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公开(公告)号：US20220033556A1
公开(公告)日：2022-02-03
申请号：US17277125
申请日：2019-09-17
Inventor： Xiaoshuang FENG , Jobi VARGHESE , Yves GNANOU , Nikos HADJICHRISTIDIS , Mingchen JIA , Dhanya AUGUSTINE
IPC: C08F293/00 , C08G65/12 , C08G65/26 , C08G63/664 , C08G64/34
Abstract: Embodiments include degradable polyethers comprising ester units from a cyclic ester or carbonate units from carbon dioxide incorporated into a poly(ethylene oxide) backbone or a multifunctional core of a degradable polyether star. Embodiments include methods of forming a degradable polyether comprising contacting an ethylene oxide monomer with a lactide monomer or carbon dioxide in the presence of an alkyl borane and an initiator. Embodiments include methods of forming degradable polyether stars comprising contacting a diepoxide monomer with carbon dioxide and/or a cyclic ester in the presence of an initiator and a first amount of an alkyl borane to form a multifunctional core comprising degradable carbonate linkages and/or degradable ester linkages, and contacting the multifunctional core with an ethylene oxide monomer in the presence of a second amount of an alkyl borane to form arms of a polyether attached to the degradable multifunctional core.
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公开(公告)号：US20190390008A1
公开(公告)日：2019-12-26
申请号：US16563269
申请日：2019-09-06
Inventor： Xiaoshuang FENG , Dongyue ZHANG , Yves GNANOU , Nikolaos HADJICHRISTIDIS
Abstract: Embodiments of the present disclosure describe a method of making a polycarbonate, comprising contacting one or more cyclic monomers and carbon dioxide in the presence of one or more of a Lewis acid catalyst, an initiator, and an ionic liquid; and agitating, sufficient to copolymerize the one or more cyclic monomers and carbon dioxide to create a polycarbonate. Embodiments of the present disclosure further describe a method of controlling a polymer composition, comprising contacting one or more cyclic monomers and carbon dioxide; adjusting an amount of one or more of a Lewis acid catalyst, an ionic liquid, and an initiator in the presence of the one or more cyclic monomers and carbon dioxide, sufficient to selectively modify a resulting polycarbonate; and agitating, sufficient to copolymerize the one or more cyclic monomers and carbon dioxide to create the polycarbonate.
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公开(公告)号：US20180186930A1
公开(公告)日：2018-07-05
申请号：US15571631
申请日：2016-06-15
Inventor： Xiaoshuang FENG , Dongyue ZHANG , Yves GNANOU , Nikolaos HADJICHRISTIDIS
Abstract: Embodiments of the present disclosure describe a method of making a polycarbonate, comprising contacting one or more cyclic monomers and carbon dioxide in the presence of one or more of a Lewis acid catalyst, an initiator, and an ionic liquid; and agitating, sufficient to copolymerize the one or more cyclic monomers and carbon dioxide to create a polycarbonate. Embodiments of the present disclosure further describe a method of controlling a polymer composition, comprising contacting one or more cyclic monomers and carbon dioxide; adjusting an amount of one or more of a Lewis acid catalyst, an ionic liquid, and an initiator in the presence of the one or more cyclic monomers and carbon dioxide, sufficient to selectively modify a resulting polycarbonate; and agitating, sufficient to copolymerize the one or more cyclic monomers and carbon dioxide to create the polycarbonate.
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4.发明申请公开(公告)号：US20180118884A1
公开(公告)日：2018-05-03
申请号：US15566473
申请日：2016-04-13
Inventor： Yves GNANOU , Debasis PATI , Xiaoshuang FENG , Nikolaos HADJICHRISTIDIS
CPC classification number: C08G64/323 , C07H1/00 , C07H13/12 , C08G64/0208
Abstract: Provided herein are methods for synthesizing cyclic carbonates, glycocarbonates, and polyglycocarbonates by reacting polyol glycans with carbon dioxide. Synthesis can include selective polycondensation of polyol glycan hydroxyl moieties.
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公开(公告)号：US20230242699A1
公开(公告)日：2023-08-03
申请号：US17923395
申请日：2021-05-06
Inventor： Xiaoshuang FENG , Mingchen JIA , Yves GNANOU
IPC: C08G18/00
CPC classification number: C08G18/003
Abstract: The present disclosure features materials and methods for synthesizing polycarbamates via chain-growth copolymerization in the presence of a Lewis acid of a first reactant having a oxirane or thiirane moiety and at least one heteroallene reactant, wherein a first heteroallene reactant is an isocyanate or an isothiocyanate. Also featured are polycarbamate copolymers and terpolymers according to formula (I): (I), wherein An is a halogen atom or a carboxylate or alkoxide moiety; each X and X′ is independently an oxygen or a sulfur atom; each R1 and R2 is independently a hydrogen atom or an alkyl group including linear, branched, saturated, unsaturated, aromatic, cyclic alkyl groups, and heteroatom-containing alkyl groups, R3 is an electron deficient group, m and o are independently selected from integers ≥ 1 and n is 0 or an integer ≥ 1. Both X and X′ can be the same or X and X′ can be different.
