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    Effect of siloxane backbone length on the physicochemical properties of gluconamide-modified polysiloxane surfactants

    Year: 2020

    Journal: J. Mol. Liq., Volume 311, AUG 1

    Authors: Zhou, Xiyang; Bai, Yanyun; Guo, Lingxiao; Wang, Guoyong

    Organizations: National Key Research and Development Program [2017YFB0308704]; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [21872088]

    Keywords: Gluconamide-modified polysiloxane; Surface activity; Softness; And-yellowing properties

    Three isostructural gluconamide-modified polysiloxane (GL@Si) surfactants of varying siloxane backbone lengths (molecular weights) were designed and synthesized via an amidation reaction. Their physicochemical properties and potential applications are discussed herein. Each of the three GL@Sis exhibits good surface activity. The critical aggregation concentrations (CAC) of GL@Sis solutions decrease with increasing siloxane backbone length. Surface tension at the CAC (gamma(CAC)) increases with molecular weight. Dynamic surface tension results indicate that lower molecular weight GL@Sis exhibit improved diffusion ability compared to larger GL@Sis. Contact angle measurements indicate that lower molecular weights and higher concentrations of GL@Sis produce smaller equilibrium contact angles. Emulsifying measurements reveal that GL@Sis forms better emulsions with soybean oil than liquid paraffin, with lower molecular weight GL@Sis demonstrating superior emulsifying capabilities. Moreover, GL@Sis exhibit good foamability and foam stability. GL@Sis possess smoothness, softness, and antiyellowing properties. The fiber surface is visually smooth after finishing with GL@Si4-8. (C) 2020 Elsevier B.V. All rights reserved.
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