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Synthesis and surface‐active properties of a trisiloxane‐modified oligo(propylene oxide‐ block ‐ethylene oxide) wetting agent
Author(s) -
Kim DooWon,
Noh SiTae
Publication year - 2004
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.20284
Subject(s) - wetting , ethylene oxide , propylene oxide , critical micelle concentration , polymer chemistry , oxide , aqueous solution , materials science , chemistry , micelle , chemical engineering , copolymer , organic chemistry , composite material , engineering , polymer
Polydisperse 1,1,1,3,5,5,5‐heptamethyltrisiloxane‐oligo(propylene oxide‐ block ‐ethylene oxide) wetting agents were synthesized through the hydrosilylation of 1,1,1,3,5,5,5‐heptamethyltrisiloxane (HMTS) with active hydrogen and allyl oligo(propylene oxide‐ block ‐ethylene oxide) [allyl oligo(PO‐ b ‐EO)] with hexachloro dihydrogen platinate(IV) as a catalyst. Allyl oligo(PO‐ b ‐EO) with a hydrophilic–hydrophobic balance was synthesized through the combination of propylene oxide (PO) and ethylene oxide with allyl alcohol. The wetting agents with a hydrophilic–hydrophobic balance were synthesized. The aqueous solutions of the wetting agents (0.1 wt %) were almost visibly turbid. An increase in the number of hydrophobic groups of HMTS and PO for the wetting agents resulted in a lower critical solution temperature. Lower surface tensions of 20–25 dyn/cm were found above the critical micelle concentration (cmc), and they decreased with an increase in the number of hydrophobic groups. The cmc's were below 0.01 wt %, decreasing with as the number of hydrophobic groups increased. The wetting power and emulsion stability for the oil‐in‐water systems increased as the concentration of the wetting agents increased, and they decreased as the number of hydrophobic groups increased. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 3292–3302, 2004