Abstract
Poly ion complexes of anionic lignosulfonic acid (LSA) with cationic poly(2-vinyl pyridine) or poly(4-vinyl pyridine) were prepared by mixing the polymer solutions in dimethyl sulfoxide or dilute hydrochloric acid. The complexes were formed as soon as the polymer solutions were mixed. Fourier transform infrared (FTIR) measurements for the complexes revealed the presence of strong ionic interactions between sulfonate anions of LSA and pyridinium cations of the vinyl pyridine (VPy) polymers. The strong interaction was supported by detection of a glass transition temperature (T g) much higher than pristine T g values of VPy polymers in differential scanning calorimetry. By using the ionic complexation, a coating of LSA onto VPy polymer films was undertaken to modify their original surface property. Formation of a thin complex film was confirmed by observation of absorption bands that are characteristic of the pyridinium cation in reflection FTIR spectra measurements, and by visualization of the attached LSA component in atomic force microscopy. This treatment resulted in the surface of the VPy polymer films becoming hydrophobic. An adhesion test was also conducted by pasting two veneered woods with the polymer complex, followed by shear-tearing them off. The adhesive strength of the complex was estimated to be 1.1 MPa.
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Part of this report was presented at the 55th (Kyoto, March 2005) and 56th (Akita, August 2006) Annual Meetings of the Japan Wood Research Society
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Hasegawa, D., Teramoto, Y. & Nishio, Y. Molecular complex of lignosulfonic acid/poly(vinyl pyridine) via ionic interaction: characterization of chemical composition and application to material surface modifications. J Wood Sci 54, 143–152 (2008). https://doi.org/10.1007/s10086-007-0922-8
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DOI: https://doi.org/10.1007/s10086-007-0922-8