Abstract
The bowl-shaped aggregates were prepared by using an azo polymer ( BP-AZ-2CA),and their photoinduced deformation behavior was studied. The bowl-shaped aggregates were prepared through gradual hydrophobic aggregation of the polymeric chains in DMF-H2O media and characterized by using TEM. critical water content (CWC) was obtained by the light scattering measurement. The results showed that two types of aggregates formed in the system,one was small colloidal spheres and the other was bowl-shaped aggregates. The aggregates with different average diameters were obtained by adjusting the initial polymer concentration and water-adding rate in the preparation processes. The photoinduced deformation behavior was studied by irradiating the bowl-shaped aggregates in solid state with a linearly polarized Ar + laser beam (488 nm,110 mW /cm2) for different time periods. Upon the light irradiation,the bowl-shaped aggregates were elongated along the polarization direction of the laser beam especially when the irradiation time was longer than 15 min. The hollow space in the aggregates almost remained unchanged after irradiation. The morphology of the bowl- shaped aggregates after irradiation changed with the angle between the bowl-shaped aggregates and the polarization direction of the light beam.
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