Tag: M.W=350-400

Floyd, James G. published the artcileLocating and quantifying carbon steel corrosion rates linked to fungal B20 biodiesel degradation, Safety of Methyl docosanoate, the main research area is carbon steel biodiesel corrosion rate Paecilomyces.

Fungi that degrade B20 biodiesel in storage tanks have also been linked to microbiol. influenced corrosion (MIC). A member of the filamentous fungal genus Paecilomyces and a yeast from the genus Wickerhamomyces were isolated from heavily contaminated B20 storage tanks from multiple Air Force bases. Although these taxa were linked to microbiol. influenced corrosion in situ, precise measurement of their corrosion rates and pitting severity on carbon steel was not available. In the experiments described here, we directly link fungal growth on B20 biodiesel to higher corrosion rates and pitting corrosion of carbon steel under controlled conditions. When these fungi were growing solely on B20 biodiesel for carbon and energy, consumption of FAME and n-alkanes was observed The corrosion rates for both fungi were highest at the interface between the B20 biodiesel and the aqueous medium, where they acidified the medium and produced deeper pits than abiotic controls. Paecilomyces produced the most corrosion of carbon steel and produced the greatest pitting damage. This study characterizes and quantifies the corrosion of carbon steel by fungi that are common in fouled B20 biodiesel through their metabolism of the fuel, providing valuable insight for assessing MIC associated with storing and dispensing B20 biodiesel. Biodiesel is widely used across the United States and worldwide, blended with ultra-low-sulfur diesel in various concentrations In this study, we were able to demonstrate that the filamentous fungus Paecilomyces AF001 and the yeast Wickerhamomyces SE3 were able to degrade fatty acid Me esters and alkanes in biodiesel, causing increases in acidity. Both fungi also accelerated the corrosion of carbon steel, especially at the interface of the fuel and water, where their biofilms were located. This research provides controlled, quantified measurements and the localization of microbiol. influenced corrosion caused by common fungal contaminants in biodiesel fuels.

Applied and Environmental Microbiology published new progress about Alkanes Role: TEM (Technical or Engineered Material Use), USES (Uses). 929-77-1 belongs to class esters-buliding-blocks, name is Methyl docosanoate, and the molecular formula is C23H46O2, Safety of Methyl docosanoate.

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

Feng, Xiaoxiao published the artcileEffect of soaking conditions on the formation of lipid derived free radicals in soymilk, Synthetic Route of 929-77-1, the main research area is soymilk fatty acid soaking; ESR; Extraction; Lipid radicals; Soaking; Soybean exudates; Soymilk.

Lipid derived free radical in soymilks were studied by combining 5,5-dimethyl-pyrroline-l-oxide (DMPO) spin trap, chloroform-methanol extraction and ESR (ESR) spectroscopy. Five lipid derived free radical adducts: DMPO-X·, DMPO-L·, DMPO-R·, DMPO-LOO·, and DMPO-RO· were presented in soymilks. The total amounts of spins increased as the soaking temperature increased from 4°C to 50°C and the soaking pH increased from 3 to 9 and in paralleled with the diffusion of soybean exudates to soaking water. Prolonged soaking of soybean at 50°C resulted in a higher signal intensity of DMPO-R· than that of DMPO-LOO·. Soybean lipoxygenases (LOXs) were responsible for the formation of lipid derived free radicals in soymilks. Soybean exudates affected the total amounts of lipid radicals in linoleic acid (LA) – LOX model system. The relative signal intensities of DMPO-R· and DMPO-LOO· were depended on the contents of soybean exudates in the system.

Food Chemistry published new progress about Fatty acids Role: ANT (Analyte), PRP (Properties), ANST (Analytical Study). 929-77-1 belongs to class esters-buliding-blocks, name is Methyl docosanoate, and the molecular formula is C23H46O2, Synthetic Route of 929-77-1.

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

Cui, Li published the artcilePhotoactive Thermoplastic Elastomers of Azobenzene-Containing Triblock Copolymers Prepared through Atom Transfer Radical Polymerization, Computed Properties of 135529-02-1, the publication is Macromolecules (2004), 37(19), 7097-7104, database is CAplus.

