Multiple shape memory effects of polyimide nanocomposites based on octa(aminophenyl) silsequioxanes
J. Yao, S. Ma, J. Zhang, Y. Wang, C. Wang, H. Zhou, C. Chen, G. Liu
Vol. 15., No.5., Pages 433-444, 2021
DOI: 10.3144/expresspolymlett.2021.37
DOI: 10.3144/expresspolymlett.2021.37
Corresponding author: G. Liu 
GRAPHICAL ABSTRACT
ABSTRACT
This work reports the synthesis of a series of shape memory polyimides by polycondensation of 2,2′-bis[4-(3-aminophenoxy)phenyl]hexafluoropropane (m-6FBAPP), 4,4′-(hexafluoroisopropylidene) (6FDA) and PA-terminated OAPS. The influence upon shape memory properties by the introduction of PA-terminated OAPS was investigated systematically in both experiments and simulations. PA-terminated OAPS acted as both a plasticizer and a rigid cage structure, preventing excessive movement of the polymer chain. Thus, both strain and shape recovery values of the resulting polyimide composites strongly depended on the content of PA-terminated OAPS. The shape memory polyimide composites showed high strain and recovery values equal to 247 and 94.3%, respectively. Additionally, these polyimide composites showed multiple shape memory effects and excellent shape memory cycle stability.
