Tag: M.W=250-300

Sun, Changsheng published the artcileFormation of n-Hexane-in-DMF Nonaqueous Pickering Emulsions: ABC Triblock Worms versus AB Diblock Worms, Application of Dodecyl 2-methylacrylate, the main research area is formation hexane nonaqueous pickering emulsion triblock worm.

Nonaqueous Pickering emulsions exhibit promising applications in many industrial areas but have been relatively less studied in the past. In this study, n-hexane-in-DMF nonaqueous Pickering emulsions stabilized by core cross-linked copolymer worms with mixed shells are demonstrated for the first time. Core cross-linked copolymer worms with mixed shells were prepared by seeded reversible addition-fragmentation chain transfer (RAFT) quasi-solution polymerization Specifically, polystyrene-poly(4-vinylpyridine) (PS-P4VP) diblock copolymer worms were first prepared via RAFT-mediated dispersion polymerization in toluene under the given conditions using PS as both the macro-CTA and the stabilizer block. After the chem. crosslinking of P4VP cores, PS-P4VP diblock copolymer worms were chain-extended with LMA in DMF/toluene (1:9, weight ratio) mixed solvents, producing core cross-linked PS-P4VP-PLMA worms with PS/PLMA mixed shells. The as-prepared core cross-linked PS-P4VP-PLMA worms with mixed PS/PLMA shells were further utilized as Pickering emulsifiers for the generation of nonaqueous n-hexane-in-DMF Pickering emulsions. The emulsifying performances of mixed-shell copolymer worms were compared with those of their spherical and linear analogs with entirely identical chem. compositions as well as PS-P4VP diblock copolymer worm precursors, resp.

Langmuir published new progress about Chain transfer agents. 142-90-5 belongs to class esters-buliding-blocks, name is Dodecyl 2-methylacrylate, and the molecular formula is C16H30O2, Application of Dodecyl 2-methylacrylate.

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

Shin, Minjoong published the artcileBilayer-folded lamellar mesophase induced by random polymer sequence, Related Products of esters-buliding-blocks, the main research area is polyacrylic amphiphilic random copolymer radical RAFT gradient copolymerization kinetics; lamellar mesophase self assembly.

Randomness is perceived in two different extremes, in macroscopic homogeneity and local heterogeneity, but apparently far away from order. Here we show that a periodic order spontaneously arises from a binary random copolymer when self-assembly occurs in an ensemble containing > 1015 possible chain sequences. A Bernoullian distribution of hydrophilic and hydrophobic side chains grafted onto a linear backbone was constructed by random copolymerization When the polymer chains associate in water, a sequence matching problem occurs because of the drastic heterogeneity in sequence: this is believed to generate local curvature mismatches which deviate from the ensemble-averaged interfacial curvature. Periodic folding of the self-assembled bilayer stabilizes the curvature instability as recurring hinges. Reminiscent of chain-folded lamellae found in polymer crystallization, this new liquid crystalline mesophase, characterized as bilayer-folded lamellae, manifests itself as an anisotropically alignable birefringent hydrogel with structural hierarchy across multiple length scales.

Nature Communications published new progress about Chain transfer agents. 142-90-5 belongs to class esters-buliding-blocks, name is Dodecyl 2-methylacrylate, and the molecular formula is C16H30O2, Related Products of esters-buliding-blocks.

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

Park, Hyeon-Yong published the artcileDiscrimination of Platycodon grandiflorum and Codonopsis lanceolata using gas chromatography-mass spectrometry-based metabolomics approach, COA of Formula: C17H34O2, the main research area is Platycodon Codonopsis metabolomics gas chromatog mass spectrometry traditional medicine; Codonopsis lanceolata; Gas chromatography-mass spectrometry (GC-MS); Metabolite profilings; Multivariate statistical analysis; Platycodon grandiflorum.

