Category: 3290-92-4

Hwangbo, Na-Kyung; Nam, Na-Eun; Choi, Jong-Hoon; Kim, Jong-Eun published the artcile< Effects of the Washing Time and Washing Solution on the Biocompatibility and Mechanical Properties of 3D Printed Dental Resin Materials>, Quality Control of 3290-92-4, the main research area is printed dental resin biocompatibility mech property; additive manufacturing; cell viability; confocal laser scanning; cytotoxicity; flexural modulus; flexural strength; scanning electron microscopy; three-dimensional printing; washing solution; washing time.

Three-dimensional (3D) printing technol. is highly regarded in the field of dentistry. Three-dimensional printed resin restorations must undergo a washing process to remove residual resin on the surface after they have been manufactured However, the effect of the use of different washing solutions and washing times on the biocompatibility of the resulting resin restorations is unclear. Therefore, we prepared 3D-printed denture teeth and crown and bridge resin, and then washed them with two washing solutions (iso-Pr alc. and tripropylene glycol monomethyl ether) using different time points (3, 5, 10, 15, 30, 60, and 90 min). After this, the cell viability, cytotoxicity, and status of human gingival fibroblasts were evaluated using confocal laser scanning. We also analyzed the flexural strength, flexural modulus, and surface SEM imaging. Increasing the washing time increased the cell viability and decreased the cytotoxicity (p < 0.001). Confocal laser scanning showed distinct differences in the morphol. and number of fibroblasts. Increasing the washing time did not significantly affect the flexural strength and surface, but the flexural modulus of the 90 min washing group was 1.01 ± 0.21 GPa (mean ± standard deviation), which was lower than that of all the other groups and decreased as the washing time increased. This study confirmed that the washing time affected the biocompatibility and mech. properties of 3D printed dental resins. Polymers (Basel, Switzerland) published new progress about Bending strength. 3290-92-4 belongs to class esters-buliding-blocks, and the molecular formula is C18H26O6, Quality Control of 3290-92-4.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Kitagawa, Haruaki; Kitagawa, Ranna; Tsuboi, Ririko; Hirose, Nanako; Thongthai, Pasiree; Sakai, Hirohiko; Ueda, Mayuka; Ono, Shunka; Sasaki, Jun-Ichi; Ooya, Tooru; Imazato, Satoshi published the artcile< Development of endodontic sealers containing antimicrobial-loaded polymer particles with long-term antibacterial effects>, Safety of 2-Ethyl-2-((methacryloyloxy)methyl)propane-1,3-diyl bis(2-methylacrylate), the main research area is antimicrobial polymer particle endodontic sealer antibacterial effect; Antibacterial; Antimicrobial; Cetylpyridinium chloride; Drug delivery; Endodontic filling; Infection control; PolyHEMA/TMPT particle; Resin; Sealer; Sustained release.

The objective of this study is to prepare new dental resins with a long-lasting antimicrobial activity. Specifically, this study evaluates an approach for controlling infection in root canals using sealers containing polyhydroxyethyl methacrylate trimethylolpropane trimethacrylate (polyHEMA/TMPT) particles loaded with cetylpyridinium chloride (CPC). In addition, the phys. properties of sealers containing CPC-loaded polyHEMA/TMPT particles (CLP) are determined PolyHEMA/TMPT particles with 10 (10%-CLP) and 25 weight% CPC (25%-CLP) with different particle sizes were fabricated and incorporated in HEMA-based sealers. CPC-release profiles were evaluated over 14 days of immersion in water, followed by 14 days of storage and 14 days of water immersion. The antibacterial activity of these sealers against Enterococcus faecalis in dentinal tubules was assessed using a root-canal-infection model. Their sealing abilities were evaluated by fluid filtration and phys. properties were tested according to the ISO 6876 standard The long-term antibacterial activity of the cured sealer containing 25%-CLP (∼21 μm particle diameter) was re-assessed after 1 yr of storage. After 28 days of immersion, 25%-CLP exhibited a higher and sustained CPC release unlike 10%-CLP. Residual bacteria in root dentinal tubules were eradicated by obturation with 25%-CLP-containing sealers. The incorporation of 25%-CLP (∼21 μm) had no adverse effects on the sealing ability and phys. properties of the sealer and resulted in long-term antibacterial activity. The incorporation of CPC-loaded particles in HEMA resins yielded endodontic sealers with long-term bactericidal activity against E. faecalis in root canals. These sealers can potentially be used to prevent recurrent apical periodontitis.

