Laser-controlled association of poly(N-vinylcarbazole) in organic solvents: Radiation pressure effect of a focused near-infrared laser beam

Microassociation of poly(N-vinylcarbazole) by a focused near-infrared laser beam (cw-YAG, 1064 nm) was first demonstrated in organic solvents. Investigations were made in cyclohexanone and N,N-dimethylformamide, where only the radiation force is responsible for formation of the micrometer-sized particle. The following conditions of the formation process were examined for elucidating the mechanism: polymer association as a function of the concentration (range 3.5-6.8 wt %), the relation between the trapping laser power and the time of condensation, and the influences of the temperature and the solvent properties upon the formation process.