Radiation Effects on PLA

As mentioned above, according to the development of PLA and related biocompatible copolymers, radiation effects on PLA materials due to sterilization have gained more attention since the 1970s. However, basic information about the radiation effects was rarely reported at that time. 

Birkinshaw et al. [23] examined y-irradiation effects on compression molded PLLA. Under 10.0 Mrad at a 

FIGURE 24.10 (a-d) Production of TMPD radical cations (a), main-chain scission radicals of 

PLLA (b), and main-chain tertiary radicals of PLLA (c) via photoionization of TMPD, according to Sakai et al. [17]. 

FIGURE 24.11 Production of (I) main chain radicals, (II) scission radicals, and (III) acyl radicals due to exposure to y-irradiated of PLLA and PDLLA below lOkGy, according to Babanalbandi et al. [24]. 

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