Abstract
We present the synthesis and characterization of silica particles modified by a poly(ionic liquid), namely, poly[2-(methacryloyloxy)ethyl]trimethylammonium tetrafluoroborate (P[MATMA][BF4]), which has a strong carbon dioxide absorption, and its application as a nucleation agent in polymer foaming. Silica particles with different particle sizes were fabricated by the sol–gel method and then grafted with (P[MATMA][BF4]) brushes by surface-initiated atom-transfer radical polymerization. The modified silica particles (SiO2P[MATMA][BF4]) were introduced into a polystyrene matrix by solution blending. The (P[MATMA][BF4]) brushes grafted onto the silica particles were able to slightly increase the carbon dioxide solubility, and consequently, SiO2P[MATMA][BF4] showed a higher heterogeneous nucleation efficiency in the foaming process compared to amino-functionalized silica particles (SiO2NH2) used as control.
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