In order to investigate the partition of initiators for quasi-static precipitation polymerization of acrylamide (AAm) and methacrylic acid (MAc) in ethanol

azo-initiators were employed with various functional groups such as —COOCH

3

(V-601

dimethyl 2

2′-azobis(isobutyrate))

— CN (V-65

2

2′-Azobis(2

4-diemthylvaleronitrile))

— COOH (V-501

4

4′-azobis(4-cyanovaleric acid)) and —NH-(VA-061

2

2′-azobis[2-(2-imidazolin-2-yl)propane])

respectively. Particle size

induction time and kinetics of polymerization were investigated by the scanning electron microscopy (SEM) and gravimetry. It was observed that the polymerization parameters

such as the particle size

induction time and polymerization rate

were considerably affected by the functional groups of initiators. Besides

the monomer concentration also played important roles in the particle formation. By using V-601

the polymerization rate was strongly correlated with the total surface area of particles and the concentration of initiators. However

by using V-501

the polymerization rate was strongly related to

W

0

C

i

0

where

W

0

is the initial concentration of monomers and

C

i

0

the initial concentration of initiators. The results indicated that the different functional groups determined the different partition types of initiators between the minimonomer droplets and the continuous phase due to the molecular interactions of initiator and monomers. V-601 was all partitioned in the continuous phase

but a part of V-65 was partitioned in the minimonomer droplets. Besides the V-501 dissolved in the continuous phase

a part of V-501 was adsorbed on the surface of minimonomer droplets. VA-061 destroyed the stability of minimonomer droplets by the formation of zwitterions with MAA.