Effects of radiation on oxidation scission of polypropylene powder

Jixiang WANG; Fanghua XIE; Hongyan ZENG; Zhe XING; Hui LI; Hairong TAN; Guozhong WU

doi:10.11889/j.1000-3436.2018.rrj.36.050301

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Effects of radiation on oxidation scission of polypropylene powder

RADIATION CHEMISTRY | 更新时间：2021-12-10

- Effects of radiation on oxidation scission of polypropylene powder
- Journal of Radiation Research and Radiation Processing Vol. 36, Issue 5, (2018)
- 作者机构：
  
  1.湘潭大学化工学院湘潭 411105
  2.中国科学院上海应用物理研究所上海 201800
- 作者简介：
- 基金信息：
  
  the Science Challenge Project(TZ2018004)
- DOI：10.11889/j.1000-3436.2018.rrj.36.050301
  CLC：
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Jixiang WANG, Fanghua XIE, Hongyan ZENG, et al. Effects of radiation on oxidation scission of polypropylene powder. [J]. Journal of Radiation Research and Radiation Processing 36(5):050301-9(2018)
DOI：

Jixiang WANG, Fanghua XIE, Hongyan ZENG, et al. Effects of radiation on oxidation scission of polypropylene powder. [J]. Journal of Radiation Research and Radiation Processing 36(5):050301-9(2018) DOI： 10.11889/j.1000-3436.2018.rrj.36.050301.

摘要

研究了在室温25℃的空气条件下，纯聚丙烯（PP）粉末和添加交联剂（三烯丙基异氰脲酸酯质量分数2%）的聚丙烯（J-PP）粉末（粒径约48 μm）经γ射线或电子束辐照后的裂解效应。采用电子自旋共振（ESR）、傅里叶红外光谱（FTIR）、热重分析（TG）、凝胶渗透色谱（GPC）等方法对辐射引发的自由基浓度、化学结构、热稳定性以及氧化裂解程度进行了表征，探讨了吸收剂量及剂量率对裂解效应的影响。ESR结果显示：PP和J-PP粉末在辐照后均有过氧自由基的产生；红外光谱分析发现两者都有氧化产物的产生，交联剂的添加无法阻止聚丙烯的氧化裂解，归一化处理后发现羰基的吸收峰强度随着剂量的增加而增强；TG结果表明辐照后样品的起始分解温度均有所下降，但下降的幅度有所不同；熔融指数和GPC测试表明辐照后PP和J-PP的平均分子量随着吸收剂量的增加而减小。

Abstract

Radiation oxidation of polypropylene (PP) and PP with 2% crosslinking agent triallyl isocyanurate (TAIC) (J-PP) powders (the size of the powder particles was approximately 48 μm) were investigated under gamma-ray and electron beam irradiation in air at room temperature (25℃). Electron spin resonance (ESR), Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TG), and gel permeation chromatography (GPC) were used to characterize the free-radical concentration, chemical structure, thermal stability, and oxidation scission induced by gamma-ray or electron beam irradiation, and the effects of the absorbed dose and dose rate on the properties of PP were also studied. The results showed that peroxy radicals and oxidative products were formed upon irradiation for both PP and J-PP powders, and the addition of the crosslinking agent TAIC could not prevent the degradation of polypropylene. The melt flow index (MFI) and GPC results revealed that the average molecular weight of the irradiated PP and J-PP powders declined with the increasing absorbed doses.

关键词

γ射线电子束聚丙烯粉末氧化裂解

Keywords

Gamma-raysElectron beampolypropylene powderOxidation scission

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