Siloxane surfactants have been widely explored in the context of cosmetic and technical applications due to their environmental sustainability and easy accessibility. Especially polyether-siloxanes have been well established as an alternative to expensive and persistent fluorosurfactants for the stabilization of water-in-CO2 microemulsions due to their low surface tension and high solubility in supercritical CO2. Several well-defined polyol-siloxane surfactants were successfully synthesized by anionic ring opening polymerisation of ethylene oxide. A variety of alcohols was used as initiators to achieve multifunctional chain ends such as allyl or hydroxyl moieties. Addition of 1,1,1,3,5,5,5-heptamethyltrisiloxane (HMTS) to terminal double bonds via hydrosilylation led to an amphiphilic structure of the polymer. By copolymerization of ethylene oxide with propylene oxide or 2-isopropylidene glyceryl glycidyl ether (IGG) the solubility and consequently the surface-active behaviour of the surfactants can be tailored. By (block)copolymerization with different ratios of allyl glycidyl ether (AGE), leading to a differing siloxane content, a variation of the HLB value and thus adjustable thermal properties and micellization behavior was achieved. All surfactants were characterized by 1H NMR, SEC, MALDI ToF, DSC, TGA, CMC, DLS, and TEM measurements.

Synthesis and application of innovative multifunctional polyol-siloxane surfactants

2019 Spring National Meeting

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