Journal of Radiation Research and Radiation Processing, Volume. 41, Issue 5, 050203(2023)

Synergistic effect of itaconic acid and irradiation modification on cyclization of polyacrylonitrile

Wanfeng HONG1, Fan ZHANG2, Wanning REN3, Zhi XIONG2, Yarui AN1, Wenli ZHANG2、*, and Guozhong WU2,3、**
Author Affiliations
  • 1University of Shanghai Science and Technology, Shanghai 200093, China
  • 2Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
  • 3ShanghaiTech University, Shanghai 200031, China
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    Polyacrylonitrile (PAN) powders with different itaconic acid (IA) contents were prepared using aqueous precipitation polymerization with IA as the second monomer. The powders of the copolymer P(AN-co-IA) were then subjected to electron beam (EB) irradiation treatment at room temperature and under an air atmosphere, with an absorbed dose ranging from 25 to 200 kGy. The chemical structure of P(AN-co-IA) was characterized using Fourier transform infrared spectroscopy. The effect of the IA content on PAN cyclization and the effect of EB irradiation on the thermal properties of the P(AN-co-IA) powders were investigated using differential scanning calorimetry and thermogravimetric analysis. The results showed that EB modification promoted the cyclization of PAN through a free radical mechanism, enabling cyclization at lower temperatures. In contrast, IA modification triggered cyclization through an ionic mechanism. Both modification methods synergistically promoted cyclization; however, their synergistic effect gradually decreased with increasing absorbed dose and IA content. The coefficient of influence was defined as the decrease in the exothermic enthalpy per 10 kGy increase in the absorbed dose. When the absorbed dose was less than 100 kGy, EB irradiation significantly affected the decrease in the exothermic enthalpy; however, the influence decreased rapidly with increasing absorbed dose. Moreover, when the absorbed dose exceeded 100 kGy, the rate of decrease of the coefficient of influence became reduced.


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    Wanfeng HONG, Fan ZHANG, Wanning REN, Zhi XIONG, Yarui AN, Wenli ZHANG, Guozhong WU. Synergistic effect of itaconic acid and irradiation modification on cyclization of polyacrylonitrile[J]. Journal of Radiation Research and Radiation Processing, 2023, 41(5): 050203

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    Paper Information

    Category: Research Articles

    Received: Nov. 9, 2022

    Accepted: Feb. 27, 2023

    Published Online: Dec. 27, 2023

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