Citation: Sha-Ni Hu, Yu Lin, Guo-Zhang Wu. Nanoparticle Dispersion and Glass Transition Behavior of Polyimide-grafted Silica Nanocomposites[J]. Chinese Journal of Polymer Science, ;2020, 38(1): 100-108. doi: 10.1007/s10118-019-2300-6 shu

Nanoparticle Dispersion and Glass Transition Behavior of Polyimide-grafted Silica Nanocomposites

Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China

Corresponding author: Yu Lin, linyu@ecust.edu.cn Guo-Zhang Wu, wgz@ecust.edu.cn
Received Date: 7 April 2019
Revised Date: 9 May 2019
Available Online: 30 August 2019

How to control the spatial distribution of nanoparticles to meet different performance requirements is a constant challenge in the field of polymer nanocomposites. Current studies have been focused on the flexible polymer chain systems. In this study, the rigid polyimide (PI) chain grafted silica particles with different grafting chain lengths and grafting densities were prepared by " grafting to” method, and the influence of polymerization degree of grafted chains (N), matrix chains (P), and grafting density (σ) on the spatial distribution of nanoparticles in the PI matrix was explored. The glass transition temperature (T_g) of PI composites was systematically investigated as well. The results show that silica particles are well dispersed in polyamic acid composite systems, while aggregation and small clusters appear in PI nanocomposites after thermal imidization. Besides, the particle size has no impact on the spatial distribution of nanoparticles. When \begin{document}${ {\textit{σ}} \cdot {N^{0.5}} \ll {\left( {N/P} \right)^2}}$\end{document}, the grafted and matrix chains interpenetrate, and the frictional resistance of the segment increases, resulting in restricted relaxation kinetics and T_g increase of the PI composite system. In addition, smaller particle size and longer grafted chains are beneficial to improving T_g of composites. These results are all propitious to complete the microstructure control theory of nanocomposites and make a theoretical foundation for the high performance and multi-function of PI nanocomposites.
- Polyimide grafted nanoparticle,
- Dispersion morphology,
- Glass transition temperature
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