Abstract:
Three kinds of SiO
2 sols containing amorphous nano-silica (nano A-SiO
2), spherical nano-silica (nano S-SiO
2), and layered hexagonal nano-silica (nano LH-SiO
2) particles were controllably synthesized by tailoring the hydrolysis of sodium silicate. By in-situ reaction between SiO
2 sols and hydrophilic polyurethane (HPU) prepolymer, synthesizing from diisocyanate and polyether polyol, a series of nano-silica modified hydrophilic polyurethane composites (nano SiO
2/HPU) were obtained. The structure and properties of HPU and nano SiO
2/HPU were characterized by ATR-FTIR, TEM, SEM and mechanical properties. The results show that PEG plays a regulating role in the formation of nano-silica particles in SiO
2 sol, and the morphology of nano-silica particles affects the mechanical properties of nano SiO
2/HPU grouting composites differently. Specifically, nano S-SiO
2/HPU exhibits higher compression strength, and nano LH-SiO
2/HPU possesses better toughness.
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