Species of herbaceous flowering perennial plant of the family Campanulaceae such as Platycodon grandiflorum (P. grandiflorum) and Codonopsis lanceolata (C. lanceolata) widely used in traditional medicine to treat different diseases. In spite of different medicinal results after consumption of the plants, it is hard to distinguish between two of them, because of their similar morphol. characteristics. In this study, a gas chromatog.-mass spectrometry (GC-MS) – based metabolite profiling approach was performed and examined to discriminate tuberous roots of P. grandiflorum and C. lanceolate for medicinal purposes. Two basic approaches for sample preparation, headspace solid-phase microextraction (HS-SPME) and solvent extraction were adopted. Multivariate statistical techniques, such as orthogonal partial least-squares discriminant anal. (OPLS-DA) plots showed significant differences between P. grandiflorum and C. lanceolata for polar primary and volatile organic metabolites. A number of potential candidates were suggested as the chemomarkers for discrimination of two plants.

Talanta published new progress about Codonopsis lanceolata. 41114-00-5 belongs to class esters-buliding-blocks, name is Ethyl pentadecanoate, and the molecular formula is C17H34O2, COA of Formula: C17H34O2.

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

DiMagno, Theodore J. published the artcileNitrobenzene “”Caged”” Compounds as Irreversible Photoreductants: A Rational Approach to Studying Photoinduced Intermolecular Electron-Transfer Reactions in Proteins, Recommanded Product: Methyl 2-(4,5-dimethoxy-2-nitrophenyl)acetate, the main research area is nitrobenzene caged compound photoreductant.

Nitrobenzene “”caged”” compounds are well-known for their use in delivering biol. active substrates to a reaction mixture after photoexcitation. We have discovered that they also behave as photoreductants from the triplet state after photoexcitation. To explore the properties of these newly discovered photoreductants, a series of substituted nitrobenzene derivatives have been synthesized. These nitrobenzene derivatives exhibit many desirable characteristics suitable for the physiol. photoreduction of different proteins, and examples are shown for the photoreduction of cytochrome c and other heme proteins. The observed rate constant for photoreduction of cytochrome c, kobs, ranges from 300 to 36,000 s-1 for the various nitrobenzene derivatives PH and ionic strength experiments are consistent with a bimol. reaction wherein the photoreductant and the protein form an electrostatic complex prior to electron transfer. A kinetic model for this bimol. reaction is described and simulations of the exptl. data for the photoreductant 4,5-dimethoxy-2-nitrophenylacetic acid (DMNPAA) yield an inherent unimol. electron-transfer rate constant (ket) of 14,600 s-1 for the photoreduction of cytochrome c at pH 6.6.

Journal of Physical Chemistry published new progress about Myoglobins Role: RCT (Reactant), RACT (Reactant or Reagent). 2982-53-8 belongs to class esters-buliding-blocks, name is Methyl 2-(4,5-dimethoxy-2-nitrophenyl)acetate, and the molecular formula is C11H13NO6, Recommanded Product: Methyl 2-(4,5-dimethoxy-2-nitrophenyl)acetate.

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

Estrada-Ramirez, Alba Nidia published the artcilePoly(n-alkyl methacrylate)s as Metallocene Catalyst Supports in Nonpolar Media, Application of Dodecyl 2-methylacrylate, the main research area is polyalkyl methacrylate metallocene catalyst nonpolar media.

In this work, poly(alkylmethacrylates) based on poly(n-alkyl methacrylate)s (PnAMAs), i.e., poly(hexyl methacrylate) (PHMA), poly(lauryl methacrylate) (PLMA), and poly(stearyl methacrylate) (PSMA), with similar molar masses (Mn), are synthesized via reversible addition-fragmentation chain transfer technique using a high-throughput approach. Analyses by dynamic light scattering (DLS) of PnAMAs in nonpolar solvents show the presence of nanoparticles distributions (unimers or single chains). Interactions of methylaluminoxane (MAO) and MAO/metallocene compounds with PnAMA nanoparticles, lead to self-assembled micellar-like structures useful as “”nanoreactors”” for coordination polymerizations of ethylene. The inverse micellar-like structures of the three kinds of polymethacrylates, formed in the presence of MAO are confirmed by DLS experiments and by transmission electron microscopy using energy dispersive spectrometry analyzer, in dyed PnAMAs/MAO samples. The encapsulation of the metallocene catalyst into the PSMA/MAO nanoparticles reveals stable catalytic systems that have a clear effect on the morphol. of the polyethylenes synthesized through this method.

