CATIONIC CONDUCTIVITY FOR THE CROSSLINKED P [OLIGO (OXYETHYLENE) METHACRYLATE-COoMETHACRYLOYL ALKYLSULFONIC ACID LITHIUM]

Crosslinked copolymers with single Li~+-ionic conductivity were prepared from oligo (oxyethylene) methacrylate (MEO_n), methacryloyl alkylsulfonic acid lithium (SAMLi), and oligo (oxyethylene) dimethacrylate (DMEO_n). Li~+-ionic conductivity of the copolymer is improved by crosslinking and presented as a function of polymerization degree (n) in MEO_n, comonomeric salt concentration (O/Li), and crosslinking degree. The crosslinked copolymer P (0.7 MEO_(14)-0.3DMEO_(14)-SHMLi) without other small molecular additives exhibits an optimum Li~+-ionic conductivity of 1.2×10~(-6) S/cm at 25℃. Dc polarization test in the cell composed of Li/copolymer/Li shows a constant dc ionic conductivity which closes gradually to the ac one with decreasing dc polarization potential.     

甲基膦酸二甲庚脂-HBr体系萃取色层法分离微量镉及其应用

本文提出了以 P350为固定相,硅胶为载体,1.0mol/L HBr 为流动相,采用水作洗脱液的萃取柱色层分离微量镉的新方法。研究了分离条件,萃取保留机理和干扰等。用制定的方法对铅锌矿和冶炼电转尘中微量镉进行了分离测定,均获得良好结果。回收率在95～102％之间。     

自制电动磁力搅拌器磁棒

市售电动磁力搅拌器所带磁搅棒附件数量有限。由于其体积小,使用时极易丢失。人们通常用两种方法制作磁搅棒代用品。一种是将一段粗铁丝装在塑料软管内,然后用火烧封住塑料管两端。这样制做的磁棒代用品不能用于与塑料起反应的溶液中,具有一定局限性。第二种方法是将一段粗铁丝装在玻璃管内,然后用酒精喷灯烧封玻璃管两端。     

脉冲极谱法研究 II. 吸附可逆波的理论和验证

本文推导了同时受反应物和产物影响的脉冲极谱电流方程式, 并对电流-电位曲线的性质进行了讨论, 用三种体系进行验证, 实验结果与理论相符合。     

微量元素La对Al—Si合金凝固过程的影响

本文用差热分析法系统地研究了La掺杂对Al-Si共晶合金、亚共晶、超共晶的动态凝固过程的影响。结果表明,La促使α(Al)成核,使体系中初晶α(Al)的析出温度比AJ-Si二元合金中Al初晶的实际析出温度明显提高;La对初晶Si的成核和长大起抑制作用,使超共晶中初晶Si相析出温度较二元合金中的Si初晶的实际析出温度明显降低。