads to structural retention issues such as sample deformation, shrinkage and cracking. The surface morphol. and accuracy of the sample are greatly affected by the escape of organic matter and the release of thermal stress during the pyrolysis process. Therefore, this study employs the method of adding low-melting-point silicone oil based on the original material components. The slow burn-out process of silicone oil at a lower temperature can produce fine pores, which would aid the release of thermal stress. Addnl., it can provide channels for escape of the organic gas at high-temperature, which helps to reduce large deformation and cracking and improves the surface morphol. and dimensional accuracy of the final pyrolyzed samples. The method studied in this work helps to enhance the structural retention of complex-shaped polymer-derived ceramics manufactured by 3D printing and high-temperature pyrolysis, which could be beneficial to the further mass fabrication of such ceramic products.

Materials and Manufacturing Processes published new progress about 15625-89-5. 15625-89-5 belongs to esters-buliding-blocks, auxiliary class Polymerization Reagents,Crosslinkers, name is Trimethylolpropane triacrylate, and the molecular formula is C15H20O6, Recommanded Product: Trimethylolpropane triacrylate.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Qiu, Teng published the artcileSynthesis of poly(lactic acid)-based macro-porous foams with thermo-active shape memory property via W/O high internal phase emulsion polymerization, Name: Trimethylolpropane triacrylate, the publication is Colloid and Polymer Science (2022), 300(4), 415-427, database is CAplus.

Here, the synthesis of macro-porous polymer foams by using bio-based poly(lactic acid) (PLA) as macro-monomer was carried out via W/O high internal phase emulsion (HIPE) polymerization The PLA macro-monomer end-capped by di-acrylate groups was employed as the continuous phase and copolymerized with fluorinated methacrylate, 2-ethylhexyl acrylate, and acrylate crosslinkers. The interconnected macro-porous polyHIPEs showed the thermo-responsive shape memory property. It is found that the transition temperature (Ttrans) of the polyHIPEs in shape recover cycle is adjustable in the temperature range from 24.5 to 107.8°, corresponding to their glass transition temperature (Tg), which can be controlled by the ratio of macro-, fluorinated, and acrylate monomers. In this work, the best shape memory property is obtained with a PLA content over 40%. The corresponding polyHIPEs could change their shape with a compress ratio as high as 50% at the temperature above Ttrans, maintain the temporary shape by cooling to room temperature, and exhibit a nearly 100% recovery upon reheating. Scanning electron microscope (SEM) results suggest that the macro-porous structure can be maintained without collapse of the pores in at least four compression-recovery cycles. These polyHIPEs also have degradation capabilities.

Colloid and Polymer Science published new progress about 15625-89-5. 15625-89-5 belongs to esters-buliding-blocks, auxiliary class Polymerization Reagents,Crosslinkers, name is Trimethylolpropane triacrylate, and the molecular formula is C15H20O6, Name: Trimethylolpropane triacrylate.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Chen, Yunle published the artcileResponse of the Aerodyne Aerosol Mass Spectrometer to Inorganic Sulfates and Organosulfur Compounds: Applications in Field and Laboratory Measurements, COA of Formula: C6H4KNO6S, the publication is Environmental Science & Technology (2019), 53(9), 5176-5186, database is CAplus and MEDLINE.

Organosulfur compounds are important components of secondary organic aerosols (SOA). While Aerodyne high-resolution time-of-flight aerosol mass spectrometers (AMS) have been extensively used in aerosol studies, the AMS response to organosulfur compounds is not well understood. This work assessed fragmentation patterns of organosulfur and inorganic sulfate compounds in the AMS, developed a method to deconvolve total sulfates into components of inorganic and organic origins, and applied this method in laboratory and field measurements. Apportionment results from laboratory isoprene photooxidation experiments showed that with an inorganic sulfate seed, sulfate functionality of organic origins can contribute ∼7% of SOA mass at peak growth. Results from southeastern US measurements showed 4% of measured sulfate is from organosulfur compounds Methanesulfonic acid was estimated for coastal and remote marine boundary layer measurements. Application of this method was assessed for unit mass-resolution data, where it performed less well due to interferences. Apportionment results demonstrated organosulfur compounds could be a non-negligible source of sulfate fragments in AMS laboratory and field datasets. A re-evaluation of previous AMS measurements over the full range of atm. conditions using this method could provide a global estimate/constraint on the contribution of organosulfur compounds

