2478-10-6Relevant articles and documents
Enzyme-induced formation of thermoreversible micellar gels from aqueous solutions of multiresponsive hydrophilic ABA triblock copolymers
Woodcock, Jeremiah W.,Jiang, Xueguang,Wright, Roger A. E.,Zhao, Bin
, p. 5764 - 5775 (2011)
We report on the synthesis of thermo- and enzyme-responsive hydrophilic ABA triblock copolymers, poly(ethoxydi(ethylene glycol) acrylate-co-4- ((dihydroxyphosphoryl)oxy)butyl acrylate)-b-poly(ethylene oxide)-b- poly(ethoxydi(ethylene glycol) acrylate-co-4-((dihydroxyphosphoryl)oxy)butyl acrylate) (P(DEGEA-co-OPBA)-b-PEO-b-P(DEGEA-co-OPBA)), and the enzyme-induced formation of thermoreversible micellar gels from their moderately concentrated aqueous solutions at 37 °C. PDEGEA is a thermosensitive water-soluble polymer with a lower critical solution temperature (LCST) at 9 °C in water. The block copolymers were prepared by atom transfer radical polymerization of DEGEA and 4-((di-tert-butoxyphosphoryl)oxy)butyl acrylate and subsequent removal of tert-butyl groups. To seek optimal conditions for enzymatic gelation of aqueous solutions of triblock copolymers, a study of dephosphorylation of a random copolymer P(DEGEA-co-OPBA) by acid phosphatase in water at 37 °C was carried out. The time for the solution to turn cloudy was found to decrease with the decrease of pH from 5.48 to 4.70 and level off from pH 4.39 to 4.23. The cleavage of phosphate groups made the polymer less hydrophilic and decreased the LCST from above to below 37 °C. Therefore, pH 4.4 was selected to conduct the enzyme-induced gelation of 7.9 wt % aqueous solutions of P(DEGEA-co-OPBA)-b-PEO-b-P(DEGEA-co-OPBA). The gelation processes were monitored by rheological measurements; the sol-gel transition temperature decreased and the gel strength increased with the increase of reaction time. The gels formed were thermoreversible; lowering temperature converted the gels to free-flowing liquids. From 1H and 31P NMR spectroscopy analysis, the degree of dephosphorylation was high. The formation of three-dimensional micellar network gels stemmed from the thermosensitive properties of the resultant dephosphorylated triblock copolymers, which was confirmed by a dynamic light scattering study. At a slightly higher pH (4.67), the enzyme-induced gelation was significantly slower, consistent with the observation of the effect of pH on dephosphorylation of the random copolymer by acid phosphatase.
Runge-Kutta analysis for optimizing the Zn-catalyzed transesterification conditions of MA and MMA with diols to maximize monoesterified products
Akebi, Shin-Ya,Kato, Taito,Mashima, Kazushi,Nagae, Haruki,Oku, Tomoharu,Yonehara, Koji
, p. 6975 - 6986 (2021/11/17)
Terminal hydroxylated acrylates and methacrylates were prepared by catalytic transesterification of acrylates and methacrylates with diols catalyzed by a system of a tetranuclear zinc alkoxide, [Zn(tmhd)(OMe)(MeOH)]4 (1a), with 4 equiv. of 2,2′-bipyridine (L1). The reaction time to reach the equilibrium state was analyzed by kinetic studies and a curve-fitting analysis based on the Runge-Kutta method for optimizing the best reaction conditions for mono-esterification. In addition to these kinetic analyses, DFT calculations estimated a proposed mechanism of the catalytic transesterification. This journal is
Acrylate monomer having hydrophilic end group and a method for preparing the same
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Paragraph 0120-0122, (2021/11/02)
More particularly, the present invention relates to an acrylate monomer having a high-purity hydrophilic terminal group which does not contain unreacted 1 water or undesirable by-products, and a method for producing the acrylate monomer. These acrylate monomers are substantially free of polymerization inhibitors. Chemical Formula 1. In Chemical Formula 1, R. 1 Chem. R. 2 Chem. R. 3 May be H, or linear, branched or cyclic C, independently of each other. 1 -C12 alkyl group. R4 Is linear, branched or cyclic C. 1 -C12 alkyl Or C1 -C12 It is alkoxy group, wherein alkyl group carbon atoms can be unsubstituted or substituted with oxygen atoms, n Is an integer selected from 1 and 10.
Synthesis method of 4-hydroxy butyl acrylate
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Paragraph 0043; 0046; 0047; 0050; 0051; 0054, (2021/11/21)
The invention belongs to the field of synthesis process development of photocuring diluents, and particularly relates to a synthesis method of 4-hydroxy butyl acrylate. The synthesis method of the 4-hydroxy butyl acrylate provided by the invention comprises the following steps: carrying out dehydration condensation cyclization on 1, 4-butanediol and acrolein under the catalytic action of a strong acid catalyst to obtain 2-vinyl-1, 3-dioxoheptacyclic ring, and then carrying out oxidation ring opening on the 2-vinyl-1, 3-dioxoheptacyclic ring under the action of ozone to obtain the 4-hydroxy butyl acrylate. The synthesis method of 4-hydroxy butyl acrylate provided by the invention has the advantages that the method is simple and convenient, the efficiency is high, and the obtained 4-hydroxy butyl acrylate product is high in purity and hydroxyl value, so that popularization and application of the synthesis method of 4-hydroxy butyl acrylate are facilitated.
