Inverse suspension polymerization of acrylamide was carried out in benzene continuous phase using cellulose acetate as suspension stabilizer and ammonium persulfate as initiator.An ideal recipe was recommended for the...Inverse suspension polymerization of acrylamide was carried out in benzene continuous phase using cellulose acetate as suspension stabilizer and ammonium persulfate as initiator.An ideal recipe was recommended for the preparation of monodispersed polyacrylamide particles of 150—297μm in diameter and 1.5—4.0 nm in polymer network pore size through experiments.The effects of initial monomer concentration,stabilizer concentration,initiator concentration and agitation rate on the diameter and diameter distribution of polymer particles were systematically studied.展开更多
选择甲酰胺作磁性Fe3O4微晶的分散剂,通过设计反相悬浮聚合体系,合成了粒径分布窄、球状亲水性含环氧基磁性聚合物(MGM).利用扫描电子显微镜(SEM)、红外光谱(FT-IR)、X射线粉末衍射仪(XRD)、振动样品磁强计(VSM)和低温N2...选择甲酰胺作磁性Fe3O4微晶的分散剂,通过设计反相悬浮聚合体系,合成了粒径分布窄、球状亲水性含环氧基磁性聚合物(MGM).利用扫描电子显微镜(SEM)、红外光谱(FT-IR)、X射线粉末衍射仪(XRD)、振动样品磁强计(VSM)和低温N2吸附以及化学分析方法对聚合物进行了性能表征.结果表明,合成的MGM呈球形,且粒度分布较窄,粒径为0.13,0.28mm的粒子占91%;甲酰胺分散Fe3O4,微晶表面的亲水性进一步增强,单体甲基丙烯酸缩水甘油酯和N,N'-亚甲基双丙烯酰胺交联共聚生成的胶粒能够包埋Fe3O4微晶形成胶核,胶核聚集形成均匀、稳定的MGM微球.MGM中Fe3O4含量为6.17%时,比饱和磁化强度σ.达6.5emu/g;其比表面积、平均孔径和孔容分别为117.6m^2/g,15.6nm和0.46cm^3/g,表面环氧基团含量为0.53mmol/g.MGM借助自身的活性环氧基团在十分温和的条件下共价偶联青霉素酰化酶(penicillin G acylase EC 3.5.1.11,简称PGA),制备的固定化酶在37℃下催化水解青霉素G钾生成6-氨基青霉烷酸(6-APA)的表观活性达502IU/g,并且在使用过程中投有出现磁聚集现象.展开更多
环己烷为连续相 ,水为分散相 ,采用反相悬浮聚合法合成了聚丙烯酸高吸水性树脂 .研究了碱用量、引发剂用量、交联剂用量及温度等反应条件对树脂物理状态和吸水性能的影响 .制得吸水树脂最高可吸水 850 m L / g,吸 0 .9% Na Cl溶液 12 0 ...环己烷为连续相 ,水为分散相 ,采用反相悬浮聚合法合成了聚丙烯酸高吸水性树脂 .研究了碱用量、引发剂用量、交联剂用量及温度等反应条件对树脂物理状态和吸水性能的影响 .制得吸水树脂最高可吸水 850 m L / g,吸 0 .9% Na Cl溶液 12 0 m L / g.展开更多
环己烷为连续相 ,水为分散相 ,采用反相悬浮聚合法合成了聚丙烯酸高吸水性树脂。研究了碱用量、引发剂用量、交联剂用量及温度等反应条件对树脂物理状态和吸水性能的影响。制得吸水树脂最高可吸水 85 0 m L g,吸 0 .9% Na Cl溶液 12 0m ...环己烷为连续相 ,水为分散相 ,采用反相悬浮聚合法合成了聚丙烯酸高吸水性树脂。研究了碱用量、引发剂用量、交联剂用量及温度等反应条件对树脂物理状态和吸水性能的影响。制得吸水树脂最高可吸水 85 0 m L g,吸 0 .9% Na Cl溶液 12 0m L g。展开更多
文摘Inverse suspension polymerization of acrylamide was carried out in benzene continuous phase using cellulose acetate as suspension stabilizer and ammonium persulfate as initiator.An ideal recipe was recommended for the preparation of monodispersed polyacrylamide particles of 150—297μm in diameter and 1.5—4.0 nm in polymer network pore size through experiments.The effects of initial monomer concentration,stabilizer concentration,initiator concentration and agitation rate on the diameter and diameter distribution of polymer particles were systematically studied.
文摘选择甲酰胺作磁性Fe3O4微晶的分散剂,通过设计反相悬浮聚合体系,合成了粒径分布窄、球状亲水性含环氧基磁性聚合物(MGM).利用扫描电子显微镜(SEM)、红外光谱(FT-IR)、X射线粉末衍射仪(XRD)、振动样品磁强计(VSM)和低温N2吸附以及化学分析方法对聚合物进行了性能表征.结果表明,合成的MGM呈球形,且粒度分布较窄,粒径为0.13,0.28mm的粒子占91%;甲酰胺分散Fe3O4,微晶表面的亲水性进一步增强,单体甲基丙烯酸缩水甘油酯和N,N'-亚甲基双丙烯酰胺交联共聚生成的胶粒能够包埋Fe3O4微晶形成胶核,胶核聚集形成均匀、稳定的MGM微球.MGM中Fe3O4含量为6.17%时,比饱和磁化强度σ.达6.5emu/g;其比表面积、平均孔径和孔容分别为117.6m^2/g,15.6nm和0.46cm^3/g,表面环氧基团含量为0.53mmol/g.MGM借助自身的活性环氧基团在十分温和的条件下共价偶联青霉素酰化酶(penicillin G acylase EC 3.5.1.11,简称PGA),制备的固定化酶在37℃下催化水解青霉素G钾生成6-氨基青霉烷酸(6-APA)的表观活性达502IU/g,并且在使用过程中投有出现磁聚集现象.