Atom transfer radical polymerization (ATRP) was used to prepare a new series of ABA triblock copolymers that are photoactive thermoplastic elastomers. The samples synthesized have the same rubbery midblock of poly(Bu acrylate) (PnBA) but differ in the d.p. of the end blocks of a methacrylate-based azobenzene-containing side-chain liquid crystalline polymer (Azo-SCLCP). The coupling between elasticity, liquid crystallinity and photoactivity imparts interesting features to this type of thermoplastic elastomers. When the solution-cast film is stretched at T > T_g of the Azo-SCLCP whose microdomains act as phys. cross-links, in contrast to conventional thermoplastic elastomers (such as styrene-butadiene-styrene triblock copolymer) that lose the elasticity, liquid crystalline microdomains can support part of the elastic extension of PnBA chains and, in the same time, deform to result in a long-range orientation of azobenzene mesogens. The liquid crystal orientation is retained in the relaxed film at T < T_g, which creates a thermoplastic elastomer whose glassy microdomains contain oriented azobenzene mesogens. Moreover, the reversible trans-cis photoisomerization of the azobenzene chromophore can be used to modulate the mech. induced orientation.

Macromolecules published new progress about 135529-02-1. 135529-02-1 belongs to esters-buliding-blocks, auxiliary class azo,Alkenyl,Benzene,Ester,Ether, name is 6-(4-((4-Methoxyphenyl)diazenyl)phenoxy)hexyl methacrylate, and the molecular formula is C23H28N2O4, Computed Properties of 135529-02-1.

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

Han, Dehui published the artcileCyclic Azobenzene-Containing Side-Chain Liquid Crystalline Polymers: Synthesis and Topological Effect on Mesophase Transition, Order, and Photoinduced Birefringence, Formula: C23H28N2O4, the publication is Macromolecules (Washington, DC, United States) (2010), 43(8), 3664-3671, database is CAplus.

A cyclic side-chain liquid crystalline polymer (SCLCP) bearing azobenzene mesogens, namely, poly{6-[4-(4-methoxyphenylazo)phenoxy]hexyl methacrylate} (PAzoMA), was successfully synthesized by using “click” cyclization of the linear polymer precursor with alkyne and azide end groups. Samples of cyclic-PAzoMA of various mol. weights were prepared, characterized, and studied in comparison with their linear counterparts. The results show that the topol. constraint arising from the tortuosity of the ring structure and the absence of chain ends in cyclic-SCLCPs affects profoundly the liquid crystalline (LC) phase transitions (temperature, enthalpy, and entropy) of mesogenic side groups and that this topol. effect is more prominent for smaller SCLCP rings. Moreover, the photoinduced anisotropy in films as a result of the trans-cis photoisomerization of azobenzene mesogens was investigated, and cyclic-PAzoMA was found to behave differently from linear-PAzoMA. On the one hand, the cyclic polymer exhibits a nonmonotonic rise and erasure of birefringence upon linearly and circularly polarized excitation (488 nm), resp., in contrast with the linear polymer displaying monotonic changes. On the other hand, unlike the linear polymer, the photoinduced orientation of azobenzene mesogens in cyclic-PAzoMA cannot be enhanced upon annealing in the nematic phase. All these manifestations of the topol. constraint suggest that cyclization offers a new way to change the coupling between mesogenic side groups and chain backbone of SCLCPs, and their interplay under the addnl. topol. effect may generate new behaviors that are of interest to be explored.

Macromolecules (Washington, DC, United States) published new progress about 135529-02-1. 135529-02-1 belongs to esters-buliding-blocks, auxiliary class azo,Alkenyl,Benzene,Ester,Ether, name is 6-(4-((4-Methoxyphenyl)diazenyl)phenoxy)hexyl methacrylate, and the molecular formula is C23H28N2O4, Formula: C23H28N2O4.

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

Wang, Guang published the artcilePreparation of Azobenzene-Containing Amphiphilic Diblock Copolymers for Light-Responsive Micellar Aggregates, Computed Properties of 135529-02-1, the publication is Macromolecules (2004), 37(24), 8911-8917, database is CAplus.

