Poly(styrene-acrylonitrile) emulsion particles with positive charges on the surface were synthesized by emulsion polymerization using cationic surfactant octotyltrimethyl ammonium chloride (OTAC) as emulsifier.The sus...Poly(styrene-acrylonitrile) emulsion particles with positive charges on the surface were synthesized by emulsion polymerization using cationic surfactant octotyltrimethyl ammonium chloride (OTAC) as emulsifier.The suspension of montmorillonite was slowly dropped into the emulsion.Through the interaction between the negative charges on the montmorillonite layers and the cations on the surface of poly(styrene-acrylonitrile) particles, the montmorillonite layers and emulsion particles could assemble and absorb on each other by themselves.The change of δ voltage and particle size of the emulsion during the process of dropping was characterized, which demonstrated that the emulsion particles and montmorillonite layers absorbed on each other by the electrovalent bond and an intersectional structure was formed in the complex emulsion.Poly(styrene-acrylonitrile)/ montmorillonite nanocomposite was obtained after coagulation.The structure of nanocomposite was characterized with XRD and TEM.The results indicated that montmorillonite was exfoliated into layers with a thickness of several nanometers and uniformly dispersed in the polymer matrix.展开更多
选用了4种阻燃材料,对猪皮蓝湿革进行处理,考察阻燃剂种类、用量对皮革燃烧性能、厚度、收缩温度、物理机械性能以及感官性能的影响。革样燃烧性能用氧指数测定试验(ASTM D 2863-77)和垂直燃烧试验(ALCA Method E 50)结果进行表征。结...选用了4种阻燃材料,对猪皮蓝湿革进行处理,考察阻燃剂种类、用量对皮革燃烧性能、厚度、收缩温度、物理机械性能以及感官性能的影响。革样燃烧性能用氧指数测定试验(ASTM D 2863-77)和垂直燃烧试验(ALCA Method E 50)结果进行表征。结果表明:这4类阻燃剂均能提高革样阻燃性能,并且使革样无焰燃烧时间降低至0s;阻燃剂中引入具有片层结构的蒙脱土,其阻燃性能增加;这4种阻燃材料对革样物理机械性能(收缩温度、抗张强度、撕裂强度以及断裂伸长率)的影响不明显,但革样粒面更平细、紧实,丰满度和柔软感加强。展开更多
文摘Poly(styrene-acrylonitrile) emulsion particles with positive charges on the surface were synthesized by emulsion polymerization using cationic surfactant octotyltrimethyl ammonium chloride (OTAC) as emulsifier.The suspension of montmorillonite was slowly dropped into the emulsion.Through the interaction between the negative charges on the montmorillonite layers and the cations on the surface of poly(styrene-acrylonitrile) particles, the montmorillonite layers and emulsion particles could assemble and absorb on each other by themselves.The change of δ voltage and particle size of the emulsion during the process of dropping was characterized, which demonstrated that the emulsion particles and montmorillonite layers absorbed on each other by the electrovalent bond and an intersectional structure was formed in the complex emulsion.Poly(styrene-acrylonitrile)/ montmorillonite nanocomposite was obtained after coagulation.The structure of nanocomposite was characterized with XRD and TEM.The results indicated that montmorillonite was exfoliated into layers with a thickness of several nanometers and uniformly dispersed in the polymer matrix.
文摘选用了4种阻燃材料,对猪皮蓝湿革进行处理,考察阻燃剂种类、用量对皮革燃烧性能、厚度、收缩温度、物理机械性能以及感官性能的影响。革样燃烧性能用氧指数测定试验(ASTM D 2863-77)和垂直燃烧试验(ALCA Method E 50)结果进行表征。结果表明:这4类阻燃剂均能提高革样阻燃性能,并且使革样无焰燃烧时间降低至0s;阻燃剂中引入具有片层结构的蒙脱土,其阻燃性能增加;这4种阻燃材料对革样物理机械性能(收缩温度、抗张强度、撕裂强度以及断裂伸长率)的影响不明显,但革样粒面更平细、紧实,丰满度和柔软感加强。