Abstract
Radiation polymerization of acrolein in the bulk state was studied, and it was found that the microspheres of polyacrolein particles were formed in the absence of an emulsifing agent. The polymerization yield curve as a function of irradiation temperature had a break point at an irradiation temperature range of −20 to 0°C, in which an increase in particle size was observed. The size of the particles varied with irradiation temperature. Particles formed at low and high temperatures were relatively small. The size of particles formed in O 2 or under air bubbling conditions increased markedly with increasing irradiation dose, and that formed in an air atmosphere without air bubbling increased slightly with increasing irradiation dose. The particles formed under O 2 bubbling conditions had a narrow size distribution. The polymer structure was elucidated by IR spectrophotometry by which the aldehyde group concentration was monitored. The aldehyde content of the particles decreased with increasing irradiation dose. It was confirmed that polyacrolein particles having aldehyde groups can be bound easily to antibodies such as goat anti-rabbit IgG labeled with peroxidase. It was shown that polyacrolein particles can yield important immunoreagents for biological research.
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