高等学校化学学报 ›› 2021, Vol. 42 ›› Issue (8): 2617.doi: 10.7503/cjcu20210178

• 高分子化学 • 上一篇    下一篇

聚酰亚胺玻璃化转变温度预测: 基团贡献加和法与未知基团赋值

黄聪聪1,2, 张宝庆1,2, 刘琛阳1,2()   

  1. 1.中国科学院化学研究所北京分子科学国家研究中心, 中国科学院工程塑料院重点实验室, 北京 100190
    2.中国科学院大学, 北京 100049
  • 收稿日期:2021-03-16 出版日期:2021-08-10 发布日期:2021-08-05
  • 通讯作者: 刘琛阳 E-mail:liucy@iccas.ac.cn
  • 基金资助:
    国家自然科学基金(21973105);国家重点基础研究发展计划项目(2014CB643601)

Predicting the Glass Transition Temperature of Polyimides: Group Additive Property Method and Assigning the Group Contributions to Unknown Groups

HUANG Congcong1,2, ZHANG Baoqing1,2, LIU Chenyang1,2()   

  1. 1.CAS Key Laboratory of Engineering Plastics,Beijing National Laboratory for Molecular Sciences,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China
    2.University of Chinese Academy of Sciences,Beijing 100049,China
  • Received:2021-03-16 Online:2021-08-10 Published:2021-08-05
  • Contact: LIU Chenyang E-mail:liucy@iccas.ac.cn
  • Supported by:
    the National Natural Science Foundation of China(21973105);the Key Project of Chinese National Programs for Fundamental Research and Development(2014CB643601)

摘要:

基团贡献加和法(GAP)假设聚合物性质来自于重复单元中各次级基团的贡献, 因此可以通过计算基团贡献值的加和值预测聚合物性质. van Krevelen建立了基团贡献加和法, 计算了数十种聚合物的性质, 包括常用的溶解度参数、 熔点和玻璃化转变温度(Tg)等参数. 聚酰亚胺是由二酐和二胺缩合反应得到的一类高性能聚合物, 其中Tg是决定聚酰亚胺使用温度范围的关键性质. 因此准确预测聚酰亚胺的Tg有助于优化和筛选单体分子结构. 本文首先利用van Krevelen提供的普适性基团贡献值计算了74种聚酰亚胺的Tg, 发现计算值与实验值具有较好的相关性(R2=0.88, s=21 K), 但存在系统误差, 如二者线性拟合斜率为0.78, 远偏离1. 由于普适性贡献值来自于不同聚合物的数据迭代, 对聚酰亚胺体系适用性较差, 必须对基团贡献值进行校正. 本文系统性地提高了刚性基团的贡献值, 同时降低了柔性基团的贡献值. 利用校正后的基团贡献值重新计算了Tg, 其与实验值具有更好的相关性(R2=0.88, s=18 K)和一致性(线性拟合斜率为0.94). 进一步使用上述校正后的已知基团贡献值对未知的7种二酐基团和6种二酐或二胺中的子基团进行赋值. 训练组(82个聚酰亚胺)和测试组(35个聚酰亚胺)数据验证了这13个基团贡献值的可靠性. 本文建立的基团贡献值校正方法和对未知基团的赋值法也可以推广应用于其它芳杂环类聚合物.

关键词: 基团贡献加和法, 聚酰亚胺, 玻璃化转变温度, 基团贡献值

Abstract:

Group additive property(GAP) method considers that the property of polymer can be calculated from the contribution of the groups that make up the main and side chains of the repeating unit. The glass transition temperature(Tg) and melting point et al. for polymer can be calculated by GAP. Aromatic polyimides are high-performance polymers obtained by dehydration condensation between dianhydride and diamine. Quantitatively predicting the glass transition temperature of polyimide from the chemical structure is helpful to optimize and prescreen the monomer molecular structure, but it remains a challenge. The Tg values of 74 polyimides were calculated by known group contributions offered by van Krevelen, the predicted Tg values are in good agreement with the experimental ones, with the standard deviation(s) of 21 K and R2 of 0.88, but there is still a large systematic error due to the deviation of the fitted curve slope(0.78) from 1. Therefore, the Tg values of these 74 polyimides were recalculated after the contribution values of the groups contained in these polyimides were corrected. The results showed a good correlation(R2=0.88, s=18 K) with experimental values, and the slope of the fitted curve(0.94) was close to 1, which means the systematic error is effectively eliminated. The corrected group contribution values were used in following calculations. A method to assign the group contribution values to unknown groups was proposed. Then the Yg values of 7 unknown dianhydrides and 6 unknown groups contained in dianhydrides or diamines were calculated by using this assignment method. The reliability of the contribution values of the 13 groups was verified by using the data of a training set(82 polyimides) and a test set(35 polyimides). This correction method and the assignment method presented in this work can also be used to other heteroaromatic polymers.

Key words: Group additive property, Polyimide, Glass transition temperature, Group contribution

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