中国塑料 ›› 2024, Vol. 38 ›› Issue (5): 66-72.DOI: 10.19491/j.issn.1001-9278.2024.05.012

• 材料与性能 • 上一篇    下一篇

基于ReaxFF反应力场的膨胀阻燃体系热解反应机制研究

张翼1,2,3,4, 黄雅婷1,2,3,4(), 魏永宝1,2,3,4, 汤维2,3,4,5, 钱立军2,3,4,5   

  1. 1.北京工商大学计算机与人工智能学院,北京 100048
    2.中国轻工业先进阻燃剂工程技术研究中心,北京 100048
    3.石油和化学工业聚合物无卤阻燃剂工程实验室,北京 100048
    4.塑料卫生与安全质量评价技术北京市重点实验室,北京 100048
    5.北京工商大学轻工科学与工程学院,北京 100048
  • 收稿日期:2023-10-12 出版日期:2024-05-26 发布日期:2024-05-20
  • 通讯作者: 黄雅婷(1982—),女,副教授,从事分子动力学模拟、阻燃材料研究,huangyating@th.btbu.edu.cn
    E-mail:huangyating@th.btbu.edu.cn
  • 基金资助:
    国家自然科学基金(52273048);北京市自然科学基金项目(2222052);北京市教委科技发展计划项目(KM202210011004)

Study on pyrolysis mechanism of intumescent flame⁃retardant system based on reaction force field

ZHANG Yi1,2,3,4, HUANG Yating1,2,3,4(), WEI Yongbao1,2,3,4, TANG Wei2,3,4,5, QIAN Lijun2,3,4,5   

  1. 1.School of Computing and Artificial Intelligence,Beijing Technology and Business University,Beijing 100048,China
    2.China Light Industry Engineering Technology Research Center of Advanced Flame Retardants,Beijing 100048,China
    3.Petroleum and Chemical Industry Engineering Laboratory of Non?halogen Flame Retardants for Polymers,Beijing 100048,China
    4.Beijing Key Laboratory of Quality Evaluation Technology for Hygiene and Safety of Plastics,Beijing 100048,China
    5.School of Light Industry Science and Engineering,Beijing Technology and Business University,Beijing 100048,China
  • Received:2023-10-12 Online:2024-05-26 Published:2024-05-20
  • Contact: HUANG Yating E-mail:huangyating@th.btbu.edu.cn

摘要:

采用ReaxFF反应分子动力学模拟添加不同膨胀阻燃体系的聚丙烯(PP)的热解过程,从分子水平探究嵌段共聚物(PAPO⁃MP)与共混(PAPP/MPP)2种状态下阻燃体系的热解反应机制。结果表明,模拟热重曲线与实验结果误差低于2.1 %;加入膨胀阻燃体系后,反应活化能从200.16 kJ/mol分别降至154.64 kJ/mol(PAPO⁃MP)和159.14 kJ/mol(PAPP/MPP),说明阻燃剂优先反应从而保护基材;气体小分子数量分别减少10 %(PAPO⁃MP)和17.5 %(PAPP/MPP),P—O—P结构可以促进大分子团聚物生成,从而降低有毒有害气体生成及提高残炭质量;添加PAPO⁃MP比添加PAPP/MPP的体系势能平均降低11.6×103 kcal/mol,因此添加嵌段共聚物材料稳定性更优。

关键词: ReaxFF反应分子动力学, 聚丙烯, 膨胀阻燃体系, 阻燃机理

Abstract:

The pyrolysis and combustion mechanisms of polypropylene (PP) containing different flame retardants were investigated by using a reactive force field method. The pyrolysis reactions and flame retardancy of block copolymers (PAPO⁃MP) and blends (PAPP/MPP) were compared through the simulations in a molecular level. The results indicated that the difference between the calculation and the experiment in the mass residual yield was less than 2.1 %. The activation energy of the reaction decreased from 200.16 (pure PP) to 154.64 (PAPO⁃MP) and 159.14 kJ/mol (PAPP/MPP). This indicated that there was a prior response in the thermal decomposition of flame retardants to protect the substrate. Furthermore, the gas molecules decreased by 10 % for PAPO⁃MP and 17.5 % for PAPP/MPP. The P—O—P structure facilitated the generation of macromolecular agglomeration, thus reducing the toxic gases and improving the char residue. Moreover, the potential energy of the system was reduced by 11.6×103 kcal/mol with the addition of PAPO⁃MP compared to PAPP/MPP. In this case, the block copolymers exhibited a better stability.

Key words: ReaxFF reaction molecular dynamics, polypropylene, intumescent flame?retardant system, flame?retardant mechanism

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