A First Ten Angstroms (FTA) 200 dynamic contact angle analyzer was used to place droplets of water, methylene iodide, and formamide on the tangential surface of the blocks.
Water and methylene iodide exhibited higher initial contact angles and higher K values for Douglas-fir than for southern yellow pine, but in contrast, the formamide exhibited higher initial contact angles in Douglas-fir than in southern yellow pine but lower K values in Douglas-fir than in southern yellow pine.
Burch (2015) used water and methylene iodide to obtain K values and equilibrium contact angles on specimens prepared from the same trees used in this study.
The contact angles of polar testing liquids (water, ethylene glycol, formamide, and methylene iodide) decreased with time of the activation, and in opposite the contact angles of nonpolar solvent (1-bromo naphthalene) increased.
The contact angles of polar testing liquids increased with time elapsed from modification of LDPE foils by SDBD plasma in oxygen (water, formamide, ethylene glycol, methylene iodide), and in opposite the contact angles decreased with the ageing time for nonpolar liquid, i.e., bromo naphthalene.
Contact angles with water and
methylene iodide were then measured and the dispersion and polar components of solid surface tension were calculated (see ASTM D7490 for details).
One dense liquid needed was
methylene iodide, which was not available in Australia.
Cyclopropyl bromosilane was prepared for the first time by cyclizing trimethoxy vinyl silane with
methylene iodide using the Simmons-Smith reaction.
The data in Table 3 shows water and
methylene iodide contact angle measurements with six different panels (different basecoat and cleareoat compositions).
The present investigation took this change into account when calculating the dispersion and polar components of the surface free energy from water and methylene iodide contact angles.
Therefore, the objective of this study was to determine the effect of UV/[O.sub.3] treatment on three polymer surfaces--PMMA, polycarbonate, and poly(tetrafluo-roethylene) (PTFE)--by measuring contact angles of water and methylene iodide as a function of irradiation time.
A microsyringe was used to place either a water dro or a methylene iodide drop on the polymer surface with sufficient volume to provide a base of more than 0.6 cm.