TITLE:
Synthesis and Characterization of Poly (Methyl Methacrylate)/Polyethylenimine Grafting Core-Shell Nanoparticles for CO2 Adsorption Using Soap-Free Emulsion Copolymerization
AUTHORS:
Jun-Won Kook, Ji Young Lee, Ki Seob Hwang, In Park, Jung Hyun Kim, Jun-Young Lee
KEYWORDS:
Polyethylenimine, Core-Shell Nanoparticle, CO2 Adsorption, Grafting Reaction, Soap-Free Emulsion
JOURNAL NAME:
Advances in Materials Physics and Chemistry,
Vol.6 No.7,
July
20,
2016
ABSTRACT: Unlike previous
emulsion polymerization, we used grafting reactions in soap-free emulsion systems.
In this study, we synthesized grafted PMMA/PEI core-shell nanoparticles by
varying the MMA/PEI content and molecular weight of PEI (Mn = 600,
8000, and 10,000). The size and morphology of the core-shell nanoparticles were
characterized by a particle size analyzer and scanning electron microscopy. The
nanoparticles were 178 - 408 nm in diameter and swelled in water or methanol by
30 - 75 nm. The size of the nanoparticles increased with MMA contents, whereas
the size distribution progressively became homogeneous with increasing
molecular weight of PEI. Lastly, we measured CO2 adsorption capacity
of the grafted PMMA/PEI core-shell nanoparticles, and we found the capacity to
be limited at a level of 0.69 mg, which occurred for nanoparticles prepared
from emulsions at a pH value of 11.