Category: 10287-53-3

Wang, Xiance published the artcileEvaluation of a photo-initiated copper(I)-catalyzed azide-alkyne cycloaddition polymer network with improved water stability and high mechanical performance as an ester-free dental restorative, COA of Formula: C11H15NO2, the publication is Dental Materials (2021), 37(10), 1592-1600, database is CAplus and MEDLINE.

The objective is to develop and characterize an ester-free ether-based photo-CuAAC resin with high mech. performance, low polymerization-induced stress compared with common BisGMA/TEGDMA (70/30) resins, and improved water stability in comparison to previously developed urethane-based photo-CuAAC resins.Triphenyl-ethane-centered ether-linked tri-azide monomers were synthesized and co-photopolymerized with ether-linked tri-alkyne monomers under visible light irradiation using a copper(II) pre-catalyst and CQ/EDAB as the initiator. The ether-based CuAAC formulation was investigated for thermo-mech. properties, polymerization kinetics and shrinkage stress, and flexural properties with respect to a conventional BisGMA/TEGDMA (70/30) dental resin. In addition, both the ether-based CuAAC resin and the urethane-based CuAAC resin were examined for their water stability using the BisGMA/TEGDMA (70/30) resin as a control.The ether-based CuAAC network (AK/AZ-1) exhibited a slightly lower glass-transition temperature compared with the BisGMA/TEGDMA network (108 °C vs 128 °C), but because of its much sharper glass transition, the AK/AZ-1 CuAAC-network maintained storage modulus higher than 1 GPa up to 100 °C. In addition, the ether-based AK/AZ-1 network exhibited reduced shrinkage stress (0.56 MPa vs 1.0 MPa) and much higher flexural toughness (7.6 MJ/m³ vs 1.6 MJ/m³ ) while showing slightly lower flexural modulus and slightly higher flexural strength compared with the BisGMA/TEGDMA network. Moreover, the ether-based AK/AZ-1 CuAAC network displayed comparable water stability in comparison to the BisGMA/TEGDMA network with slightly higher water sorption (46 Μg/mm³ vs 38 Μg/mm³ ) and much lower water solubility (2.3 Μg/mm³ vs 4.4 Μg/mm³ ).Employing the ether-based hydrophobic CuAAC formulation significantly improved the water stability of the CuAAC network compared with previously developed urethane-based CuAAC networks. Furthermore, compared with the conventionally used BisGMA/TEGDMA formulation, the reduced shrinkage stress, comparable flexural strength/flexural modulus, and the superior flexural toughness of the ether-based CuAAC network make it a promising ester-free alternative to the currently widely-used methacrylate-based dental restoratives.

Dental Materials published new progress about 10287-53-3. 10287-53-3 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Ester, name is Ethyl 4-dimethylaminobenzoate, and the molecular formula is C15H20N2O2, COA of Formula: C11H15NO2.

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

Alarcon, Rafael T. published the artcileA new acrylated monomer from macaw vegetable oil that polymerizes without external photoinitiators, Formula: C11H15NO2, the publication is Journal of Polymer Research (2021), 28(11), 425, database is CAplus.

The photopolymerization process has been widely studied due to its use in painting/coating, dentistry, creating photoresist materials and more recently in 3D printing. Therefore, new monomers have been synthesized to be used in this growing area. Here, a new Brazilian biomass derived, renewable monomer from macaw vegetable oil is presented. This monomer can self-polymerize without photoinitiation under UV light, reaching a monomer conversion of 75% and a conversion of 88% when Et 4-(dimethylamino)benzoate is present as a coinitiator. Furthermore, the final polymer has an orange color under visible light and exhibits fluorescence (a blue color) under UV radiation. Monomers and polymers formed from macaw (macauba) vegetable oil are thermally stable up to 220°C, as evidenced by thermogravimetry (TG). The polymers formed also exhibited a glass transition temperature of 2.6°C, as observed in differential scanning calorimetry (DSC) curves and dynamic-mech. anal. (DMA). This new monomer presents an alternative monomer to be used in 3D printing, in a similar manner to other vegetable oils such as soybean and linseed.

Journal of Polymer Research published new progress about 10287-53-3. 10287-53-3 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Ester, name is Ethyl 4-dimethylaminobenzoate, and the molecular formula is C11H15NO2, Formula: C11H15NO2.

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

Fernandez-Gonzalez, Miguel Angel published the artcileThe concept of substituent-induced force in the rationale of substituent effect, Synthetic Route of 10287-53-3, the publication is Journal of Chemical Physics (2021), 154(22), 224106, database is CAplus and MEDLINE.

