Scholarlink

<p>Using Fourier transforms infrared (FTIR), UV-visible spectroscopy, and X-ray diffraction, researchers examined how gamma radiation affected the chemistry involved in the product creation of polyethylene terephthalate (PET). A <sup>60</sup>Co gamma source running at a dosage rate of 1.707&#xa0;kGy/hr was utilized to provide doses up to 570&#xa0;kGy. The crystalline area is greatly impacted by gamma radiation, which results in a reduction in crystallinity. As the dosage of gamma radiation increases, the optical band gap energy drops. The establishment of extended conjugation results in a shift in absorption maxima from lower to higher wavelengths in UV-visible absorption spectra. After gamma irradiations up to dosage 570&#xa0;kGy, the absorption intensity of FTIR bands rises, suggesting changes in the chemical bond environment. The chemical pathways leading to products such as unsaturation, chain scission, decrease in ester group and release of free CO<sub>2</sub>, aromatic carboxylic acid, and types of molecular chain cross-linking are clarified.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Reaction Mechanism Chemistry of Chain Scission, Crosslinking, and Other Product Formation in γ-Ray Irradiated PET Polymer Using Molecular Spectroscopy

  • 期刊论文

  • 发表日期：

    2025年3月26日

查看全文
  • Shiv Govind Prasad,
  • Chhagan Lal,
  • Krishn Chandra Verma,
  • Devendra Pratap Rao

摘要

Using Fourier transforms infrared (FTIR), UV-visible spectroscopy, and X-ray diffraction, researchers examined how gamma radiation affected the chemistry involved in the product creation of polyethylene terephthalate (PET). A 60Co gamma source running at a dosage rate of 1.707 kGy/hr was utilized to provide doses up to 570 kGy. The crystalline area is greatly impacted by gamma radiation, which results in a reduction in crystallinity. As the dosage of gamma radiation increases, the optical band gap energy drops. The establishment of extended conjugation results in a shift in absorption maxima from lower to higher wavelengths in UV-visible absorption spectra. After gamma irradiations up to dosage 570 kGy, the absorption intensity of FTIR bands rises, suggesting changes in the chemical bond environment. The chemical pathways leading to products such as unsaturation, chain scission, decrease in ester group and release of free CO2, aromatic carboxylic acid, and types of molecular chain cross-linking are clarified.