The effect of γ-rays irradiation on poly (L-lactic acid)

PENG Chaorong; CHEN Hao; WANG Jingxia; WU Ling; CHEN Zhuping; DENG Huachuan

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The effect of γ-rays irradiation on poly (L-lactic acid)

更新时间：2023-03-30

- The effect of γ-rays irradiation on poly (L-lactic acid)
- Journal of Radiation Research and Radiation Processing Vol. 26, Issue 6, Pages: 326-330(2008)
- 作者机构：
  
  1.四川省原子能研究院　成都610066
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PENG Chaorong, CHEN Hao, WANG Jingxia, et al. The effect of γ-rays irradiation on poly (L-lactic acid). [J]. Journal of Radiation Research and Radiation Processing 26(6):326-330(2008)
DOI：

PENG Chaorong, CHEN Hao, WANG Jingxia, et al. The effect of γ-rays irradiation on poly (L-lactic acid). [J]. Journal of Radiation Research and Radiation Processing 26(6):326-330(2008) DOI：

摘要

采用,60,Co γ射线对聚-L-乳酸（Poly(L-lactic acid)，PLLA）进行辐照。研究了在真空、氮气、空气和氧气气氛下吸收剂量对PLLA粘均分子量、结晶行为以及热失重的影响，并采用粘度法、差示扫描量热法（Differential scanning calorimeter，DSC）、偏光显微镜（Polarized microscope，POM）、热重分析法（Thermogravimetry analysis，TGA）对其进行了表征。结果表明，PLLA粘均分子量随吸收剂量的增加而下降，真空辐照的PLLA粘均分子量最高；在吸收剂量6～40kGy范围内，辐照提高PLLA的结晶度和结晶速率；在吸收剂量6～40kGy范围内，辐照后PLLA的TGA曲线移向高温。6kGy的吸收剂量，PLLA在氧气辐照气氛下热失重低于氮气辐照气氛。

Abstract

Poly (L-lactic acid) was irradiated by γ-rays. The effects of absorbed dose on viscosity average molecular weight, crystallization and thermal weight loss in irradiated condition under vacuum, nitrogen, air and oxygen were investigated, which were characterized by using ubbelohde viscometer, differential scamming calorimeter (DSC), polarized microscope and thermogravimetry analysis (TGA). Viscosity average molecular weight of PLLA decreases with increment of absorbed dose and viscosity average molecular weight of PLLA irradiated in vacuum is highest among the different irradiated condition at same absorbed dose. Both degree and rates of crystallization increase with increment of absorbed dose and TGA curves of PLLA irradiated under vacuum or nitrogen are shifted towards higher temperature compare with un-irradiated sample at the absorbed dose from 6~40kGy. The weight loss of PLLA irradiated under oxygen is lower than that under vacuum at absorbed dose of 6kGy.

关键词

聚-L-乳酸γ-辐照结晶热稳定性

Keywords

Poly (L-lactic acid)γ-rays irradiationCrystallizationThermal stability

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Key Laboratory of Textile Fiber and Products, Ministry of Education, Wuhan Textile University

Key Laboratory of Science & Technology of Eco-Textile, Ministry of Education, College of Textiles Science and Engineering, Jiangnan University

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Department of Engineering and Applied Physics, University of Science and Technology of China

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