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
A novel exfoliated silicone rubber/clay nanocomposite has been synthesized by hydroxyl terminated polydimethylsiloxane and organoclay. HTAB and TPAC were used as swelling agents to treat Na montmorillonite for forming...A novel exfoliated silicone rubber/clay nanocomposite has been synthesized by hydroxyl terminated polydimethylsiloxane and organoclay. HTAB and TPAC were used as swelling agents to treat Na montmorillonite for forming organoclay. The organoclay and nanocomposite were confirmed by X ray diffraction (XRD ). The d spacing in TPAC mont is 4 96 nm ,being larger than that of the HTAB mont. The mechanical properties of the nanocomposites have been measured by tensile testing machine. The results proved that the nanometer scale silicate layers of TPAC mont were completely exfoliated in silicone rubber matrix in the cases of 1% to 10% TPAC\|mont content.The nanocomposites exhibit markedly improved mechanical properties and thermal stability when compared with the pure polymer or conventional aerosilica\|filled silicone rubber.A 200%~300% increase in the tensile strength and a 100% increase in the elongation at break were found for TPAC mont/silicone rubber as compared to that of pure silicone rubber.The reinforing and intercalating mechanism of silicate layers in silicone rubber matrix were discussed.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A novel exfoliated silicone rubber/clay nanocomposite has been synthesized by hydroxyl terminated polydimethylsiloxane and organoclay. HTAB and TPAC were used as swelling agents to treat Na montmorillonite for forming organoclay. The organoclay and nanocomposite were confirmed by X ray diffraction (XRD ). The d spacing in TPAC mont is 4 96 nm ,being larger than that of the HTAB mont. The mechanical properties of the nanocomposites have been measured by tensile testing machine. The results proved that the nanometer scale silicate layers of TPAC mont were completely exfoliated in silicone rubber matrix in the cases of 1% to 10% TPAC\|mont content.The nanocomposites exhibit markedly improved mechanical properties and thermal stability when compared with the pure polymer or conventional aerosilica\|filled silicone rubber.A 200%~300% increase in the tensile strength and a 100% increase in the elongation at break were found for TPAC mont/silicone rubber as compared to that of pure silicone rubber.The reinforing and intercalating mechanism of silicate layers in silicone rubber matrix were discussed.