Abstract
Poly(vinyl alcohol)/ionic liquid (PVA/[BMI]Cl) gelatinous composites were prepared and used to study ultrasound (US)-responsive behavior in the shear viscosity, viscoelasticity, and Fourier transform infrared (FT-IR) spectra before and after 43 kHz of US exposure. PVA compounds with different molecular weights were mixed with imidazole ionic liquid in aqueous solution to form a gelatinous complex. The shear viscosity and viscoelasticity of PVA/[BMI]Cl composites decreased under US exposure and increased gradually to the original value after the removal of US exposure. The FT-IR results showed that the US enhanced the intensities of the OH stretching region in 3000–3600 cm–1. Two-dimensional correlation spectroscopy and deconvolution of the FT-IR spectra suggested that US exposure deformed hydrogen bonds in the composites of PVA/[BMI]Cl. These results showed that hydrogen bonds formed between [BMI]Cl and PVA were broken by US exposure. As a result, the composites of PVA/[BMI]Cl could respond to US exposure.
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