Diblock copolymers composed of a side-chain liquid crystalline azobenzene-containing polymethacrylate and poly(tert-Bu acrylate) (PAzoMA-b-PtBA) were prepared using atom-transfer radical polymerization (ATRP). After subsequent selective hydrolysis of PtBA yielding poly(acrylic acid) (PAA), amphiphilic diblock copolymers of PAzoMA-b-PAA were obtained. Aggregation of either PAzoMA or PAA block occurs in solvents selective for one of the blocks. Adding water into dioxane solution of PAzoMA-b-PAA forms micellar aggregates due to the hydrophobic PAzoMA block. Under alternating UV and visible light illumination, reversible changes in micellar aggregates, for both core-shell micelles and vesicles, took place as a result of the reversible trans-cis photoisomerization of azobenzene mesogens in PAzoMA.

Macromolecules published new progress about 135529-02-1. 135529-02-1 belongs to esters-buliding-blocks, auxiliary class azo,Alkenyl,Benzene,Ester,Ether, name is 6-(4-((4-Methoxyphenyl)diazenyl)phenoxy)hexyl methacrylate, and the molecular formula is C8H11NO, Computed Properties of 135529-02-1.

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

Itoh, Tomomichi published the artcileNonspherical Uniaxial Azobenzene Polymer Particles and Their Shape Changes under UV- or White-Light Irradiation for Stimuli-Response Applications, Application In Synthesis of 135529-02-1, the publication is ACS Applied Polymer Materials (2020), 2(6), 2485-2494, database is CAplus.

In this study, we developed azobenzene polymer particles showing several light-induced shape changes. Conventional azobenzene particles require exposure to polarized white or blue light on a substrate for shape elongation. First, the dispersion polymerization of 6-[4-(4′-methoxyphenylazo)phenoxy]hexyl methacrylate afforded unique oval or short cylindrical shapes with controlled sizes and narrow size distributions. Then, polarized optical microscopic observations and wide-angle X-ray diffraction measurements suggest that the azobenzene moiety formed a uniaxially orientated smectic-layered structure in the particles. Differential scanning calorimetric measurements indicated that the packing structures and particle shapes were closely related to each other. Finally, the particle shape was altered by the trans-cis photoisomerization of azobenzene accompanied by the deformation of the azobenzene packing structure. Interestingly, their shape anisotropy was increased by UV and white-light irradiation The particle shape was changed in a dispersed medium and on a substrate by unpolarized light. Consequently, the combination of a light source and site varied the light-induced shape changes of the azobenzene particles.

ACS Applied Polymer Materials published new progress about 135529-02-1. 135529-02-1 belongs to esters-buliding-blocks, auxiliary class azo,Alkenyl,Benzene,Ester,Ether, name is 6-(4-((4-Methoxyphenyl)diazenyl)phenoxy)hexyl methacrylate, and the molecular formula is C23H28N2O4, Application In Synthesis of 135529-02-1.

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

Tong, Zaizai published the artcileUnexpected crystalline memory effect in poly(L-lactide)-based block copolymers, Formula: C23H28N2O4, the publication is CrystEngComm (2020), 22(5), 979-985, database is CAplus.

The crystalline memory effect is frequently observed in polymer crystallization, but the melt structure remains unresolved. In this work, the preserved spherulites in the melt of poly(L-lactide)-based block copolymers are observed by polarized optical microscopy (POM) unexpectedly. These spherulites are not erased instantly on reaching the melting temperatures, but it takes tens of minutes at a designed melting temperature to completely erase the spherulites. These preserved spherulites in the melt, where some crystalline traces are lost but the Maltese cross appearance is still obvious, are possibly attributed to the long range of mol. orientation enhanced by microphase separation between two blocks. Moreover, these preserved spherulites have a significant effect on the subsequent crystallization, i.e. a faster radius growth rate and denser nucleation. This study highlights that a thermodynamically unstable structure can be fully preserved in a supercooled melt for a long time, which has never been reported elsewhere.

CrystEngComm published new progress about 135529-02-1. 135529-02-1 belongs to esters-buliding-blocks, auxiliary class azo,Alkenyl,Benzene,Ester,Ether, name is 6-(4-((4-Methoxyphenyl)diazenyl)phenoxy)hexyl methacrylate, and the molecular formula is C11H24O3, Formula: C23H28N2O4.

