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<p>To further explore the influence of pyrolysis process on matrix interference to gasoline identification, two polystyrene-butadiene rubbers reported to cause the most remarkable interference to gasoline identification were selected. Based on analysis on thermal behavior, residues with different pyrolysis degrees were prepared using a cone calorimeter. Qualitative and quantitative analyses were conducted by gas chromatography–mass spectrometry and Pearson product–moment correlation coefficient, respectively. The results showed that the first pyrolysis stage occurred within the temperature range of 200–350&#xa0;°C for SBR 1505 and 300–400&#xa0;°C for SBR 1205, while the second pyrolysis stage ranged from 350–450&#xa0;°C and 400–500&#xa0;°C, respectively. CO₂, aliphatic hydrocarbons, and aromatic hydrocarbons were generated during pyrolysis with different amount with pyrolysis stages. With increasing pyrolysis degrees, SBR 1505 and SBR 1205 exhibited significant differences in residues morphology, primarily due to variations in styrene content in chemical structure. As pyrolysis time increased, the detected alkylbenzenes increased in all residues except for SBR 1505 residues formed at 430&#xa0;°C. The relative content of C3-alkylbenzenes compared to C2-alkylbenzenes increased in all residues except for SBR 1205 residues formed at 400&#xa0;°C, while the PPMCC values between the SBRs residues and gasoline combustion residue decreased. With rising pyrolysis temperature, the detected alkylbenzenes in SBR 1505 residues decreased, whereas it increased in SBR 1205 residues. Meanwhile, in SBR 1505 residues, the relative content of C3-alkylbenzenes increased compared to C2-alkylbenzenes, while in SBR 1205 residues, the relative content of C3-alkylbenzenes first increased and then decreased.</p> Graphical abstract <p></p>

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Influence of pyrolysis process coupled with chemical structure of SBRs on interference to gasoline identification for fire debris analysis

  • 期刊论文

  • 发表日期：

    2025年4月17日

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  • Zhengzhe Zang,
  • Jing Jin,
  • Lujia Liang,
  • Yingzhe Li,
  • Qianqian Zhang,
  • Xinyu Wang,
  • Shujun Liu,
  • Zhenwen Sun

摘要

To further explore the influence of pyrolysis process on matrix interference to gasoline identification, two polystyrene-butadiene rubbers reported to cause the most remarkable interference to gasoline identification were selected. Based on analysis on thermal behavior, residues with different pyrolysis degrees were prepared using a cone calorimeter. Qualitative and quantitative analyses were conducted by gas chromatography–mass spectrometry and Pearson product–moment correlation coefficient, respectively. The results showed that the first pyrolysis stage occurred within the temperature range of 200–350 °C for SBR 1505 and 300–400 °C for SBR 1205, while the second pyrolysis stage ranged from 350–450 °C and 400–500 °C, respectively. CO₂, aliphatic hydrocarbons, and aromatic hydrocarbons were generated during pyrolysis with different amount with pyrolysis stages. With increasing pyrolysis degrees, SBR 1505 and SBR 1205 exhibited significant differences in residues morphology, primarily due to variations in styrene content in chemical structure. As pyrolysis time increased, the detected alkylbenzenes increased in all residues except for SBR 1505 residues formed at 430 °C. The relative content of C3-alkylbenzenes compared to C2-alkylbenzenes increased in all residues except for SBR 1205 residues formed at 400 °C, while the PPMCC values between the SBRs residues and gasoline combustion residue decreased. With rising pyrolysis temperature, the detected alkylbenzenes in SBR 1505 residues decreased, whereas it increased in SBR 1205 residues. Meanwhile, in SBR 1505 residues, the relative content of C3-alkylbenzenes increased compared to C2-alkylbenzenes, while in SBR 1205 residues, the relative content of C3-alkylbenzenes first increased and then decreased.

Graphical abstract