

FOLLOWUS
Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China
linyu@ecust.edu.cn (Y.L.)
wgz@ecust.edu.cn (G.Z.W.)
Received:07 April 2019,
Revised:2019-5-9,
Accepted:20 May 2019,
Online First:30 August 2019,
Published:2020-01
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Citation: Hu, S. N.; Lin, Y.; Wu, G. Z. Nanoparticle dispersion and glass transition behavior of polyimide-grafted silica nanocomposites. Chinese J. Polym. Sci. 2020, 38, 100–108
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.
Citation: Hu, S. N.; Lin, Y.; Wu, G. Z. Nanoparticle dispersion and glass transition behavior of polyimide-grafted silica nanocomposites. Chinese J. Polym. Sci. 2020, 38, 100–108 DOI: 10.1007/s10118-019-2300-6.
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.
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
$${ {\textit{σ}} \cdot {N^{0.5}} \ll {\left( {N/P} \right)^2}}$$
http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=32496580&type=
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.
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