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6620505 
Journal Article 
Synthesis of Ultra-high Molecular Weight SiO2-g-PMMA Particle Brushes 
Wang, Z; Matyjaszewski, K; Liu, T; Lin, KC; Li, S; Yan, J; Olszewski, M; Sobieski, J; Pietrasik, J; Bockstaller, MR; , 
2020 
Yes 
Journal of Inorganic and Organometallic Polymers and Materials
ISSN: 1574-1443
EISSN: 1574-1451 
SPRINGER 
DORDRECHT 
30 
1 
174-181 
English 
WOS:000509910600014 
A simple route to synthesize ultra-high molecular weight particle brushes by surface-initiated atom transfer radical polymerization (SI-ATRP) from silica nanoparticles was developed. SiO2-g-PMMA and SiO2-g-PS particle brushes were prepared with different [SiO2-Br](0) concentration of initiating sites on the surface of the nanoparticles. Ultra-high MW (> 10(6)) SiO2-g-PMMA particle brushes with narrow molecular weight distribution (< 1.3) and different grafting densities were synthesized. The grafting density of SiO2-g-PMMA particle brushes decreased with increasing target degree of polymerization. The same conditions were applied to the synthesis of SiO2-g-PS particle brushes. However, due to the lower propagation rate constant of styrene, coupling between SiO2-g-PS particle brushes occurred and also some fraction of unattached homopolystyrene was generated by the thermal self-initiation of styrene, preventing successful synthesis of ultra-high MW SiO2-g-PS particle brushes. 
Particle brush; SI-ATRP; Ultra-high molecular weight