The utilization of adhesive bonding has attracted a growing concern in the field of automobile manufacturing, which requires the development of easy disassembly techniques for the reuse and recycling of body materials. In this study, we examined the immersion of adhesive joints in pure water and sodium chloride (NaCl) solution as a pre-treatment of such a separation process. Regardless of the adhesive types, the immersion treatment increased the water content of adhesives, which led to their plasticization and volume expansion, determined by DSC and FT-IR analyses. Along with this, the tensile strength, dielectric strength, and volume resistivity of adhesive were found to greatly decrease, and this decreasing trend was more visible with lower NaCl concentration. Overall, our results suggested that immersion treatment can be a promising pre-treatment for an easy disassembly process with manual dismantling or electric pulse method.

In general, the solvent extraction behavior of Pt(IV) and Pd(II) by many amine extractants and solvating extractants is similar, so the separation of Pt(IV) and Pd(II) is not good. Therefore, the separation of Pt(IV) and Pd(II) by extractants other than amine extractants and solvating extractants has been investigated.

In the present study, the extraction and separation of Pt(IV) and Pd(II) from hydrochloric acid solutions by mixed extractants of APT 6500 as an acidic extractant, and TBP as a solvating extractant were investigated. It was found that extraction of Pd(II) can be suppressed and Pt(IV) can be preferentially extracted and separated by mixing APT 6500 and TBP in an appropriate ratio. In addition, good separation of Pt(IV) and Pd(II) was obtained regardless of the concentration of hydrochloric acid by using mixed extractants with APT 6500 and TBP concentrations adjusted to about 10 vol% each.