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 solvent s. Investigations were made in cyclohexanone and N,N-dimethylformamide , where only the radiation force is responsible for formation of the m icrometer-sized particle. The following conditions of the formation pr ocess 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 th e influences of the temperature and the solvent properties upon the fo rmation process.