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We have studied the effects of ultraviolet (UV) photon irradiation on several biodegradable polymers. Three kinds of biodegradable polymers, poly-L-lactic acid (PLLA), polybutylene succinate (PBS), and polybutylene succinate adipate (PBSA), and low-density polyethylene (LDPE) as a reference were irradiated for 30 minutes by UV photons from a KrCl excimer lamp. It has become clear that the three biodegradable polymers are far more susceptible to UV photons than LDPE since they absorb UV photons very intensely in the vicinity of the irradiated surface. Figure 1 shows the effect of UV irradiation on the space charge distribution in PLLA. A dc electric field of 25 kV/mm was applied for 10 minutes to the sample, and the charge distribution was measured during the following 10 minutes under short-circuited condition. The space charge distribution profiles show that the quantity of charge carriers trapped near the irradiated surface is much larger in the irradiated PLLA than in the

Effects of Ultraviolet Photon Irradiation on the Dielectric Properties of Biodegradable Polymers