A Aeries of hydroxylic hyperbranched polymers were derived from 2,2-bis(methylol) propionic acid and tris(methylol) propane reacted with acrylic acid to various extents. The obtained acrylated hyperbranched polymers a...A Aeries of hydroxylic hyperbranched polymers were derived from 2,2-bis(methylol) propionic acid and tris(methylol) propane reacted with acrylic acid to various extents. The obtained acrylated hyperbranched polymers alone or with a monofunctional diluent, isobornylene acrylate(IBOA) were further cured by UV radiation. The cured films based on the modified polymers alone all demonstrated poor mechanical properties due to their high network densities and low moving ability of polymer chains. For the composite systems, the cured films demonstrated improved mechanical properties due to the low network densities and high chain moving ability. With more IBOA included in the systems, acrylate groups can react to a higher extent during the curing process.展开更多
Two UV curable hyperbranchend polysiloxanes（Ⅰ and Ⅲ） containing vinyl and allyl end groups and an UV cationic curable hyperbranched polymer Ⅱ-Ep with epoxy end groups,were synthesized via the polyhydrosilylation ...Two UV curable hyperbranchend polysiloxanes（Ⅰ and Ⅲ） containing vinyl and allyl end groups and an UV cationic curable hyperbranched polymer Ⅱ-Ep with epoxy end groups,were synthesized via the polyhydrosilylation using AB2 type monomers.All hydrosilylation reactions were catalyzed by（Pt/C） or chloroplatinic acid.Three AB2 type monomers were synthesized via hydrolyzation of functional chlorosilane prepared by using Grignardeagents,and dichlorosilane.The molecular structures of the polymers were characterized by（）1H-,（）29Si-NMR,FTIR and GPC,and the UV-curing behaviors of polymers in different atmospheres and different photoaccelerators were also investigated.展开更多
基金Supported by the National Natural Science Foundation of China(No.2 0 2 0 4 0 0 5 ,5 0 2 330 30 ) and Basic Research Fund ofTsinghua University(No.JC2 0 0 2 0 30 )
文摘A Aeries of hydroxylic hyperbranched polymers were derived from 2,2-bis(methylol) propionic acid and tris(methylol) propane reacted with acrylic acid to various extents. The obtained acrylated hyperbranched polymers alone or with a monofunctional diluent, isobornylene acrylate(IBOA) were further cured by UV radiation. The cured films based on the modified polymers alone all demonstrated poor mechanical properties due to their high network densities and low moving ability of polymer chains. For the composite systems, the cured films demonstrated improved mechanical properties due to the low network densities and high chain moving ability. With more IBOA included in the systems, acrylate groups can react to a higher extent during the curing process.
文摘Two UV curable hyperbranchend polysiloxanes（Ⅰ and Ⅲ） containing vinyl and allyl end groups and an UV cationic curable hyperbranched polymer Ⅱ-Ep with epoxy end groups,were synthesized via the polyhydrosilylation using AB2 type monomers.All hydrosilylation reactions were catalyzed by（Pt/C） or chloroplatinic acid.Three AB2 type monomers were synthesized via hydrolyzation of functional chlorosilane prepared by using Grignardeagents,and dichlorosilane.The molecular structures of the polymers were characterized by（）1H-,（）29Si-NMR,FTIR and GPC,and the UV-curing behaviors of polymers in different atmospheres and different photoaccelerators were also investigated.