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

Wu, Jianxiang published the artcileNovel amphiphilic ABC 3-miktoarm star azo-copolymer with polypeptide chain: Synthesis, self-assembly and photo-responsive behavior, Quality Control of 135529-02-1, the publication is European Polymer Journal (2020), 109930, database is CAplus.

Well-defined amphiphilic ABC 3-miktoarm star terpolymer containing hydrophilic methoxy poly(ethylene glycol) (MPEG), hydrophobic poly[6-(4-methoxy-azobenzene-4′-oxy) hexyl methacrylate] (PAzoMA) and poly(γ-benzyl-L-glutamic acid) (PBLG) was synthesized by a combination of copper-mediated atom transfer radical polymerization (ATRP) and ring opening polymerization (ROP). MPEG was modified to bear two different functional groups, which were further modified to the initiator of ATRP and ROP for the preparation of the amphiphilic ABC-type 3-miktoarm star terpolymers (MPEG) (PAzoMA) (PBLG). The spindle-like micelles were formed from the amphiphilic 3-miktoarm star terpolymer through a solution self-assembly due to the rigid α-helical conformation of PBLG block and the π-π interaction between PBLG block with PAzoMA block in the star terpolymer. The investigation of the photo-isomerization behavior of (MPEG) (PAzoMA) (PBLG) in solution and in micellar solution showed that trans-cis isomerization in solution was quicker than that in micellar solution, and H- or J-aggregates of the azobenzene groups in the aggregates did not be observed On the basis of the exptl. results, the formation mechanisms of the spindle-like micelles were suggested and the obtained results may expand the self-assembly research field.

European Polymer Journal published new progress about 135529-02-1. 135529-02-1 belongs to esters-buliding-blocks, auxiliary class azo,Alkenyl,Benzene,Ester,Ether, name is 6-(4-((4-Methoxyphenyl)diazenyl)phenoxy)hexyl methacrylate, and the molecular formula is C27H39ClN2, Quality Control of 135529-02-1.

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

Sugiyama, Kazuo published the artcileThermal properties of liquid-crystalline polyitaconates with paired mesogens, COA of Formula: C23H28N2O4, the publication is Bulletin of the Chemical Society of Japan (1991), 64(5), 1715-17, database is CAplus.

2-Methylenesuccinates (itaconates) (I) having 2 4-methoxyazobenzene moieties as paired mesogenic groups were prepared I was radically homopolymerized and copolymerized with non-mesogenic monomer, dioctadecyl itaconate (DOI). Paired mesogenic homopolyitaconate exhibits a nematic phase and the copolymers of I with DOI also show a mesomorphic phase up to 25 mol% of DOI content. The enhancement of mesophase formation by paired mesogens is discussed.

Bulletin of the Chemical Society of Japan published new progress about 135529-02-1. 135529-02-1 belongs to esters-buliding-blocks, auxiliary class azo,Alkenyl,Benzene,Ester,Ether, name is 6-(4-((4-Methoxyphenyl)diazenyl)phenoxy)hexyl methacrylate, and the molecular formula is C10H15ClO3S, COA of Formula: C23H28N2O4.

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

Sugiyama, Kazuo published the artcileSynthesis and properties of macromonomer having azobenzene moieties as a mesogenic group, Product Details of C23H28N2O4, the publication is Kinki Daigaku Kogakubu Kenkyu Hokoku (1988), 31-5, database is CAplus.

4-Methoxy-4′-(6-methacryloyloxyhexyloxy)azobenzene was telomerized radically in the presence of HSCH₂CO₂H to give a telomer which was treated with glycidyl methacrylate to give the title macromonomer. DSC and polarization microscopy showed that the telomer was a nematic liquid crystal. Photoreversible cis-trans isomerization of the telomer was studied.

Kinki Daigaku Kogakubu Kenkyu Hokoku published new progress about 135529-02-1. 135529-02-1 belongs to esters-buliding-blocks, auxiliary class azo,Alkenyl,Benzene,Ester,Ether, name is 6-(4-((4-Methoxyphenyl)diazenyl)phenoxy)hexyl methacrylate, and the molecular formula is C9H9NO, Product Details of C23H28N2O4.

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