Environmental Science & Technology published new progress about 6217-68-1. 6217-68-1 belongs to esters-buliding-blocks, auxiliary class Salt,Nitro Compound,Sulfonate,Benzene, name is Potassium 4-nitrophenyl sulfate, and the molecular formula is C6H4KNO6S, COA of Formula: C6H4KNO6S.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Huang, Minzhong published the artcileThree dimensional -printing of polymer-derived SiCN ceramic matrix composites by digital light processing, Recommanded Product: Trimethylolpropane triacrylate, the publication is Journal of the European Ceramic Society (2022), 42(13), 5476-5483, database is CAplus.

In this study, we present a DLP 3D-printing strategy for the fabrication of SiCN ceramic matrix composites (CMCs). The polysilazane-based preceramic polymer containing inert fillers was UV-cured into a green body and then converted to SiCN CMCs after pyrolysis. The introduced fillers (Si₃N₄ particles and Si₃N₄ whiskers) as reinforcements are well dispersed in the matrix, which can not only effectively reduce the linear shrinkage and weight loss, but also greatly improve the mech. properties of the SiCN CMCs. The bending strength of the SiCN CMCs reinforced with 10 wt% Si₃N₄ whiskers (without surface polished) reached 180.7 ± 15.6 MPa. Furthermore, the effect of fillers content on microstructure and porosity of the SiCN CMCs are discussed, and it was found that the excessive fillers led to increased pore defects and decreased continuity of the matrix, thereby reducing the mech. properties of the SiCN CMCs. This strategy provides a promising ceramic manufacturing technique to fabricate polymer-derived CMCs with complex-shaped and high-performance for potential demanding applications.

Journal of the European Ceramic Society published new progress about 15625-89-5. 15625-89-5 belongs to esters-buliding-blocks, auxiliary class Polymerization Reagents,Crosslinkers, name is Trimethylolpropane triacrylate, and the molecular formula is C15H20O6, Recommanded Product: Trimethylolpropane triacrylate.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Feng, Wanru published the artcileTransformation of Al-CDC from 3D crystals to 2D nanosheets in macroporous polyacrylates with enhanced CH₄/N₂ separation efficiency and stability, Name: Trimethylolpropane triacrylate, the publication is Chemical Engineering Journal (Amsterdam, Netherlands) (2022), 132285, database is CAplus.

Development of materials with high efficiency and long-life cycles for CH₄/N₂ separation is of importance for coal-bed methane purification Herein, a composite was prepared by in-situ growing the specific aluminum-based metal-organic framework (MOF) with trans-1,4-cyclohexanedicarboxylicacid as ligand (Al-CDC) on the internal macroporous surface of polyacrylates (PA). Due to the surface-induced low-energy-barrier orientation crystallization, the morphol. of Al-CDC was transformed from three-dimensional (3D) crystals to two-dimensional (2D) nanosheets, forming ultrathin films with higher adsorption efficiency and lower diffusion barrier. As a result, the adsorption efficiency can be increased by 1.73 times compared with bulk Al-CDC and the selectivity of CH₄/N₂ (50/50, volume/volume) mixed gas is 13.75, which is the highest value reported so far. Furthermore, the hydrophobic feature of PA enhanced the water and recycling stability of composite, providing promising adsorbent for coal-bed methane purification using pressure swing adsorption process.

Chemical Engineering Journal (Amsterdam, Netherlands) published new progress about 15625-89-5. 15625-89-5 belongs to esters-buliding-blocks, auxiliary class Polymerization Reagents,Crosslinkers, name is Trimethylolpropane triacrylate, and the molecular formula is C15H20O6, Name: Trimethylolpropane triacrylate.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Denehy, Emma published the artcileGround state structures of sulfate monoesters and sulfamates reveal similar reaction coordinates for sulfuryl and sulfamyl transfer, Synthetic Route of 6217-68-1, the publication is Chemical Communications (Cambridge, United Kingdom) (2006), 314-316, database is CAplus and MEDLINE.

