Production of polydivinylbiphenyl particles by precipitation polymerization in supercritical carbon dioxide

Abstract.

Polydivinylbiphenyl particles were produced by precipitation polymerization of divinylbiphenyl without any stabilizer in supercritical carbon dioxide as polymerization medium at ca. 30 MPa for 24 h at 65 °C at different initiator concentrations (0.5–58.1 mmol l^–1). The conversions in all polymerization systems were relatively high. An increase in initiator concentration led to increases in the degree of coagulation and in the amount of low-molecular-weight byproducts and to a decrease in the amount of vinyl groups in the particle.