Surface hydrophobicity alteration of fractionated paraffin wax, crude by-product polyolefin wax and their blend |
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Authors: | Eun Ju Lee Yong-Se Lee Kwang-Hee Lim |
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Affiliation: | (1) School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Shinlim-dong, Kwanak-ku, Seoul , 151-744, South Korea;(2) SK Energy Corporation, Yuseong-ku, Daejeon, 305-712, South Korea; |
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Abstract: | The surface compositions of crude by-product polyolefin wax (wax K) from a naphtha cracking unit, fractionated commercial
paraffin wax (wax J) and their blend (wax M) were compared, under various conditions, by using FT-IR. Then a practical criterion
was theoretically derived by back-of-the-envelope-calculation to estimate the diffusivity for the surface enrichment of hydrophilic
functional groups. The hydrophobicity in terms of chemical structure and functional groups was altered by changing the environment
as well as by blending wax K with wax J. The surface properties of wax J and wax M turned out more hydrophobic than that of
wax K within the experimental period of water-submerged condition, even though the structure and functional groups on the
surfaces of all waxes under ambient atmospheric condition are extremely similar. Thus the blend of wax M behaved unlike wax
K but similarly to wax J in terms of alteration of hydrophobicity. Such values of diffusivity as 1.35×10−11 cm2/s and 1.96×10−11 cm2/s are established for wax J and wax M, respectively, under 1 day water-submerged condition. Furthermore, under 1 week water-submerged
condition, the values of their diffusivity for wax J, wax K and wax M are estimated as 3.06×10−12 cm2/s, 7.23×10−11 cm2/s and 1.50×10−11 cm2/s, respectively. The obtained values of diffusivity are consistent, in terms of the order of magnitude, with the value of
diffusion coefficient of 5.75×10−11 cm2/s obtained, using a very complicated empirical-formula, by Chen et al. for the investigation of surface-modifier enrichment.
Thus, the suggested criterion may be very useful and practically applied to clarify the process of surface enrichment from
general polymer-blends. |
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