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Patent Agency Ranking
公开(公告)号：US20210070932A1
公开(公告)日：2021-03-11
申请号：US17051292
申请日：2019-05-17
Inventor： Xiaoshuang FENG , Naganatha PATIL , Caroline LUCIANI , Yves GNANOU , Nikos HADJICHRISTIDIS
Abstract: Supported onium salts used as initiators for the synthesis of polycarbonates by copolymerization of carbon dioxide with epoxides are described. Embodiments of the present disclosure describe initiators comprising an insoluble portion including an onium cation attached to an insoluble support; and an anion, wherein the anion is a counter-ion to the onium cation. Embodiments further describe methods of making polycarbonates using the initiator, methods of making initiators, and the like.
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公开(公告)号：US20220010040A1
公开(公告)日：2022-01-13
申请号：US17293339
申请日：2019-11-14
Inventor： Xiaoshuang FENG , Prakash ALAGI , Yves GNANOU , Nikos HADJICHRISTIDIS
IPC: C08F8/00 , C08F2/38 , C08F220/14 , C08F212/08 , C08F218/08 , C08F226/10 , C08K5/39 , C08K5/38 , C08K5/55
Abstract: Embodiments of the present disclosure describe a method of removing an end group from a polymer comprising contacting a polymer having a thiocarbonylthio end group, or a solution containing such a polymer, with an excess of a borane compound in the presence of oxygen. Embodiments of the present disclosure further describe a method of polymerization comprising contacting one or more monomers with an initiator and a chain transfer agent to form a polymer having a thiocarbonylthio end group in a reaction solution and contacting the polymer with a borane compound in the presence of oxygen to remove the thiocarbonylthio end group from the polymer.
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公开(公告)号：US20210340291A1
公开(公告)日：2021-11-04
申请号：US17255648
申请日：2019-07-16
Inventor： Konstantinos NTETSIKAS , Georgios POLYMEROPOULOS , Georgios ZAPSAS , Panagiotis BILALIS , Yves GNANOU , Nikolaos HADJICHRISTIDIS
IPC: C08F112/08 , C08F297/04
Abstract: Embodiments of the present disclosure describe a method of synthesizing a polymer comprising contacting a first monomer and an organolithium initiator in a nonpolar solvent and adding a promoter to the nonpolar solvent to polymerize the first monomer. Embodiments of the present disclosure further describe a method of synthesizing a polymer comprising contacting a first monomer and an organolithium initiator in a nonpolar solvent, adding a promoter to the nonpolar solvent to polymerize the first monomer, and adding a second monomer to the nonpolar solvent to polymerize the second monomer.
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公开(公告)号：US20180051134A1
公开(公告)日：2018-02-22
申请号：US15803011
申请日：2017-11-03
Inventor： Yahya ALZAHRANY , Xiaoshuang FENG , Senthil BOOPATHI , Dongyue ZHANG , Nikolaos HADJICHRISTIDIS , Yves GNANOU
CPC classification number: C08G64/34 , C08G64/32 , C08G81/00 , C08K5/057 , C08K5/19 , C08K5/53 , C08K5/5399
Abstract: Embodiments of the present disclosure describe initiating systems comprising an activator and an initiator, wherein the activator includes an alkyl borane or alkyl aluminum, wherein the initiator includes an organic cation and either an alkali metal or a compound containing an active protic hydrogen. Embodiments of the present disclosure further describe methods of making a polycarbonate comprising contacting a cyclic monomer and carbon dioxide in the presence of an activator and an initiator to form a polycarbonate, wherein the catalyst is one or more of an alkyl borane and alkyl aluminum, wherein the initiator includes an organic cation and either an alkali metal or a compound containing an active protic hydrogen.
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公开(公告)号：US20220363823A1
公开(公告)日：2022-11-17
申请号：US17620360
申请日：2020-07-02
Inventor： Xiaoshuang FENG , Naganatha PATIL , Senthil BOOPATHI , Yves GNANOU , Nikolaos HADJICHRISTIDIS
Abstract: Methods of recovering and/or reusing activators and/or initiators following polycarbonate synthesis may include: contacting an amine compound with a carboxylic acid compound to form a first ammonium salt including a first ammonium cation associated with a carboxylate group; mixing the first ammonium salt with a reaction solution to obtain a first solution comprising a protonated polycarbonate, an activator adduct, and a second ammonium salt in which the second ammonium cation is associated with the carboxylate group from the first ammonium salt; contacting the first solution to precipitate the polycarbonate out of solution; separating the activator adduct from the precipitated polycarbonate and the second ammonium salt to obtain a second solution; separating the precipitated polycarbonate from the second ammonium salt to recover the second ammonium salt; and separating the activator adduct from the second solution to recover an activator capable of being reused for synthesizing additional polycarbonates.
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