H. Murata, F. Sanda, T. Endo
Aug 12, 1996
Citations
0
Influential Citations
26
Citations
Journal
Macromolecules
Abstract
Synthesis and radical polymerization of methacrylamide having an l-leucyl-l-alanine methyl ester structure, N-methacryloyl-l-leucyl-l-alanine methyl ester (MA-LA-M), were carried out. Radical polymerization of MA-LA-M in the presence of AIBN (1 mol %) in chlorobenzene (1.0 mol/L) afforded the corresponding polymer (poly(MA-LA-M)) with Mn 196 000. The 10% weight loss temperature of poly(MA-LA-M) under nitrogen was 300 °C. Increase of the absolute value of specific rotation in the transformation from MA-LA-M (−48.0°) to poly(MA-LA-M) (−76.5°) could be observed. The rate of radical polymerization of MA-LA-M was 4−6 times larger than that of N-methacryloyl-l-leucine methyl ester (MA-L-M) in benzene-d6 (1.0 mol/L), whereas the activation energy (Ea) of MA-LA-M (51.4 kJ/mol) was larger than that of MA-L-M (29.7 kJ/mol). The absolute value of the activation entropy (ΔS⧧) in the radical polymerization of MA-LA-M (−144 J/(K·mol)) was smaller than that of MA-L-M (−221 J/(K·mol)). These parameters for the both mono...