Well-defined nonionic hydrophilic ω-acryloyl poly(ethylene oxide) macro-monomer (PEO-A) has been prepared by living anionic polymerization of ethylene oxidewith diphenyl methyl potassium as the initiator and acryloyl...Well-defined nonionic hydrophilic ω-acryloyl poly(ethylene oxide) macro-monomer (PEO-A) has been prepared by living anionic polymerization of ethylene oxidewith diphenyl methyl potassium as the initiator and acryloyl chloride as the reaction termi-nating agent. The polymer was characterized by FTIR and SEC. The emulsifier-free emul-sion polymerization of methyl methacrylate (MMA) and n-butyl acrylate (BA) containingvarious concentrations of PEO-A was studied. In all cases stable emulsion coplymerizationsof MMA and BA were obtained. The stabilizing effect was found to be dependent on themolecular weight and the feed amount of the macromonomer.展开更多
A universally significant method,which combines the anionic polymerization with photoinduced charge transfer polymerization,for preparation of soluble star ABC triblock copolymer of ethylene oxide,styrene and methyl m...A universally significant method,which combines the anionic polymerization with photoinduced charge transfer polymerization,for preparation of soluble star ABC triblock copolymer of ethylene oxide,styrene and methyl methacrylate,was described.The poly(ethylene oxide) (PEO) block was formed by initiation of phenoxy an-ions using p-aminophenol protected by Schiff’s base as the parent compound Then the charge transfer system composed of PEO chains with deprotected-amino end groups and benzophenone initiated the polymerization of styrene and methyl metnacrylate sequentially under UV irradiation.The formed star triblock copolymer of styrene,ethylene oxide and methyl methacrylate could be purified by thin-layer chromatography (TLC) and characterized by IR,1H NMR,GPC (gel permeation chromatogrphy) and PGC (pyrolysis gas chromatography).展开更多
用溶液聚合法合成三元乙丙橡胶(EPDM)与甲基丙烯酸甲酯(MMA)及苯乙烯(St)接枝共聚物(EPDM-g-MS),用其与 MMA/St 共聚物(MS 树脂)共混制备高抗冲塑料(MES),研究了 EPDM-g-MS 对 MS 树脂的增韧作用,用扫描电子显微镜(SEM)和透射电子显微镜...用溶液聚合法合成三元乙丙橡胶(EPDM)与甲基丙烯酸甲酯(MMA)及苯乙烯(St)接枝共聚物(EPDM-g-MS),用其与 MMA/St 共聚物(MS 树脂)共混制备高抗冲塑料(MES),研究了 EPDM-g-MS 对 MS 树脂的增韧作用,用扫描电子显微镜(SEM)和透射电子显微镜(TEM)对 MES 的微观相结构进行了分析。结果表明:EPDM-g-MS 的接枝率、接枝链的极性及 EPDM 在 IVIES 中的含量是影响其对 MS 树脂增韧效果的主要因素。增加 EPDM-g-MS 的接枝率、增强其接枝链的极性及增加其用量均可提高 MES 的缺口冲击强度。MES 相结构的 TEM 分析和冲击断面形态的 SEM 分析表明,随着 EPDM 在 MES 中的含量的增加,EPDM-g-MS 分散相的粒径增大,粒面距离缩短,导致MES 的增韧机理由空穴化向轻度剪切屈服转变,MES 的缺口冲击强度随之而提高。展开更多
文摘Well-defined nonionic hydrophilic ω-acryloyl poly(ethylene oxide) macro-monomer (PEO-A) has been prepared by living anionic polymerization of ethylene oxidewith diphenyl methyl potassium as the initiator and acryloyl chloride as the reaction termi-nating agent. The polymer was characterized by FTIR and SEC. The emulsifier-free emul-sion polymerization of methyl methacrylate (MMA) and n-butyl acrylate (BA) containingvarious concentrations of PEO-A was studied. In all cases stable emulsion coplymerizationsof MMA and BA were obtained. The stabilizing effect was found to be dependent on themolecular weight and the feed amount of the macromonomer.
基金Project supported by the National Natural Science Foundation of Chinathe Doctoral Training Foundation of the State Education Commission of China
文摘A universally significant method,which combines the anionic polymerization with photoinduced charge transfer polymerization,for preparation of soluble star ABC triblock copolymer of ethylene oxide,styrene and methyl methacrylate,was described.The poly(ethylene oxide) (PEO) block was formed by initiation of phenoxy an-ions using p-aminophenol protected by Schiff’s base as the parent compound Then the charge transfer system composed of PEO chains with deprotected-amino end groups and benzophenone initiated the polymerization of styrene and methyl metnacrylate sequentially under UV irradiation.The formed star triblock copolymer of styrene,ethylene oxide and methyl methacrylate could be purified by thin-layer chromatography (TLC) and characterized by IR,1H NMR,GPC (gel permeation chromatogrphy) and PGC (pyrolysis gas chromatography).
文摘用溶液聚合法合成三元乙丙橡胶(EPDM)与甲基丙烯酸甲酯(MMA)及苯乙烯(St)接枝共聚物(EPDM-g-MS),用其与 MMA/St 共聚物(MS 树脂)共混制备高抗冲塑料(MES),研究了 EPDM-g-MS 对 MS 树脂的增韧作用,用扫描电子显微镜(SEM)和透射电子显微镜(TEM)对 MES 的微观相结构进行了分析。结果表明:EPDM-g-MS 的接枝率、接枝链的极性及 EPDM 在 IVIES 中的含量是影响其对 MS 树脂增韧效果的主要因素。增加 EPDM-g-MS 的接枝率、增强其接枝链的极性及增加其用量均可提高 MES 的缺口冲击强度。MES 相结构的 TEM 分析和冲击断面形态的 SEM 分析表明,随着 EPDM 在 MES 中的含量的增加,EPDM-g-MS 分散相的粒径增大,粒面距离缩短,导致MES 的增韧机理由空穴化向轻度剪切屈服转变,MES 的缺口冲击强度随之而提高。
