Nitroxyl free radicals formed from hindered amine light stabilizersunder <sup>60</sup>Co γ-ray irradiation

WANG Huiliang; CHEN Wenxiu

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Nitroxyl free radicals formed from hindered amine light stabilizersunder ⁶⁰Co γ-ray irradiation

更新时间：2023-03-30

- Nitroxyl free radicals formed from hindered amine light stabilizersunder ⁶⁰Co γ-ray irradiation
- Journal of Radiation Research and Radiation Processing Vol. 24, Issue 3, Pages: 145-150(2006)
- 作者机构：
  
  1.北京师范大学化学学院　北京　100875
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WANG Huiliang, CHEN Wenxiu. Nitroxyl free radicals formed from hindered amine light stabilizersunder ⁶⁰Co γ-ray irradiation. [J]. Journal of Radiation Research and Radiation Processing 24(3):145-150(2006)
DOI：

WANG Huiliang, CHEN Wenxiu. Nitroxyl free radicals formed from hindered amine light stabilizersunder ⁶⁰Co γ-ray irradiation. [J]. Journal of Radiation Research and Radiation Processing 24(3):145-150(2006) DOI：

摘要

利用电子自旋共振分析（Electron spin resonance，ESR）研究了几种小分子型和高分子型受阻胺光稳定剂（Hindered amine light stabilizer，HALS）在,60,Co γ 射线辐照下生成氮氧自由基的规律。在空气中辐照时，几种受阻胺光稳定剂均能产生氮氧自由基。对大多数HALS，在0—10kGy的剂量范围内，氮氧自由基浓度随剂量几乎呈线性快速增加，在剂量大于10kGy以后，氮氧自由基浓度基本保持不变或随剂量呈缓慢增加的趋势。小分子型受阻胺产生的氮氧自由基浓度一般比高分子型受阻胺产生的氮氧自由基浓度高。四甲基受阻胺比五甲基光稳定剂更容易生成氮氧自由基。在氧气中产生的氮氧自由基的浓度为在空气中产生的氮氧自由基的浓度的2倍左右。还讨论了HALS在γ射线辐照下生成氮氧自由基的机理。

Abstract

Nitroxyl free radicals formed from several low molecular weight (LMW) hindered amine light stabilizers (HALS) under ,60,Co γ-ray irradiation was studied with electron spin resonance (ESR) spectroscopy. All the HALSs irradiated in air formed nitroxyl free radicals under irradiation in air. For most of the HALSs, concentration of the nitroxyl free radicals increased linearly and quickly with absorbed dose in 0-10kGy range, but increased slowly, or even kept constant, with doses of greater than 10kGy. Concentration of nitroxyl free radicals formed from LMW HALS was usually higher than high molecular weight HALS. Tetramethyl HALS was easier to form nitroxyl free radicals than pentamethyl HLAS. Concentration of nitroxyl free radicals formed from the samples irradiated in oxygen was about two times higher than that the samples irradiated in air. Mechanisms of the nitroxyl free radical formation from the γ-ray irradiated HALSs were was discussed.

关键词

受阻胺光稳定剂γ 射线辐照氮氧自由基

Keywords

Hindered amine light stabilizer (HALS)γ-ray irradiationNitroxyl free radical

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Nitroxyl free radicals formed from hindered amine light stabilizersunder 60Co γ-ray irradiation

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Nitroxyl free radicals formed from hindered amine light stabilizersunder ⁶⁰Co γ-ray irradiation