本文报道合成了八个有机硅化合物,均可用作甲基丙烯酸甲酯的基团转移聚合(Group Transfer Polymerization GTP)引发剂,在相同单体、催化剂、溶剂配比和聚合条件下,进行反应,所得产物用凝胶渗透色谱(GPC)作了分子量及分量分布的表征,引...本文报道合成了八个有机硅化合物,均可用作甲基丙烯酸甲酯的基团转移聚合(Group Transfer Polymerization GTP)引发剂,在相同单体、催化剂、溶剂配比和聚合条件下,进行反应,所得产物用凝胶渗透色谱(GPC)作了分子量及分量分布的表征,引发剂的结构和活性对产物的分子量和分布宽度均有显着影响。所用引发剂中以1-甲氧基-1-(三甲硅氧基)-2-甲基-1-丙烯和双(乙氧基)-3-甲氧基-3-(三甲硅氧基)-2-甲基-2-丙烯-1-磷酸酯引发剂,所得产物的分子量分布最窄,分子量的绝对值与理论值相近,分子量与理论值的偏离是随产物分子量分布宽度的增加而增大.展开更多
基团转移聚合(Group Transfer Polymerization, GTP)是1983年首先由Du Pont公司Webster等人报道的一种新的聚合方法。它是以活性硅烷基化合物为引发剂,在一定的催化剂存在下,使α,β-不饱和羰基化合物聚合成“活性聚合物”。由于它具有...基团转移聚合(Group Transfer Polymerization, GTP)是1983年首先由Du Pont公司Webster等人报道的一种新的聚合方法。它是以活性硅烷基化合物为引发剂,在一定的催化剂存在下,使α,β-不饱和羰基化合物聚合成“活性聚合物”。由于它具有所得聚合物分子量分布窄,结构易控制。展开更多
The optically active polymers of (-) menthyl methacrylate were obtained by anionic, group transfer polymerization(GTP) and radical polymerization methods. The influences of different polymerization methods on specific...The optically active polymers of (-) menthyl methacrylate were obtained by anionic, group transfer polymerization(GTP) and radical polymerization methods. The influences of different polymerization methods on specific rotation, yield and stereoregularity of polymers were studied. In the fluorene lithium and ( S,S ) (+) 2,3 dimethoxy 1,4 bis(dimethylamino)butane complex initiative system, the specific rotation values rise slightly with the increase of molecular weight. There is no obvious difference in the specific rotation values of PMnMAs obtained by different polymerization methods, but there is an obvious variation in stereoregularity of the polymers. And the change of the optical activity of PMnMA is slight as compared with the variation of the stereoregularity. The tacticity of polymers is mainly syndiotactic.展开更多
文摘本文报道合成了八个有机硅化合物,均可用作甲基丙烯酸甲酯的基团转移聚合(Group Transfer Polymerization GTP)引发剂,在相同单体、催化剂、溶剂配比和聚合条件下,进行反应,所得产物用凝胶渗透色谱(GPC)作了分子量及分量分布的表征,引发剂的结构和活性对产物的分子量和分布宽度均有显着影响。所用引发剂中以1-甲氧基-1-(三甲硅氧基)-2-甲基-1-丙烯和双(乙氧基)-3-甲氧基-3-(三甲硅氧基)-2-甲基-2-丙烯-1-磷酸酯引发剂,所得产物的分子量分布最窄,分子量的绝对值与理论值相近,分子量与理论值的偏离是随产物分子量分布宽度的增加而增大.
文摘基团转移聚合(Group Transfer Polymerization, GTP)是1983年首先由Du Pont公司Webster等人报道的一种新的聚合方法。它是以活性硅烷基化合物为引发剂,在一定的催化剂存在下,使α,β-不饱和羰基化合物聚合成“活性聚合物”。由于它具有所得聚合物分子量分布窄,结构易控制。
文摘The optically active polymers of (-) menthyl methacrylate were obtained by anionic, group transfer polymerization(GTP) and radical polymerization methods. The influences of different polymerization methods on specific rotation, yield and stereoregularity of polymers were studied. In the fluorene lithium and ( S,S ) (+) 2,3 dimethoxy 1,4 bis(dimethylamino)butane complex initiative system, the specific rotation values rise slightly with the increase of molecular weight. There is no obvious difference in the specific rotation values of PMnMAs obtained by different polymerization methods, but there is an obvious variation in stereoregularity of the polymers. And the change of the optical activity of PMnMA is slight as compared with the variation of the stereoregularity. The tacticity of polymers is mainly syndiotactic.
