Poly(methyl acrylate)-b-poly(5,6-benzo-2-methylene-1,3-dioxepane) (PMA-b-PBMDO) was synthesized by two-step atom transfer radical polymerization (ATRP). Firstly, ATRP of methyl acrylate (MA) was realized using ethyl a...Poly(methyl acrylate)-b-poly(5,6-benzo-2-methylene-1,3-dioxepane) (PMA-b-PBMDO) was synthesized by two-step atom transfer radical polymerization (ATRP). Firstly, ATRP of methyl acrylate (MA) was realized using ethyl alpha-bromobutyrate (EBrB) as initiator in the presence of CuBr/2,2'-bipyridine. After isolation, poly(methyl acrylate) with terminal bromine (PMA-Br) was synthesized. Secondly, the resulting PMA-Br was used as a macromolecular initiator in the ATRP of BMDO. The structure of block copolymer was characterized by H-1-NMR spectroscopy. Molecular weight and molecular weight distribution were determined on a gel permeation chromatograph (GPC).展开更多
The UP PER UP blocked copolymer was prepared by the reaction of unsaturated polyester(UP)and polyepoxy resin(PER)under suitable conditions. The modified photosensitive resin was formed after the addition of the active...The UP PER UP blocked copolymer was prepared by the reaction of unsaturated polyester(UP)and polyepoxy resin(PER)under suitable conditions. The modified photosensitive resin was formed after the addition of the active monomers into the copolymer. The UV cured process of the resin was investigated by means of FTIR spectrum and the properties of the UV cured coat were characterized in terms of TG/DTA and other analysis. The results indicated that the UV cured resin showed the advantages of both unsaturated polyester resin and polyepoxy resin. The base resistant ability, thermostability and surface hardness of the resin were greatly improved. The volume shrinkage of the sample was lowered from 7% to 0.8% and the adhesion power on substrate was increased. Thus the applications of unsaturated polyester resin were widely promoted.展开更多
An nanostructured thermoset blend of unsaturated polyester(UPR) and PEO-PPO-PEO triblock copolymer was prepared and characterized by solid-state NMR and other techniques.It is concluded that the blend is microphase se...An nanostructured thermoset blend of unsaturated polyester(UPR) and PEO-PPO-PEO triblock copolymer was prepared and characterized by solid-state NMR and other techniques.It is concluded that the blend is microphase separated and the determined long period is 20 nm.A distinct dynamic difference between the cured-UPR matrix and block copolymers was observed by 1D and 2D NMR experiments,the formation of PEO crystalline domains was inhibited in the blend.The PEO blocks are partially miscible with the cured-UPR matrix.Upon curing, part of the mobile PEO was locally expelled from the cured-UPR matrix and formed dispersed microphase together with the mobile PPO,the residual immobilized PEO blocks were intimately mixed with the partially cured-UPR, and they formed an interphase region.展开更多
基金This work was supported by the National Natural Science Foundation of China (No. 29774027).
文摘Poly(methyl acrylate)-b-poly(5,6-benzo-2-methylene-1,3-dioxepane) (PMA-b-PBMDO) was synthesized by two-step atom transfer radical polymerization (ATRP). Firstly, ATRP of methyl acrylate (MA) was realized using ethyl alpha-bromobutyrate (EBrB) as initiator in the presence of CuBr/2,2'-bipyridine. After isolation, poly(methyl acrylate) with terminal bromine (PMA-Br) was synthesized. Secondly, the resulting PMA-Br was used as a macromolecular initiator in the ATRP of BMDO. The structure of block copolymer was characterized by H-1-NMR spectroscopy. Molecular weight and molecular weight distribution were determined on a gel permeation chromatograph (GPC).
文摘The UP PER UP blocked copolymer was prepared by the reaction of unsaturated polyester(UP)and polyepoxy resin(PER)under suitable conditions. The modified photosensitive resin was formed after the addition of the active monomers into the copolymer. The UV cured process of the resin was investigated by means of FTIR spectrum and the properties of the UV cured coat were characterized in terms of TG/DTA and other analysis. The results indicated that the UV cured resin showed the advantages of both unsaturated polyester resin and polyepoxy resin. The base resistant ability, thermostability and surface hardness of the resin were greatly improved. The volume shrinkage of the sample was lowered from 7% to 0.8% and the adhesion power on substrate was increased. Thus the applications of unsaturated polyester resin were widely promoted.
文摘An nanostructured thermoset blend of unsaturated polyester(UPR) and PEO-PPO-PEO triblock copolymer was prepared and characterized by solid-state NMR and other techniques.It is concluded that the blend is microphase separated and the determined long period is 20 nm.A distinct dynamic difference between the cured-UPR matrix and block copolymers was observed by 1D and 2D NMR experiments,the formation of PEO crystalline domains was inhibited in the blend.The PEO blocks are partially miscible with the cured-UPR matrix.Upon curing, part of the mobile PEO was locally expelled from the cured-UPR matrix and formed dispersed microphase together with the mobile PPO,the residual immobilized PEO blocks were intimately mixed with the partially cured-UPR, and they formed an interphase region.
