The Polysuccinimide is Synthesized by means of pyrocondensation catalyze polymerization, using L-aspartic acid as a monomer. Poly-aspartic Acid is achieved by hydrolization of Polysuccinimide. The effect of temperatur...The Polysuccinimide is Synthesized by means of pyrocondensation catalyze polymerization, using L-aspartic acid as a monomer. Poly-aspartic Acid is achieved by hydrolization of Polysuccinimide. The effect of temperature, time, catalyzer and condition of hydrolization on yield and quality is studied. The research results show that the method has the advantages of simple equipment and high yield.展开更多
The catalytic activity of complex [(Bu t C 5H 4) 2NdMe] 2(1) for MMA polymerization has been investigated. It was found that (1) shows high catalytic activity at -78 ℃, however, the catalytic activity decreases with ...The catalytic activity of complex [(Bu t C 5H 4) 2NdMe] 2(1) for MMA polymerization has been investigated. It was found that (1) shows high catalytic activity at -78 ℃, however, the catalytic activity decreases with the increase of polymerization temperature dramatically. The conversion is as high as 100% at -40 ℃ in the case of n (catalyst)∶ n (monomer)=3∶1000, while the conversion is 0 at 40 ℃. The stoichiometric reaction between (1) and MMA in 1∶2 mole ratio at 40 ℃ gave complex [(Bu t C 5H 4) 2NdOMe] 2(2), which was formed by the nucleophilic substitution reaction of (1) to ester group of MMA. The result is explained in terms of deactivation of (1) for MMA polymerization above room temperature. The structure of (2) was confirmed by elemental analysis, IR, MS and X ray diffraction measurements.展开更多
文摘The Polysuccinimide is Synthesized by means of pyrocondensation catalyze polymerization, using L-aspartic acid as a monomer. Poly-aspartic Acid is achieved by hydrolization of Polysuccinimide. The effect of temperature, time, catalyzer and condition of hydrolization on yield and quality is studied. The research results show that the method has the advantages of simple equipment and high yield.
文摘The catalytic activity of complex [(Bu t C 5H 4) 2NdMe] 2(1) for MMA polymerization has been investigated. It was found that (1) shows high catalytic activity at -78 ℃, however, the catalytic activity decreases with the increase of polymerization temperature dramatically. The conversion is as high as 100% at -40 ℃ in the case of n (catalyst)∶ n (monomer)=3∶1000, while the conversion is 0 at 40 ℃. The stoichiometric reaction between (1) and MMA in 1∶2 mole ratio at 40 ℃ gave complex [(Bu t C 5H 4) 2NdOMe] 2(2), which was formed by the nucleophilic substitution reaction of (1) to ester group of MMA. The result is explained in terms of deactivation of (1) for MMA polymerization above room temperature. The structure of (2) was confirmed by elemental analysis, IR, MS and X ray diffraction measurements.
