On the synthesis of acrylamide oligomers

Abstract

The synthesis of low-molecular-weight poly(acry1amide)s (M, = 500 -1000) is described. Metal-activated and non-activated polymerization in aqueous solution was investigated employing hydrogen peroxide as initiator. Among four transition metal salts considered, Cu2+ cations proved to be the most efficient in decomposing H202 molecules and were used as activator. The experiments were run at three reaction temperatures (60, 80 and 95 "C), at three H,O, levels (4, 5 and 6 wt.-Vo on monomer), and at four Cu2+ levels (900, 600, 300 and 0 ppm by weight of metal on monomer). Thus, ist was possible to prepare acrylamide oligomers with monomer conversions exceeding 95%, and with M, values covering the narrow range indicated above. Within these low limits a molecular weight control is impossible, even with inclusion of the differentiated

Synthesis and Properties of Novel Fluorotelechelic Macrodiols Containing Vinylidene Fluoride, Hexafluoropropene and Chlorotrifluoroethylene

“…Surprisingly, hydrogen peroxide which is cheap, reactive, and able to generate hydroxyl radicals, has scarcely been used as a potential initiator in radical polymerization of fluoroalkenes (tetrafluoroethylene , mainly), while synthesized α,ω-poly(acrylamide) diols or commercially available hydroxytelechelic polybutadienes − are easily achieved.…”