Controlling the thermochem. and kinetics of chem. reactions is a central problem in chem. Among factors permitting this control, the substituent effect constitutes a remarkable example. Here, we develop a model accounting for the effect of a substituent on the potential energy surface of the substrate (i.e., substituted mol.). We show that substituents affect the substrate by exerting forces on the nuclei. These substituent-induced forces are able to develop a work when the mol. follows a given reaction path. By applying a simple mech. model, it becomes possible to quantify this work, which corresponds to the energy variation due to the effect of the substituent along a specific pathway. Our model accounts for the Hammett equation as a particular case, providing the first non-empirical scale for the σ and ρ constants, which, in the developed model, are related to the forces exerted by the substituents (σ) and the reaction path length (ρ), giving their product (σ · ρ) the well-known variation on the reaction energy due to the substituent. (c) 2021 American Institute of Physics.

Journal of Chemical Physics published new progress about 10287-53-3. 10287-53-3 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Ester, name is Ethyl 4-dimethylaminobenzoate, and the molecular formula is C11H15NO2, Synthetic Route of 10287-53-3.

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

Oliveira, Michelle Leal published the artcileLong-term bond strength of glass fiber post to composite resin does not depend on surface treatment with silane coupling agent or universal adhesive, Related Products of esters-buliding-blocks, the publication is International Journal of Adhesion and Adhesives (2021), 102931, database is CAplus.

This study evaluated the effect of glass fiber post (GFP) surface treatment with or without a silane coupling agent, associated with adhesive systems with or without silane in their composition, on the long-term bond strength to resin composite. Sixty GFPs (Whitepost DC number 2, FGM) were cleaned using 70% ethanol, and randomly divided into two groups, either with or without pretreatment with silane (Ceramic Primer, 3 M ESPE), for 60 s. Each group was further subdivided into three groups, according to the adhesive system applied over the GFP (n = 10): UAS (Scotchbond Universal, 3 M ESPE), E&R – etch-and-rinse adhesive system (Adper Single Bond Plus, 3 M ESPE), and a control group with no adhesive system. The GFPs were centralized in a cylindrical matrix, and a nanoparticulate resin composite (Filtek Supreme Ultra, 3 M ESPE) was inserted and photoactivated. After 48 h, the samples were sectioned in slices, two of which were immediately (48 h) submitted to the push-out bond strength test, and another two, after 6 mo of storage in water. The failure mode was evaluated with a stereomicroscope under 40x magnification, and classified using scores. Three-way ANOVA (α = 0.05) showed that the triple interaction of pretreatment with silane, use of adhesive and time period were significant (p = 0.019). After 48 h, the application of silane resulted in a significant increase in bond strength values, regardless of the adhesive application (p = 0.013), but this effect was no longer observed after 6 mo (p = 0.677). Application of UAS did not influence bond strength values, regardless of silane application or storage time (p > 0.05). As for E&R, significantly higher bond strength was observed after 6 mo, compared with 48 h (p = 0.040). When post silanization was performed with no adhesive system, there was no difference in bond strength between 48 h and 6 mo storage time (p > 0.05). When there was neither silanization, nor an adhesive system, a significantly higher bond strength was observed after 6 mo, compared with 48 h (p < 0.05). Most of the failure types were classified as mixed in both of the water storage time periods. The long-term bond strength of the GFP to composite resin did not depend on post surface treatment with silane, or application of either a UAS or a E&R system.

International Journal of Adhesion and Adhesives published new progress about 10287-53-3. 10287-53-3 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Ester, name is Ethyl 4-dimethylaminobenzoate, and the molecular formula is C11H15NO2, Related Products of esters-buliding-blocks.

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

Gutierrez Gonzalez, Jessica published the artcileLong PEO-based nanoribbons generated in a polystyrene matrix through reaction-induced microphase separation followed by a fast crystallization process, Recommanded Product: Ethyl 4-dimethylaminobenzoate, the publication is Soft Matter (2021), 17(8), 2279-2289, database is CAplus and MEDLINE.

A dispersion of elongated nanostructures with a high aspect ratio in polymer matrixes has been reported to provide a material with valuable properties such as mech. strength, barrier effect and shape memory, among others. In this study, we show the procedure to achieve a distribution of elongated crystalline nanodomains in a PS matrix employing the self-assembly of amphiphilic block copolymers (BCP). The selected BCP was polystyrene-block-polyethylene oxide (PS-b-PEO). It was dissolved at 10 wt% in a styrene (St) monomer and the blend was slowly photopolymerized over four days at room temperature, until the reaction was arrested by vitrification. This blend was initially homogeneous and nanostructuration took place in an early stage of the polymerization as a result of the microphase separation (MS) of PEO blocks. Due to its high tendency to crystallize, demixed PEO blocks crystallized almost concomitantly with MS triggering the growing of the nanostructures. Thus, the time window between the onset of crystallization and the vitrification of the matrix was almost four days, allowing all micelles to have the opportunity to couple to a growing nanostructure. As a result, a population of nanoribbons with average lengths surpassing 10μm dispersed in a PS matrix was obtained. It was demonstrated that these ribbon-like nanostructures are preserved as long as the heating temperature is located below the T_g of the matrix. If the material is heated above this temperature, softening of the matrix allows the breakup of the molten PEO nanoribbons due to Plateau-Rayleigh instability.

