Methyl methacrylate（MMA）—butyl acrylate（BA）—acrylic acid（AA） copolymer emulsion was prepared by emulsion polymerization using a redox initiation system of（NH4）2SO8-NaSO3.Factor of affecting copolymerization ...Methyl methacrylate（MMA）—butyl acrylate（BA）—acrylic acid（AA） copolymer emulsion was prepared by emulsion polymerization using a redox initiation system of（NH4）2SO8-NaSO3.Factor of affecting copolymerization and emulsion performance were studied.The experimental results show that the reaction rate,latex′s particle diameter and emulsion performance are affected by AA content.It is not important that the influence of composition of MMA-BA on the film forming.By seeding emulsion polymerization,copolymer emulsion stability is very well.Feeding ammonia water,the copolymer emulsion dissolved.Copolymer film is very good.展开更多
以Span-60为乳化剂,通过乳液聚合法制备了粉状、特性黏数为3.29 mPa.s的速溶淀粉接枝聚丙烯酰胺,采用傅立叶变换红外光谱仪、扫描电子显微镜、差热分析仪及X-射线衍射仪研究了接枝聚合物、可溶性淀粉及聚丙烯酰胺(PAM)的结构。结果表明...以Span-60为乳化剂,通过乳液聚合法制备了粉状、特性黏数为3.29 mPa.s的速溶淀粉接枝聚丙烯酰胺,采用傅立叶变换红外光谱仪、扫描电子显微镜、差热分析仪及X-射线衍射仪研究了接枝聚合物、可溶性淀粉及聚丙烯酰胺(PAM)的结构。结果表明,淀粉接枝聚合物具有网状多孔及部分线型结构,可溶性淀粉具有椭球形结构,PAM具有线型结构;接枝聚合物的结晶度提高,高于PAM的结晶度,且其热稳定性也高于PAM,这种结构是接枝聚合物良好絮凝性能的重要原因。接枝聚合物的溶解时间6.0 m in,与线型PAM的溶解时间5.5 m in接近。展开更多
文摘Methyl methacrylate（MMA）—butyl acrylate（BA）—acrylic acid（AA） copolymer emulsion was prepared by emulsion polymerization using a redox initiation system of（NH4）2SO8-NaSO3.Factor of affecting copolymerization and emulsion performance were studied.The experimental results show that the reaction rate,latex′s particle diameter and emulsion performance are affected by AA content.It is not important that the influence of composition of MMA-BA on the film forming.By seeding emulsion polymerization,copolymer emulsion stability is very well.Feeding ammonia water,the copolymer emulsion dissolved.Copolymer film is very good.
文摘以Span-60为乳化剂,通过乳液聚合法制备了粉状、特性黏数为3.29 mPa.s的速溶淀粉接枝聚丙烯酰胺,采用傅立叶变换红外光谱仪、扫描电子显微镜、差热分析仪及X-射线衍射仪研究了接枝聚合物、可溶性淀粉及聚丙烯酰胺(PAM)的结构。结果表明,淀粉接枝聚合物具有网状多孔及部分线型结构,可溶性淀粉具有椭球形结构,PAM具有线型结构;接枝聚合物的结晶度提高,高于PAM的结晶度,且其热稳定性也高于PAM,这种结构是接枝聚合物良好絮凝性能的重要原因。接枝聚合物的溶解时间6.0 m in,与线型PAM的溶解时间5.5 m in接近。