Macromolecular Chemistry and Physics published new progress about Aluminoxanes, Me Role: CAT (Catalyst Use), USES (Uses) (MAO). 142-90-5 belongs to class esters-buliding-blocks, name is Dodecyl 2-methylacrylate, and the molecular formula is C16H30O2, Application of Dodecyl 2-methylacrylate.

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

Xu, Liyun published the artcileFabrication of fluorine-free, comfortable and wearable superhydrophobic fabrics via capacitance coupled plasma with methyl side-chain lauryl methacrylate coatings, Recommanded Product: Dodecyl 2-methylacrylate, the main research area is wearable superhydrophobic fabric lauryl methacrylate coating.

Superhydrophobic fabrics show great potential for use in functional gear, military clothing, and other applications; however, the introduction of toxicity and degraded wearing comfort restrict their applications. In this work, superhydrophobic fabrics with excellent wearing comfort have been prepared by coating of fluorine-free lauryl methacrylate (LMA) and subsequent crosslinking via radio-frequency capacitance coupled plasma (CCP). The treated cotton fabric demonstrated excellent superhydrophobicity and excellent wearing comfort. Due to the reactions between cotton and LMA and the crosslinking of LMA under plasma treatment, the LMA-coated cotton (cotton-g-LMA) fabric is durable enough to resist phys. rubbing (1500 cycles), washing (45 cycles), UV radiation ageing (48 h) and boiling water ageing (10 h). More importantly, the plasma treatment exerted little influence on the comfort of the cotton fabrics. Addnl., this method could be applied to various cellulose fabrics, e.g., cotton, ramie and viscose materials. The facile and scalable method presented here paves the way for the design of fluorine-free, comfortable and wearable superhydrophobic fabrics.

Progress in Organic Coatings published new progress about Cotton textiles (plasma treated, grafted with PLMA or PDMS). 142-90-5 belongs to class esters-buliding-blocks, name is Dodecyl 2-methylacrylate, and the molecular formula is C16H30O2, Recommanded Product: Dodecyl 2-methylacrylate.

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

Korzhikova-Vlakh, Evgenia G. published the artcileSome factors affecting pore size in the synthesis of rigid polymer monoliths: Theory and its applicability, Product Details of C16H30O2, the main research area is rigid polymer monolith affecting pore size synthesis.

Macroporous monoliths represent now widely used materials whose successful application strongly depends on their characteristics. Among those the average pore size is one of the key parameters. In this paper, we consider the applicability of theor. calculations for the selection of appropriate porogens to generate the materials with required average pore size. A set of macroporous poly(meth)acrylate monoliths was synthesized via thermo- and photo-initiated free radical polymerization and characterized in regards to their average pore size. Addnl., the difference in solubility parameters as well as Hansen’s solubility parameter distance between monomers and porogens were calculated for each polymerization mixture using Hildebrand’s and Hansen’s solubility theories. The theor. predications and exptl. data were compared and analyzed to establish the applicability of theor. calculations to previse average pore size for different systems. It was found that Hildebrand’s theory seems to be poorly appropriate as universal tool, while Hansen’s theor. approach explained better the efficiency of solvents as porogens. The application of oligomers and polymer solutions due to the increase of viscosity as well as the variation of crosslinker amount in the monomer system can be singled out as Hansen’s theory limitations at the prediction of the average pore size.

Journal of Applied Polymer Science published new progress about Polyoxyalkylenes Role: NUU (Other Use, Unclassified), USES (Uses). 142-90-5 belongs to class esters-buliding-blocks, name is Dodecyl 2-methylacrylate, and the molecular formula is C16H30O2, Product Details of C16H30O2.

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

Liu, Xiaoyan published the artcileEffect of ageing process on carcinogen ethyl carbamate (EC), its main precursors and aroma compound variation in Hakka Huangjiu produced in southern China, Related Products of esters-buliding-blocks, the main research area is hakka huangjiu ethyl carbamate myristate citrulline aging temperature China.

Summary : Wine ageing is of great importance to the quality and organoleptic properties of Huangjiu. The aim of the present work was to investigate the effect of ageing temperature on the content changes in Et carbamate (EC) and its precursors including citrulline, arginine, ornithine and urea in Hakka Huangjiu. Aroma compound changes were also detected using headspace solid-phase microextraction coupled with gas chromatog. spectrometry. Results indicated that with the increase in ageing temperature, citrulline and EC concentrations increased, whereas arginine and ornithine concentrations decreased. Urea was decreased slightly from 4 to 20 °C while increased at 37 °C. Pearson test demonstrated that ageing temperature had significant correlation with EC and arginine. The concentrations of aroma compounds, especially esters, alcs., acids and heterocyclic compounds were different in different ageing temperatures Ageing temperature of Hakka Huangjiu was suggested setting in a lower temperature as for strictly controlling contents of urea and citrulline, as well as EC.

