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- W2025613213 abstract "Poly( l -lactic acid) (PLA), was irradiated with γ-rays in air and in vacuum at 25°C. Melting point T m , glass transition temperature T g and number-average molecular weight M n decreased with increasing irradiation dose. At low doses, T m , T g and M n decreased sharply and then the rate became slower. Up to 200 kGy, PLA was predominantly degraded by random chain-scission. Above 200 kGy, recombination reactions or partial crosslinking may occur in addition to chain-scission. The degree of chain-scission G s of irradiated PLA was calculated to be 1.97 in air and 0.83 in vacuum. The decrease in M n , T m and T g of the sample in air was faster than in vacuum because of oxidative chain-scission. Biodegradation of PLA was retarded with increasing dose due to the introduction of crosslinking during irradiation. ESR spectroscopy showed five kinds of radicals assigned to three kinds of ESR spectra." @default.
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- W2025613213 date "2001-05-01" @default.
- W2025613213 modified "2023-10-01" @default.
- W2025613213 title "Degradation of poly(l-lactic acid) by γ-irradiation" @default.
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- W2025613213 doi "https://doi.org/10.1016/s0141-3910(01)00030-1" @default.
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