

FOLLOWUS
a.Key Laboratory of Engineering Plastics, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
b.University of Chinese Academy of Sciences, Beijing 100049, China
ylsu@iccas.ac.cn
Received:28 February 2022,
Revised:2022-3-31,
Accepted:07 April 2022,
Online First:20 July 2022,
Published:01 November 2022
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Ju, W. L.; Li, S. F.; Su, Y. L.; Wang, D. J. Controllable synthesis of a well-defined polypropylene grafted silica nanoparticles and its effect on crystallization behavior of polypropylene. Chinese J. Polym. Sci. 2022, 40, 1411–1421
Wei-Long Ju, Shao-Fan Li, Yun-Lan Su, et al. Controllable Synthesis of a Well-defined Polypropylene grafted Silica Nanoparticles and Its Effect on Crystallization Behavior of Polypropylene[J]. Chinese Journal of Polymer Science, 2022, 40(11): 1411-1421.
Ju, W. L.; Li, S. F.; Su, Y. L.; Wang, D. J. Controllable synthesis of a well-defined polypropylene grafted silica nanoparticles and its effect on crystallization behavior of polypropylene. Chinese J. Polym. Sci. 2022, 40, 1411–1421 DOI: 10.1007/s10118-022-2756-7.
Wei-Long Ju, Shao-Fan Li, Yun-Lan Su, et al. Controllable Synthesis of a Well-defined Polypropylene grafted Silica Nanoparticles and Its Effect on Crystallization Behavior of Polypropylene[J]. Chinese Journal of Polymer Science, 2022, 40(11): 1411-1421. DOI: 10.1007/s10118-022-2756-7.
Well-defined polypropylene grafted silica nanoparticles (PP-g-SiO
2
) with controlled grafting density were prepared by “grafting-to” method
which were dispersed in PP matrix to prepare nanocomposites via solution blending. The PP-g-SiO
2
with high molecular weight of grafted chains provided a great number of heterogeneous nucleation sites
which significantly improved the crystallization abilities of nanocomposites.
Well-defined polypropylene grafted silica nanoparticles (PP-
g
-SiO
2
) were prepared through the reaction of maleic anhydride grafted polypropylene (PP-
g
-MAH) with amino-functionalized silica (SiO
2
-NH
2
) by the 'grafting-to' method. The grafting density of PP-
g
-SiO
2
is found to be controlled by the concentration of silane coupling agent 3-[2-(2-aminoethylamino) ethyl amino] propyl trimethoxy silane (TAMS). The maximum grafting density of grafted PP-
g
-MAH chains with molecular weight of 9100 g/mol could reach 0.34 chains/nm
2
when the critical concentration of TAMS was 0.0194 mol/L. The critical concentration of TAMS can be explained by the maximum amounts of primary amino groups
which can totally react with PP-
g
-MAH on the surface of SiO
2
-NH
2
when the silane monolayer is formed. The synthesized PP-
g
-SiO
2
with different molecular weights was mixed with PP by solution mixing to form a series of nanocomposites. The crystallization temperature (
T
c
) of nanocomposites increased significantly with the particle loading. The PP-
g
-SiO
2
with high molecular weight of grafted chains exhibits a high nucleation ability at 1 wt% nanoparticle loading in PP/PP-
g
-SiO
2
nanocomposites. In summary
we provide an effective method to synthesize the well-defined PP-
g
-SiO
2
with controlled grafting density
which shows excellent nucleation ability.
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