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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：US20210309801A1
公开(公告)日：2021-10-07
申请号：US17203931
申请日：2021-03-17
Inventor： Xiaoshuang FENG , Jobi VARGHESE , Yves GNANOU , Nikos HADJICHRISTIDIS , Mingchen JIA , Dhanya AUGUSTINE
IPC: C08G65/10 , C08F293/00
Abstract: Degradable ethylene oxide-based copolymers, including random, tapering, and block copolymers are described. For example, the present disclosure describes materials and methods for synthesizing degradable hydrophilic ethylene oxide-based copolymers, degradable amphiphilic ethylene oxide-based block copolymers, degradable hydrophobic polyethers and degradable functionalized polyethers via boron-activated copolymerization of ethylene oxide monomers with carbon dioxide.
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