International Journal of Food Science and Technology published new progress about pH Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 41114-00-5 belongs to class esters-buliding-blocks, name is Ethyl pentadecanoate, and the molecular formula is C17H34O2, Related Products of esters-buliding-blocks.

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

Schena, Tiago published the artcileUpgrading of coconut fibers Bio-Oil: An investigation By GcxGc/Tofms, Synthetic Route of 41114-00-5, the main research area is coconut fiber bio oil Gc Tofms.

Pyrolysis of agroindustrial waste is an important way to add value to this material avoiding its discard in the environment. However, when residues are derived from oilseeds or similar, it is possible to find a large amount of fatty acid derivatives in the biomass and later in bio-oil composition These compounds are not adequately thermo-degraded in pyrolysis processes, reducing the quality. Another common compound class and with a high added value present in bio-oils are phenols. In this work two forms of upgrading processes were performed in coconut fiber pyrolysis process. One of them is the alk. extraction of coconut fiber bio-oil in order to produce a high acidic and a neutral fraction. The other upgrading process is a biomass pretreatment before the pyrolysis, using two different extraction techniques (Soxhlet and ultrasound). The two processes proved to be efficient and complimentary: in the first case, there was the pre-concentration of the phenols in a single fraction and in the second one, a great part of the fatty acids derivatives were removed from the bi-oil. These results indicate that the two techniques can be used to improve the quality of bio-oil produced by removing the free fatty acids from biomass and isolating compounds with high added value (in the case of phenols).

Journal of Environmental Chemical Engineering published new progress about Acids Role: ANT (Analyte), PRP (Properties), ANST (Analytical Study). 41114-00-5 belongs to class esters-buliding-blocks, name is Ethyl pentadecanoate, and the molecular formula is C17H34O2, Synthetic Route of 41114-00-5.

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

Nagre, R. D. published the artcileSynthesis and assessment of a hydrophobically associating heteropolymer in water-based mud, HPLC of Formula: 142-90-5, the main research area is acrylamide HEMA lauryl methacrylate AMPS copolymer drilling fluid.

Water-soluble polymers can be used as key ingredients of both drilling fluids for virgin fields and polymer-enhanced oil recovery in underperforming reservoirs. The efficacy of hydrophobically associating heteropolymer (HAH-polymer) as an agent for petroleum resource recovery was examined in this study. The hydrophobically associating heteropolymer (HAH-polymer) comprising acrylamide, sodium 2-acrylamido-2-methylpropanesulfonate, hydroxyethyl methacrylate and lauryl methacrylate was synthesized in micellar medium by free-radical polymerization The hydrophobically associating heteropolymer (HAH-polymer) was characterized by FTIR and 1H NMR spectral analyses. The effects of temperature, pH and shear on the solution behavior of the HAH-polymer were also examined Rheol. and fluid loss properties of HAH-polymer-incorporated water-based drilling fluids were assessed. The HAH-polymer improved the thermal stability between 25 and 160° of the drilling mud and maintained mud fluid loss of 8.4-8.6 cm3 compared with the polymer-free blank of 43.5-107.0 cm3. In a salt-contaminated mud, the heteropolymer enhanced rheol. properties and significantly reduced API filtration loss to 7.6-8.8 cm3 after hot aging between 25 and 150°. Under high temperature-high pressure filtration testing of muds, the HAH-polymer demonstrated excellent fluid loss reduction by providing about eightfold fluid loss control (14.7 cm3) compared to the polymer-free blank (113.2 cm3) at 150°.

Chemical Papers published new progress about Bentonite Role: TEM (Technical or Engineered Material Use), USES (Uses). 142-90-5 belongs to class esters-buliding-blocks, name is Dodecyl 2-methylacrylate, and the molecular formula is C16H30O2, HPLC of Formula: 142-90-5.

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