Chem. J. Chinese Universities ›› 2025, Vol. 46 ›› Issue (4): 20240556.doi: 10.7503/cjcu20240556

• Polymer Chemistry • Previous Articles    

Machine Learning Model for Predicting the Glass Transition Temperature of Polyimides Based on Molecular Fingerprints and Quantum Chemical Descriptors

ZHAN Senhua, SHI Tongfei()   

  1. School of Chemical Engineering and Light Industry,Guangdong University of Technology,Guangzhou 510006,China
  • Received:2024-12-23 Online:2025-04-10 Published:2025-01-15
  • Contact: SHI Tongfei E-mail:tfshi@gdut.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(2247030172)

Abstract:

Combining machine learning and quantum chemistry methods to construct predictive models can facilitate the design and screening of polyimide material structures. In this study, Molecular ACCess System(MACCS) fingerprints and nine density functional theory(DFT) quantum chemical descriptors were obtained from polyimide repeating units to construct three types of predictive models: MACCS, DFT and their integrated models. Twelve machine learning models were developed using four algorithms——random forest(RF), support vector regression (SVR), extreme gradient boosting(XGB) and gradient boosting regression(GBR)——to predict the glass transition temperature of polyimides and extract key feature information. The results showed that the optimal predictive model for the glass transition temperature is the integrated XGBoost model, with coefficient of determination(R²) values of 0.956 and 0.811 for the training and test sets, respectively. The root mean square error(RMSE) and mean absolute error(MAE) for the test set are 25.41 and 20.20, respectively. Furthermore, the integrated MACCS fingerprint and DFT models performed better than the individual models. The established integrated model framework provides new insights for the structural design of polyimide materials and other polymer materials.

Key words: Machine learning, Quantum chemistry, Molecular fingerprint, Polyimide

CLC Number: 

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