Dental Materials published new progress about Antibacterial agents. 3290-92-4 belongs to class esters-buliding-blocks, and the molecular formula is C18H26O6, Safety of 2-Ethyl-2-((methacryloyloxy)methyl)propane-1,3-diyl bis(2-methylacrylate).

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Liang, Jihong; Azhar, Umair; Men, Pengchao; Chen, Jian; Liu, Yining; He, Jinxuan; Geng, Bing published the artcile< Fluoropolymer/SiO2 encapsulated aluminum pigments for enhanced corrosion protection>, Application of C18H26O6, the main research area is fluoropolymer SiO2 encapsulated aluminum pigment corrosion.

Flake aluminum powders with excellent corrosive resistance properties are attractive materials in many technol. applications. Here, a convenient strategy is employed to encapsulate the aluminum powders by using silicon-fluoropolymer composite film, by which the chem. resistance of aluminum-based pigments is significantly improved. A basic layer of SiO2 is formed on the surface of the flake aluminum powders via sol-gel process. For the good compatibility between the silicon and fluorine, a uniform and dense layer of poly (trifluoroethyl methacrylate) (PTFEMA) is pasted tightly on the silicon layer initially formed by solution polymerization Protected by this kind of composite silicon-fluoro-layer, the encapsulated aluminum powders were highly stable when they dipped into strongly alk. solution (1.25 M, pH > 14). The morphol. of composite layers on the aluminum powders are characterized by means of SEM. The structures of silicon-fluoropolymer composite film are tested by Fourier transform IR spectroscopy (FTIR), energy dispersive spectroscopy (EDS) and XPS. The relationship between the usage of monomers and crosslinker on corrosion inhibition properties is systematically investigated. The phenomenon of hydrogen gas evolution is eliminated by the PTFEMA/SiO2 hybrid films owing to an efficient fluorinated protective film on aluminum pigments.

Applied Surface Science published new progress about Anticorrosive coating materials. 3290-92-4 belongs to class esters-buliding-blocks, and the molecular formula is C18H26O6, Application of C18H26O6.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Sahu, Dhananjay; Sahu, Raj Kumar; Patra, Karali published the artcile< Effects of crosslink density on the behavior of VHB 4910 dielectric elastomer>, Quality Control of 3290-92-4, the main research area is acrylic elastomer trimethylolpropane trimethylacrylate crosslink density mech property.

Interpenetration of dielec. elastomers with fillers is an effective technique to improve requisite properties for voltage induced electromech. performance. However, the requirement that the rigid frame has to maintain its pre-strained state, and time/temperature related phenomenon like stress relaxation/concentration, strain-induced crystallization and void propagation etc., limits this technol. To overcome these limitations, thermochem. and UV irradiation techniques of polymerization are used to modify the macromol. structures of VHB 4910 elastomer with crosslink monomers. Both the methods are compared in terms of the modification in surface and mol. structure through optical microscope and IR spectroscopy, resp. Thermochem. modified samples are found flawless with regular surface reformation; crosslink d. is evaluated and its influences on hysteresis, dielec. constant and material degradation at elevated temperature are characterized. Results from this study may contribute towards the complete understanding of space d. for inclusion of filler, used for material development with user-defined properties.

Journal of Macromolecular Science, Part A: Pure and Applied Chemistry published new progress about Acrylic rubber Role: PRP (Properties), SPN (Synthetic Preparation), PREP (Preparation) (VHB 4910, reaction products with trimethylolpropane trimethylacrylate). 3290-92-4 belongs to class esters-buliding-blocks, and the molecular formula is C18H26O6, Quality Control of 3290-92-4.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Lotierzo, Andrea; Meaney, Shane P.; Bon, Stefan A. F. published the artcile< Effect of the addition of salt to Pickering emulsion polymerizations using polymeric nanogels as stabilizers>, SDS of cas: 3290-92-4, the main research area is polystyrene preparation sodium chloride nanogel pickering emulsion polymerization stabilizer.

Nanogels made from crosslinked block copolymer micelles are used as stabilizers in the Pickering emulsion polymerization of styrene. The effect of the addition of salt, i.e. NaCl, on the emulsion polymerization is studied. It is shown that an increase in ionic strength of the dispersing medium in these polymerizations led to the formation of latexes of larger diameters Along with an increase in size, the morphol. of these polymer colloids changed from Janus to patchy with an increase in number of nanogels adsorbed on the polymer surface, as a function of the salt concentration in water. In particular, at the highest tested ionic strength, ca. 25 mM, fully armored polymeric particles surrounded by a dense layer of adsorbed stabilizing nanogels were formed. Kinetic studies carried out at varying NaCl concentrations suggested that particle formation in the reaction followed a combination of a coagulative nucleation mechanism, characterized by a clustering process of Janus precursors to form bigger aggregates, and droplet nucleation. Preliminary film formation studies on latexes made with Bu acrylate as a comonomer indicated the potential of this technique for the production of coherent polymer films which included a substructure of functional nanogels.

Polymer Chemistry published new progress about Crosslinking. 3290-92-4 belongs to class esters-buliding-blocks, and the molecular formula is C18H26O6, SDS of cas: 3290-92-4.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Zhang, Qing; Fan, Liangbiao; Lu, Qiaomei; Yu, Xiaozhang; Liang, Meina; Nie, Jinfang; Li, Ningjie; Zhang, Lan published the artcile< Preparation and application of molecularly imprinted polymer solid-phase microextraction fiber for the selective analysis of auxins in tobacco>, Recommanded Product: 2-Ethyl-2-((methacryloyloxy)methyl)propane-1,3-diyl bis(2-methylacrylate), the main research area is molecularly imprinted polymer solid phase microextraction fiber auxin tobacco; magnetic molecularly imprinted polymers; meat products; norfloxacin; veterinary medicine.

As signal mols., auxins play an important role in mediating plant growth. Due to serious interfering substances in plants, it is difficult to accurately detect auxins with traditional solid-phase extraction methods. To improve the selectivity of sample pretreatment, a novel molecularly imprinted polymer -coated solid-phase microextraction fiber, which could be coupled directly to HPLC, was prepared with indole acetic acid as template mol. for the selective extraction of auxins. The factors influencing the polymer formation, such as polymerization solvent, crosslinker, and polymerization time, were studied in detail to enhance the performance of indole acetic acid-molecularly imprinted polymer coating. The morphol. and chem. stability of this molecularly imprinted polymer-coated fiber was characterized by SEM, IR spectrometry, and thermal anal. The extraction capacity of the molecularly imprinted polymer-coated solid-phase microextraction fiber was evaluated for the selective extraction of indole acetic acid and indole-3-pyruvic acid followed by HPLC anal. The linear range for indole acetic acid and indole-3-pyruvic acid was 1-100 μg/L and their detection limit was 0.5 μg/L. The method was applied to the simultaneous determination of two auxins in two kinds of tobacco (Nicotiana tabacum L and Nicotiana rustica L) samples, with recoveries range from 82.1 to 120.6%.

Journal of Separation Science published new progress about Auxins Role: ANT (Analyte), BSU (Biological Study, Unclassified), ANST (Analytical Study), BIOL (Biological Study). 3290-92-4 belongs to class esters-buliding-blocks, and the molecular formula is C18H26O6, Recommanded Product: 2-Ethyl-2-((methacryloyloxy)methyl)propane-1,3-diyl bis(2-methylacrylate).

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Buchsbaum, Julia; Ranis, Stephan; Angelow, Krassimir; Linden, Sven; Tegenkamp, Christoph; Goedel, Werner A. published the artcile< Hierarchically Structured Microsieves Produced via Float-Casting>, SDS of cas: 3290-92-4, the main research area is microsieve float casting.

This article shows a new way to produce hierarchical microsieves by layering three types of float-cast microsieves, differing from each other in their pore diameters (∼68μm, 7μm, and 0.24μm) on top of each other. The unsupported microsieves with 7 and 0.24μm pore sizes are mech. fragile. The complete hierarchical sieve composed of all three layers, however, can be handled manually without special precaution. This article further studies the flow through the hierarchical sieve and filtration via experiment, theory (Hagen-Poiseuille’s and Sampson-Roscoe’s law), and simulation (numerically solving the Navier-Stokes equations for a predefined set of discrete volumetric elements). The exptl., theor., and simulated permeances of the microsieves and the hierarchical sieves are in reasonable agreement with each other and are significantly higher than the permeances of conventional filtration media. In filtration experiments, the hierarchical sieves show the expected sharp size cut-off, retaining particles of diameters exceeding the pore diameter

Langmuir published new progress about Casting process (float). 3290-92-4 belongs to class esters-buliding-blocks, and the molecular formula is C18H26O6, SDS of cas: 3290-92-4.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Goedel, Werner A.; Glaeser, Kerstin; Mitra, Dana; Hammerschmidt, Jens; Thalheim, Robert; Ueberfuhr, Peter; Baumann, Reinhard R. published the artcile< Printing Reinforcing Structures onto Microsieves That Are Floating on a Water Surface>, Recommanded Product: 2-Ethyl-2-((methacryloyloxy)methyl)propane-1,3-diyl bis(2-methylacrylate), the main research area is silica sieve crosslinking ink jet printing.

This article describes the preparation of hierarchically structured microsieves via a suitable combination of float-casting and inkjet-printing: A mixture of hydrophobized silica particles of 600 nm ± 20 nm diameter, a suitable non-water-soluble nonvolatile acrylic monomer, a nonvolatile photoinitiator, and volatile organic solvents is applied to a water surface. This mixture spontaneously spreads on the water surface; the volatile solvents evaporate and leave behind a layer of the monomer/initiator mixture comprising a monolayer of particles, each particle protruding out of the monomer layer at the top and bottom surface. Photopolymerization of the monomer converts this mixed layer into a solid composite membrane floating on the water surface. Onto this membrane, while still floating on the water surface, a hierarchical reinforcing structure based on a photocurable ink is inkjet-printed and solidified. In contrast to the nonreinforced membrane, the reinforced membrane can easily be lifted off the water surface without suffering damage. Subsequently, the silica particles are removed, and thus, the reinforced composite membrane is converted into a reinforced microsieve of 350 nm ± 50 nm thickness bearing uniform through pores of 465 nm ± 50 nm diameter This reinforced microsieve is mounted into a filtration unit and used to filter model dispersions: its permeance for water at low Reynolds numbers is in accordance with established theories on the permeance of microsieves and significantly above the permeance of conventional filtration media; it retains particles exceeding the pore size, while letting particles smaller than the pore size pass.

Langmuir published new progress about Composite membranes. 3290-92-4 belongs to class esters-buliding-blocks, and the molecular formula is C18H26O6, Recommanded Product: 2-Ethyl-2-((methacryloyloxy)methyl)propane-1,3-diyl bis(2-methylacrylate).

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Solhi, Laleh; Atai, Mohammad; Nodehi, Azizollah; Imani, Mohammad published the artcile< Poly (methacrylic acid) modified spherical and platelet hybrid nanoparticles as reinforcing fillers for dentin bonding systems: Synthesis and properties>, Category: esters-buliding-blocks, the main research area is PMA silica resin nanoparticle drug delivery platelet adhesion teeth; Dental adhesives; Graft polymerization; Nanoparticles; Shear bond strength; Surface modification.