Oxidative Deprotection of p-Methoxybenzyl Ethers via Metal-Free Photoredox Catalysis
Ahn, Deok Kyun,Kang, Young Woo,Woo, Sang Kook
, p. 3612 - 3623 (2019/03/11)
An efficient and greener deprotection method for p-methoxybenzyl (PMB) ethers using a metal-free visible light photoredox catalyst and air and ammonium persulfate as the terminal oxidants is presented. Various functional groups and protecting groups were tolerated in the developed method to achieve good to excellent yields in short reaction times. Significantly, the developed method was compatible with PMB ethers derived from primary, secondary, and tertiary alcohols and a gram-scale reaction. Mechanistic studies support a proposed reaction mechanism that involves single electron oxidation of the PMB ether.
Method for preparing 4-hydroxybutyl acrylate by means of extraction and separation
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Paragraph 0033-0076, (2019/01/14)
The invention relates to a method for preparing 4-hydroxybutyl acrylate by means of extraction and separation. The method is characterized by comprising the following steps: (1) putting 1, 4-butanediol, a catalyst, a polymerization inhibitor and a solvent into a reactor to form mixed liquid; (2) slowly heating and controlling the temperature to be 40-60 DEG C, and dropwise adding acrylic acid containing a certain amount of the polymerization inhibitor for 30-50min at the temperature; (3) continuously and slowly heating and controlling the temperature to be 100-120 DEG C, carrying out a refluxreaction for 2-5h reaction and then finishing the reaction; (4) adding aqueous solution into the mixed liquid and then adding a certain amount of extractant for firstly extracting 1, 4-butanediol diacrylate from an aqueous phase; (5) extracting the 4-hydroxybutyl acrylate from the aqueous phase by using an extractant; (6) distilling under reduced pressure to obtain a finished product. The productof the method is colorless and does not need to be faded, so that the aftertreatment process is simpler, and the quality and yield of the final product are increased.
A through extraction separation preparation 4 - acrylic acid [...] production process and apparatus (by machine translation)
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Paragraph 0005; 0028, (2019/01/14)
The invention relates to a method for extracting and separating preparation 4 - acrylic acid [...] production process and apparatus, will be 1, 4 - butanediol and acrylic acid in the catalyst, and the presence of a solvent polymerization reaction, the major product is 4 - acrylic acid [...] and 1, 4 - butanediol diacrylate; selects the first extracted from the aqueous phase in the cyclohexane 1, 4 - butanediol diacrylate, then choosing methylene chloride from the aqueous phase extraction 4 - acrylic-acid [...], finally distilled under reduced, to make the finished product. The beneficial effect of the present invention is: through the reaction section and separation section of each component physical property, content and the like, has designed a set of process flow, and through the process flow to obtain the final product 4 - acrylic acid [...], purity in full compliance with the requirements of industrial production. The technique of the invention is simple, the required low energy consumption, low production cost, the prepared product having high purity and yield of the product is high, good quality. (by machine translation)
METHOD FOR PRODUCING HYDROXYALKYL(METH)ACRYLIC ACID ESTER
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Paragraph 0073; 0076; 0077, (2018/01/11)
PROBLEM TO BE SOLVED: To provide a production method that permits efficient production of a hydroxyalkyl (meth)acrylate of high purity without necessitating a troublesome purification step.SOLUTION: The production method for a hydroxyalkyl (meth)acrylate comprises (meth)acrylating a vinyl ether-containing alcohol by a transesterification method to obtain a vinyl ether-containing (meth)acrylate, carrying out a devinylation reaction in the presence of an acid catalyst and water, and subsequently carrying out a deacetalization reaction by further adding water.
PROCESS FOR PREPARING 4-HYDROXYBUTYL ACRYLATE
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Paragraph 0455; 0456; 0457; 0458; 0459; 0460, (2015/04/22)
A process for preparing 4-hydroxybutyl acrylate by transesterifying an alkyl acrylate with 1,4-butanediol in the presence of a dialkyltin oxide such that each of the alkyl groups has 4 to 8 carbon atoms, characterized in that the amount of the dialkyltin oxide is adjusted to 0.00001 to 0.01 moles per one mole of the alkyl acrylate.
Synthesis of glycopolymers at various pendant spacer lengths of glucose moiety and their effects on adhesion, viability and proliferation of osteoblast cells
Trinadh, Mummuluri,Kannan, Govindaraj,Rajasekhar, Tota,Sesha Sainath, Annadanam V.,Dhayal, Marshal
, p. 37400 - 37410 (2014/11/27)
Multivalent glycopolymers containing three different glucose pendant spacer lengths in the polymer backbone having various weight percentages of covalently bonded glucose moieties were obtained by the deacetylation of acetylated polymers synthesized via reversible addition-fragmentation chain transfer (RAFT) process. This allowed us to control the packing density of the glucose moieties in one unit of the glycopolymer. The biological responses of these macromolecules in terms of cytotoxicity of glucose moieties at various spacer lengths and concentrations were investigated without perturbing the intrinsic chemical nature of functional moiety by employing in vitro osteoblast cells. Osteoblast cell adhesion, viability and proliferation response with synthesized glycopolymers revealed that the higher glycopolymer concentration tolerance limit was associated with an increase in pendant spacer length of glucose moiety in the glycopolymer. the Partner Organisations 2014.