Structure/reactivity and structure/structure correlations of 5 sulfate monoesters and 11 sulfamate esters determined by low temperature X-ray crystallog. reveal similar ground state deformations that suggest similar reaction coordinates for sulfuryl and sulfamyl group transfer.

Chemical Communications (Cambridge, United Kingdom) published new progress about 6217-68-1. 6217-68-1 belongs to esters-buliding-blocks, auxiliary class Salt,Nitro Compound,Sulfonate,Benzene, name is Potassium 4-nitrophenyl sulfate, and the molecular formula is C6H4KNO6S, Synthetic Route of 6217-68-1.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Bojarova, Pavla published the artcileAryl sulfamates are broad spectrum inactivators of sulfatases: Effects on sulfatases from various sources, Recommanded Product: Potassium 4-nitrophenyl sulfate, the publication is Bioorganic & Medicinal Chemistry Letters (2009), 19(2), 477-480, database is CAplus and MEDLINE.

Aryl sulfamates were originally developed as inhibitors of steroid sulfatase, and have recently been shown to be powerful inactivators of a bacterial sulfatase, PaAtsA from Pseudomonas aeruginosa. We demonstrate that a simple aryl sulfamate, 3-nitrophenyl sulfamate, can inactivate sulfatases from various sources including snail, limpet and abalone. In each case inactivation was time-dependent and active-site directed, as demonstrated by protection against inactivation by substrate. These results suggest that such easily acquired aryl sulfamates can be used as reliable biochem. reagents for the study of sulfatases from a diverse array of sources.

Bioorganic & Medicinal Chemistry Letters published new progress about 6217-68-1. 6217-68-1 belongs to esters-buliding-blocks, auxiliary class Salt,Nitro Compound,Sulfonate,Benzene, name is Potassium 4-nitrophenyl sulfate, and the molecular formula is C6H4KNO6S, Recommanded Product: Potassium 4-nitrophenyl sulfate.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Burkhardt, George N. published the artcileNitroarylsulfuric acids and their reduction products, Product Details of C6H4KNO6S, the publication is Journal of the Chemical Society (1929), 141-52, database is CAplus.

ClSO₃H (1.4 mols.) was added to 3.7 mols. PhNMe₂ in 500 cc. CS₂ kept below 16°; to the mixture, heated to 35°, O₂NC₆H₄OH or O₂NC₁₀H₆OH (1 mol.) was added all at once; after stirring at 35° for 1 hrs., the product was poured into dilute KOH; details for the separation of the K salts are given. K o-nitrophenyl sulfate, solubility in H₂O at 17°6”; the p-isomer has the same solubility; K 1-nitro-2-naphthyl sulfate, pale yellow needles; the 4-nitro-1-naphthyl derivative forms fine, pale yellow needles. These are all rapidly hydrolyzed by very dilute HCl at 70° and slowly at 100° by 10% Ba(OH)₂, or dilute AcOH containing AcONa. Reduction with FeSO₄ in a suspension of CaCO₃ or BaCO₃ gives the corresponding NH₂ derivatives, which give Ac and benzylidene derivatives without loss of the SO₄ group. K o-aminophenyl sulfate, gives with Br a faint violet color; the p-isomer crystallines with 1 H₂O, gives a violet color with Br and with HCl or AcOH and H derivative; the K benzylidene derivative crystallines with 0.5 H₂O. K 1-amino-2-naphthyl sulfate, crystallines with 0.5 H₂O; solubility in H₂O at 17° 1.1%; Br gives a dirty green precipitate, changing to yellow with excess of Br; FeCl₃ gives an opalescence and then a blue precipitate, which changes to brown; HCl or AcOH precipitates the H derivative, needles. p-H₂NC₅H₄SO₄H yields a diazo compound, which couples with m-C₆H₄(OH)₂, giving K dihydroxybenzeneazophenyl sulfate, orange plates with 1.5 H₂O; boiling with dilute HCl splits off the HSO₄ group; the 2-hydroxynaphthalene derivative, dark red, crystallines with 0.5 H₂O; precipitates are formed with BaCl₂, CaCl₂, HgNO₃ and MgSO₄. Results of dye tests with wool are given. The SO₄H group is removed when it is o- to the NH₄ group, but the diazo oxide results. Alk. reduction of o-O₂NC₆H₄SO₄K gives a mixture of azo and hydrazo derivatives K azobenzene 2,2′-disulfate, orange plates with 0.5 H₂O, rapidly hydrolyzed at 70° by HCl. K hydrazobenzene 2,2′-disulfate, needles; solubility in H₂O at 19° 3.2%, at 32° 5.4%; a saturated solution at 20° with concentrated HCl deposits 4,4′-diaminodiphenylene di-H 3,3′-disulfate, needles with 2.5 H₂O; the K salt crysts, with 1 H₂O; characteristic reactions with Br and FeCl₃ are given. Diacetyldihydroxybenzidine, m. 292° (decomposition); heating at 300-20° for 0.75 hr. gives the dianhydro derivative, m. 164-5°; the same compound was prepared from the sulfate.

