2. Experimental 2.1 Materials Nano-CaCO3 particles (D50: 30−70 nm by TEM (Fig. 1) and BET: ca.17m2·g-1) were supplied by Shanghai Zhuoyue Nanotech Corporation. Methyl methacrylate (MMA, Shanghai Lingfeng Chemicals) was purified ... 2. Experimental
2.1 Materials
Nano-CaCO3 particles (D50: 30−70 nm by TEM (Fig. 1) and
BET: ca.17m2·g-1) were supplied by Shanghai Zhuoyue
Nanotech Corporation. Methyl methacrylate (MMA, Shanghai
Lingfeng Chemicals) was purified by distillation under reduced
pressure; potassium persulphate (K2S2O8, initiator, Shanghai
Lingfeng Chemicals) was of chemical grade. Silane coupling
agent A174 (γ-methacryloxypropyltrimethoxysilane) was purchased
from Shanghai Yaohua Factory. Polyvinylchloride
(PVC, WS-1000S) was supplied by Shanghai Chlor-Alkali
Chemical Co., Ltd.
Fig. 1 Morphology of untreated CaCO3 nanoparticles.
Fig. 2 Morphology of PMMA-coated CaCO3 nanoparticles.
2.2 PMMA emulsion polymerization on CaCO3
nanoparticles
2.2.1 Surface silanation of nano-CaCO3 particles
The nano-CaCO3 particles were homogeneously dispersed
in ethanol (solid content 20%) by a sonication dispersion
equipment. The slurry was then heated to 80°C
with stirring, and the silane coupling agent A174 (5%, calculated
based on the weight of nano-CaCO3 particles) was
added into the slurry. After the slurry was stirred for
120 min at 80°C, it was filtered and the filter cake was then
dried at 120°C in low vacuum for 120 min to obtain silanated
CaCO3 powders.
PMMA has good compatibility with PVC due to specific
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