Soft Matter published new progress about 10287-53-3. 10287-53-3 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Ester, name is Ethyl 4-dimethylaminobenzoate, and the molecular formula is C11H15NO2, Recommanded Product: Ethyl 4-dimethylaminobenzoate.

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

Al-eesa, N. A. published the artcileRemineralizing fluorine containing bioactive glass composites, HPLC of Formula: 10287-53-3, the publication is Dental Materials (2021), 37(4), 672-681, database is CAplus and MEDLINE.

The objective was to investigate the mech. properties, fluoride release and apatite formation of resin based dental composites based on a fluoride containing Bioactive Glass (BG) with and without a silylating agent. A SiO₂-P₂O₅-CaO-SrO-Na₂O-CaF₂ BG was synthesized by the melt quench route. This glass and a com. available inert glass (IG) were incorporated into a light cured BisGMA-TEGMA resin. The composite resins were then evaluated in terms of their ability to form apatite by Fourier Transform IR spectroscopy (FTIR) and by SEM (SEM) following immersion in artificial saliva at pH 4 (AS4) and pH 7 (AS7). The experiments were performed with and without silylation of the BG. The compressive strength and flexural strength were determined after 1, 28 and 84 days of immersion in the AS4 and AS7 immersion media. The FTIR spectra of the BG composites exhibited split bands at approx. 560 and 600 cm^-1 corresponding to a apatite formation in the surface or on the surface under all immersion conditions. SEM showed the presence of a reacted layer of glass particles in the composite surface and the presence of a surface layer of apatite in AS7. The compressive strength and flexural strength were significantly higher for the silylated BG composites. The strengths of both silylated and non silylated BG composites and IG composites decreased upon immersion. BG composites exhibit reduced strengths upon immersion but still exhibit strengths comparable to existing composites after 84 days of immersion.

Dental Materials published new progress about 10287-53-3. 10287-53-3 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Ester, name is Ethyl 4-dimethylaminobenzoate, and the molecular formula is C11H15NO2, HPLC of Formula: 10287-53-3.

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

Gencoglu, Turkan published the artcileA Water Soluble, Low Migration, and Visible Light Photoinitiator by Thioxanthone-Functionalization of Poly(ethylene glycol)-Containing Poly(β-amino ester), Computed Properties of 10287-53-3, the publication is Macromolecular Chemistry and Physics (2022), 223(13), 2100450, database is CAplus.

A novel photoinitiator (PI) is described here for low ecol. impact, p(PEGDA575-TX): It is water soluble, polymerizable, thioxanthone (TX) functional, and is a one-component poly(ethylene glycol)-based poly(β-amino ester). The PI is synthesized in one step via classical aza-Michael addition reaction between poly(ethylene glycol) diacrylate (Mn = 575 D) and amine functionalized TX (2-(2-aminoethoxy)-9H-thioxanthen-9-one). It absorbs at ≈ 404 nm (ε = 14 000-44 309) in water and can photodecompose with or without additives such as Et 4-(dimethylamino)benzoate (EDB) and bis-(4-tert-butylphenyl)-iodonium hexafluorophosphate (Iod). Although it is an effective one-component visible light PI for free radical polymerization of di- and tri(meth)acrylates, EDB or Iod will be favorable for synergistic effect. p(PEGDA575-TX) has higher initiating reactivity, reducing ability of oxygen inhibition and migration stability compared to TX, which make it environmental friendly.

Macromolecular Chemistry and Physics published new progress about 10287-53-3. 10287-53-3 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Ester, name is Ethyl 4-dimethylaminobenzoate, and the molecular formula is C11H15NO2, Computed Properties of 10287-53-3.

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

Gencoglu, Turkan published the artcilePhotoinitiating systems based on poly(ethylene imine) for Michael addition and free radical photopolymerization, Application of Ethyl 4-dimethylaminobenzoate, the publication is Journal of Photochemistry and Photobiology, A: Chemistry (2021), 112959, database is CAplus.