Journal of the Chemical Society published new progress about 6217-68-1. 6217-68-1 belongs to esters-buliding-blocks, auxiliary class Salt,Nitro Compound,Sulfonate,Benzene, name is Potassium 4-nitrophenyl sulfate, and the molecular formula is C6H4KNO6S, Product Details of C6H4KNO6S.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Atkinson, Benjamin N. published the artcileRegioselective and enantiospecific synthesis of the HSP co-inducer arimoclomol from chiral glycidyl derivatives, SDS of cas: 115314-17-5, the publication is Organic & Biomolecular Chemistry (2017), 15(46), 9794-9799, database is CAplus and MEDLINE.

A new efficient chiral synthesis of enantiopure arimoclomol is reported from (R)-(-)-glycidyl nosylate with complete retention of chiral integrity. Off-target pharmacol. of arimoclomol was evaluated against a representative set of drug targets and showed modest binding to a few kinases. Pharmacokinetic data was generated in vivo in mouse and showed a low brain : plasma ratio. These studies will be helpful towards a better understanding of the PK-PD relationship of arimoclomol in disease models.

Organic & Biomolecular Chemistry published new progress about 115314-17-5. 115314-17-5 belongs to esters-buliding-blocks, auxiliary class Epoxides,Chiral,Nitro Compound,Sulfonate,Benzene, name is (R)-Oxiran-2-ylmethyl 3-nitrobenzenesulfonate, and the molecular formula is C9H9NO6S, SDS of cas: 115314-17-5.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Gong, Jian published the artcileDigital light processing of SiC ceramic from allylhydridopolycarbosilane with limited acrylate monomers, COA of Formula: C15H20O6, the publication is Ceramics International (2022), 48(13), 18468-18474, database is CAplus.

Digital light processing of ceramic precursor was used to prepare SiC rich ceramic parts in this study. In order to achieve appropriate light curing rate, the ceramic precursor allylhydropolycarbosilane (LHBPCS) was mixed with acrylate monomers tripropylene glycol diacrylate and trimethylolpropane triacrylate. The content of acrylate monomers was optimized to increase the ceramic yield and reduce the shrinkage during pyrolysis. According to the results of thermogravimetric anal. and photolithog. experiment, 15 wt% acrylate monomers was appropriate. 330 mJ/cm2 UV irradiation dose was selected for every layer with a thickness of 25 μm, and green bodies with different shapes were successfully printed. During pyrolysis, these printed parts changed from transparent yellow to black accompanying uniform shrinkage. At 1000 °C, the shrinkage was 24.0-26.0%, and crack-free SiC rich ceramic parts with d. of 2.11 g/cm3 and chem. formula of SiC1.31O0.26 were obtained.

Ceramics International published new progress about 15625-89-5. 15625-89-5 belongs to esters-buliding-blocks, auxiliary class Polymerization Reagents,Crosslinkers, name is Trimethylolpropane triacrylate, and the molecular formula is C15H20O6, COA of Formula: C15H20O6.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics