NDLI: Surface hydrophobicity alteration of fractionated paraffin wax, crude by-product polyolefin wax and their blend

Content Provider	Springer Nature Link
Author	Lee, Eun Ju Lee, Yong Se Lim, Kwang Hee
Copyright Year	2010
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$^{−11}$ cm$^{2}$/s and 1.96×10$^{−11}$ cm$^{2}$/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$^{−12}$ cm$^{2}$/s, 7.23×10$^{−11}$ cm$^{2}$/s and 1.50×10$^{−11}$ cm$^{2}$/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$^{−11}$ cm$^{2}$/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.
Starting Page	518
Ending Page	523
Page Count	6
File Format	PDF
ISSN	02561115
Journal	Korean Journal of Chemical Engineering
Volume Number	27
Issue Number	2
e-ISSN	19757220
Language	English
Publisher	Springer US
Publisher Date	2010-02-06
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Crude By-product Polyolefin Wax Commercial Paraffin Wax Blend Surface Hydrophobicity Diffusivity Surface Enrichment Industrial Chemistry/Chemical Engineering Catalysis Materials Science Biotechnology
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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