Multifunctional polymeric photoinitiators with the ability of aza-Michael addition with acrylates, free radical polymerization of (meth)acrylates through type II photoinitiation and charge transfer complex (CTC) formation with iodonium salt (Iod) were prepared They were synthesized via aza-Michael addition reaction between branched poly(ethylene imine) (PEI, M_n =1800 g/mol), 2-acryloyloxy thioxanthone and tetra-Et vinylidene bisphosphonate or di-Et vinylphosphonate. Their structures were confirmed by ¹H NMR and FTIR spectroscopy. CTC formation between Iod (acceptor) and amines on PEI (donor) was confirmed by absorption shift to 440 nm in spectral anal. Photopolymerization kinetics were monitored by real time FTIR upon visible light exposure using LED @405 nm, whereas Michael addition reactivities of the photoinitiators were monitored without irradiation Excellent polymerization initiating performances were found and high final conversions were obtained. Results show that the CTCs formed at high concentrations of low-functionalized PEI allow polymerizations without light and increase polymerization efficiencies of Type II photoinitiation.

Journal of Photochemistry and Photobiology, A: Chemistry published new progress about 10287-53-3. 10287-53-3 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Ester, name is Ethyl 4-dimethylaminobenzoate, and the molecular formula is C11H15NO2, Application of Ethyl 4-dimethylaminobenzoate.

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

Mau, Alexandre published the artcileConcomitant initiation of radical and cationic polymerizations using new copper complexes as photoinitiators: Synthesis and characterisation of acrylate/epoxy interpenetrated polymer networks, Related Products of esters-buliding-blocks, the publication is European Polymer Journal (2021), 110457, database is CAplus.

Two new copper complexes were investigated in three-component visible light photoinitiating system for both radical and cationic polymerization under air. Their reactivity and efficiency have been compared with that of a highly efficient photoredox catalyst. The formation of acrylate/epoxy interpenetrated polymer networks were successfully performed through concomitant initiation of radical and cationic polymerization with low copper complex content upon either LED@405 nm or LED@455 nm irradiations. Several characterizations of the acrylate/epoxy IPNs final properties, such as the mech. properties, adhesion properties, shrinkage and swelling, indicated the possibilities to adapt or tune their properties compared to radical polymerization of TMPTA.

European Polymer Journal published new progress about 10287-53-3. 10287-53-3 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Ester, name is Ethyl 4-dimethylaminobenzoate, and the molecular formula is C11H15NO2, Related Products of esters-buliding-blocks.

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

Vasconcelos e Cruz, Joana published the artcileImproving Properties of an Experimental Universal Adhesive by Adding a Multifunctional Dendrimer (G-IEMA): Bond Strength and Nanoleakage Evaluation, Related Products of esters-buliding-blocks, the publication is Polymers (Basel, Switzerland) (2022), 14(7), 1462, database is CAplus and MEDLINE.

A vast number of adhesive formulations exist currently. However, available adhesives still have several drawbacks such as increased hydrophilicity, polymerization deficiency, potential cytotoxicity and limited monomer interdiffusion within dentin. To improve material properties, a Bisphenol A-free adhesive containing a novel dendrimer G(2)-isocyanatoethyl methacrylate (G-IEMA) in replacement of Bis-GMA was made and tested. Sound human molars were sectioned to expose mid-coronal dentin, which was bonded using four adhesives-Futurabond, Scotchbond Universal and experimentals EM1 and EM2. The exptl. adhesive EM2 contained G-IEMA, while EM1 had Bis-GMA. Groups were further allocated to two different adhesive strategies: etch-and-rinse (20 s etching) or self-etch. Immediate (24 h) microtensile bond strength to dentin (n = 5) was tested using a universal testing machine (1 mm/min, 5 kN; Shimadzu AGS-X Autograph, Tokyo, Japan), while the ultrastructure of the interface (n = 2) was assessed using SEM-energy dispersive spectroscopy (SEM-EDS). Nanoleakage expression was evaluated using silver nitrate penetration and posterior SEM-EDS anal. (n = 3). Linear mixed models/Generalized models were used for inferential statistics (5% significance level). Bond strength results did not depend on the adhesive choice, although differences were found between strategies (p < 0.001). Regarding nanoleakage, when applied in an etch-and-rinse mode, exptl. adhesives scored lower nanoleakage means than Futurabond and Scotchbond Universal. The novel adhesive shows interesting interfacial properties, with favorable nanoleakage results and a bond strength to dentin that matches current com. adhesives.

Polymers (Basel, Switzerland) published new progress about 10287-53-3. 10287-53-3 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Ester, name is Ethyl 4-dimethylaminobenzoate, and the molecular formula is C15H24S, Related Products of esters-buliding-blocks.

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