高能辐射诱导聚乳酸（PLLA）膜降解：辐射化学产率、动力学、机理和辐射去离子化证据

IF 1.5 3区化学 Q3 CHEMISTRY, ANALYTICAL

Journal of Radioanalytical and Nuclear Chemistry Pub Date : 2025-01-28 DOI:10.1007/s10967-025-09979-z

Franco Cataldo, Ransel Barzaga, D. Aníbal García-Hernández, Arturo Manchado, Ilaria Di Sarcina, Alessia Cemmi

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引用次数: 0

摘要

根据不同吸收剂量下所记录的红外光谱中的酮吸收带，直接计算了辐照PLLA薄膜的链裂辐射化学产率G(S)。在100 kGy下测得最大值G(S) = 2.85±0.1劈裂/100 eV，与先前报道的G(S)非常吻合，但这是由CO2和CO气体分析得出的。在3 kGy/h的剂量率下，通过FT-IR光谱测定了PLLA的辐射降解速率常数在4.2 ~ 4.5 × 10-3 h−1范围内。经辐照后的PLLA薄膜的旋光色散分析表明，在100 kGy的辐照下，PLLA薄膜达到完全辐射消旋。用热分析（DSC和TGA）和分光光度法对辐照后的PLLA薄膜进行了分析。

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High energy radiation induced degradation of poly(lactic acid) (PLLA) film: radiation chemical yield, kinetics, mechanism and radioracemization evidences

The chain scission radiation chemical yield G(S) of irradiated PLLA films has been calculated directly from the ketone absorption band of its FT-IR spectra recorded at different absorbed dose. The maximum value G(S) = 2.85 ± 0.1 scission/100 eV was determined at 100 kGy, in excellent agreement with previously reported G(S) but determined from CO₂ and CO gas analysis. Furthermore, from the FT-IR spectra, the rate constant of PLLA radiolityc degradation was determined in the range of 4.2–4.5 × 10^–3 h⁻¹ at a dose rate of 3 kGy/h. The optical rotatory dispersion analysis of the irradiated PLLA films has shown that the complete radioracemization is reached at 100 kGy. The irradiated PLLA films were also analyzed by thermal analysis (both DSC and TGA) and spectrophotometrically.

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来源期刊

Journal of Radioanalytical and Nuclear Chemistry 化学-分析化学

CiteScore

2.80

自引率

18.80%

发文量

504

审稿时长

2.2 months

期刊介绍： An international periodical publishing original papers, letters, review papers and short communications on nuclear chemistry. The subjects covered include: Nuclear chemistry, Radiochemistry, Radiation chemistry, Radiobiological chemistry, Environmental radiochemistry, Production and control of radioisotopes and labelled compounds, Nuclear power plant chemistry, Nuclear fuel chemistry, Radioanalytical chemistry, Radiation detection and measurement, Nuclear instrumentation and automation, etc.