Shape memory polyimide composites with high storage modulus and high glass transition temperature

Abstract

Shape memory polymers (SMPs) are smart materials that can be programmed to change shape under external stimuli, whereas the low storage modulus limit the application of them. Herein, carbon fabric (CF) reinforced shape memory polyimide composites (SMPICs) with high storage modulus were manufactured via hot pressing molding process. Firstly, we synthesized one kind of thermoplastic shape memory polyimide (SMPI) with glass transition temperature of 205°C by the two-step high-temperature solution polycondensation. In addition, the triamine was added in the SMPI system as a crosslinking agent to form the thermosetting SMPI with different crosslinking degree. In order to improve the storage modulus of SMPI, the CFs with three layers were embedded in thermosetting SMPI matrix. The storage modulus of the obtained SMPICs was as high as 26 GPa. The glass transition temperature and thermal decomposition temperature of SMPICs were up to 213°C and 505°C, respectively. Moreover, the shape fixation rate and recovery rate of SMPICs were both more than 94%. These SMPICs with high storage modulus is of great significance, proving more application potential in many fields such as aerospace.

Shape memory behavior of novel Ethylene Propylene Diene Monomer (EPDM)/paraffin foams

“…A sharp drop and a reduction at least of 2 orders of magnitude in storage modulus are required to achieve an excellent shape memory effect. [ 40 ] Consequently, optimum shape memory performance can be expected in EPDM_H_P60 and EPDM_MP_P60 foams.…”

Review of tribological properties of polyimide-based composite materials

“…This indicates that the graphene quantum dots added to the PI matrix by in situ polymerization have good dispersion. In addition, the researchers synthesized a nanocomposite film composed of reduced graphene oxide (r-GO), silicon carbide and thermosetting polyimide by in situ polymerization (Li et al , 2021). The resultant nanocomposite films exhibited significant improvements in mechanical, tribological and thermal properties.…”

Dynamic mechanical response and deformation mechanism of poly (ε-caprolactone) (PCL) / epoxy resin(EP) shape memory polymer composites

“…Shape memory polymers (SMPs) are a sub-class of shape memory materials in the field of smart materials, which can recover from a temporary configuration to their original shape under the external stimuli of heat (Li et al, 2022; Wang et al 2023b), light (Bai et al, 2021; Zhang et al, 2023), magnetic field (Liu et al, 2023; Ze et al, 2020), and chemicals (Guo et al, 2015; Wang et al, 2023a). And SMPs have attracted lots of attention due to their advantages of excellent shape memory performance, large specific density, and high specific modulus, which have a great application in the fields of sensors, medical treatment, and aerospace engineering.…”