Yasukazu Ohkatsu

Kinetic Evaluation of Reactivity of Phenolic Derivatives as Antioxidants for Polypropylene

Abstract Reactivity of commercial phenols as antioxidants for plastics, especially polypropylene, was examined under kinetic considerations. Inhibitive rate constants, kinh, were found to decrease in the order: SWP ≳ Topanol CA ≫ BMP > Ionox 330 > Irganox 1076 > Irganox 1010, while numbers n′ of free radicals trapped by the phenolic moiety decreased in the order: Irganox 1076 > Irganox 1010 ≳ Ionox 330 > BMP ≫ Topanol CA > SWP (the structures of these antioxidants are given in the text). In practical use of phenols for polypropylene, it was found that effective phenols are not those having higher values of of kinh., but n′ values nearly two. The effect of substituents, especially para substituents, of phenols on their activities was elucidated.

Synthesis and Polymerization of an Aminolysolecithin-type Macromer

Biomembranes consist mainly of phospholipids and proteins. In this study, a new amino lysolecithin- type macromer was designed and synthesized, for the preparation of thin membranes that would be similar to biomembranes. This macromer is an artificial phospholipid having two functional groups, a vinyl group to reinforce the membrane and an amino group to introduce the polypeptide chain. It forms small liposomes of 100 nm in the diameter in water. The macromer was not vinyl-polymerized as a liposome in itself, but was copolymerized in the presence of N,N-dimethylacrylamide

ABSORPTION OF NITROGEN OXIDES WITH AMMONIUM SALTS

Absorptions of an equimolar mixture of NO and NO2 in an aqueous solution of ammonium salts and with a cation-exchange resin substituted by ammonium ion were investigated by a flow method. Ammonium salts such as phosphate, benzoate, and oxalate were found effective for the removal of nitrogen oxides. Effects of temperature and time of contact were examined.