In this study the mech. and adhesion properties of an exptl. methacrylate based dentin bonding system containing a combination of spherical and layered platelet nanoparticles were investigated. The nanoparticles were first modified through surface graft polymerization of methacrylic acid in order to make the particles surface compatible with the bonding matrix resin. Graft free radical polymerization in aqueous media was performed to attach Poly (methacrylic acid) (PMA) chains onto the surface of Na-MMT nanoclay (Cloisite Na+) and silica nanoparticles (Aerosil 200). The hybrid PMA grafted nanoparticles (PMA-g-NC-Sil) were characterized using GPC, FTIR, TGA, and X-ray diffraction (XRD). Dentin adhesives containing different amounts of the hybrid modified nanoparticles were photopolymerized and their characteristics were studied using FTIR, TEM, SEM, EDXA, and XRD techniques. The adhesives containing different amounts of PMA-g-NC-Sil were applied to the conditioned human premolar dentin to bond a dental composite to the teeth. The bond strength was then measured by microshear bond strength testing method. The results were analyzed and compared statistically. The stability of PMA-g-NC-Sil dispersion in the dentin adhesive was investigated using separation anal. (LUMi Reader) techniques. The grafting of PMA chains onto the surface of nanoclay was confirmed by FTIR and TGA anal. techniques. The intercalated-exfoliated structure for the nanoclay platelets in the photo-cured adhesive was observed using XRD and TEM. The surface modification of the nanoparticles significantly increased the dispersion stability of the fillers in the adhesive solution The microshear test results indicated that the incorporation of the PMA-g-NC-Sil nanoparticles significantly enhanced the bond strength to dentin with the highest shear bond strength observed at 0.5 wt%. The incorporation of the PMA modified hybrid nanofillers into the dentin adhesive resulted in a dentin bonding agent with enhanced shear bond strength through reinforcing the adhesive matrix and potential interactions between their carboxylic acid groups and the tooth structure. The dispersion stability of the nanoparticles was also dramatically improved by the surface modification of the nanoparticles.

Journal of the Mechanical Behavior of Biomedical Materials published new progress about Adhesion, physical. 3290-92-4 belongs to class esters-buliding-blocks, and the molecular formula is C18H26O6, Category: esters-buliding-blocks.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Mamman, S.; Suah, F. B. M.; Raaov, M.; Mehamod, F. S.; Asman, S.; Zain, N. N. M. published the artcile< Removal of bisphenol A from aqueous media using a highly selective adsorbent of hybridization cyclodextrin with magnetic molecularly imprinted polymer>, SDS of cas: 3290-92-4, the main research area is magnetic molecularly imprinted polymer bisphenol adsorption structural thermodynamical property; adsorption; bisphenol A; molecularly imprinted polymer; water samples; �cyclodextrin.

In this study, a unique magnetic molecularly imprinted polymer (MMIP) adsorbent towards bisphenol A (BPA) as a template mol. was developed by bulk polymerization using ç?cyclodextrin (ç?CD) as a co-monomer with methacrylic acid (MAA) to form MMIP MAA-灏綜D as a new adsorbent. ç?CD was hybridized with MAA to obtain water-compactible imprinting sites for the effective removal of BPA from aqueous samples. Benzoyl peroxide and trimethylolpropane trimethacrylate were used as the initiator and cross-linker, resp. The adsorbents were characterized by Fourier transform IR spectroscopy, scanning electronic microscopy, transmission electron microscopy, vibrating sample magnetometer, Brunauer-Emmett-Teller and X-ray diffraction. 1H NMR spectroscopy was used to characterize the MAA-灏綜D and BPA-MAA-灏綜D complex. Several parameters influencing the adsorption efficiency of BPA such as adsorbent dosage, pH of sample solution, contact time, initial concentrations and temperature as well as selectivity and reusability study have been evaluated. MMIP MAA-灏綜D showed significantly higher removal efficiency and selective binding capacity towards BPA compared to MMIP MAA owing to its unique morphol. with the presence of ç?CD. The kinetics data can be well described by the pseudo second-order kinetic and Freundlich isotherm and Halsey models best fitted the isotherm data. The thermodn. studies indicated that the adsorption reaction was a spontaneous and exothermic process. Therefore, MMIP based on the hybrid monomer of MAA-灏綜D shows good potential of a new monomer in molecularly imprinted polymer preparation and can be used as an effective adsorbent for the removal of BPA from aqueous solutions

Royal Society Open Science published new progress about Adsorbents. 3290-92-4 belongs to class esters-buliding-blocks, and the molecular formula is C18H26O6, SDS of cas: 3290-92-4.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics