Synthesis and Characterization of Silicone‐Based Surfactants as Anti‐Foaming Agents

Abstract

Silicone-based amphiphilic surfactants were synthesized as anti-foaming agents through a polycondensation reaction between chlorine-terminated polysiloxane and polyethers. Poly(ethylene glycol) (PEG) and poly(propylene glycol) of different molecular weights were used. The structures of these tri-block co-polymers were characterized by FTIR, 1 H NMR and ESI-MS analysis. Surface tension, foam height and foam destruction properties of these co-polymers were determined. Spectroscopic analysis confirmed that bonding of polyether to polysiloxane was successful and two types of different tri-block co-polymers were obtained. The anti-foaming efficiency of these co-polymers tended to increase with an increase in the hydrophilic character of the co-polymer chains. The synthesized tri-block co-polymers, which can be used as anti-foaming agents in paper-coating applications of poly(vinyl acetate-co-butyl acrylate) latexes, showed low surface tension values, fast liquid drainage and efficient foam destruction. PEG 200-b-PDMS-b-PEG 200 was determined to be the most efficient anti-foaming agent among all co-polymers synthesized.

Dyeing Chemicals

“…The PDMS chain gains its hydrophilic character by modification with poly (ethylene glycol) (PEG) and poly (propylene glycol) (PPG). PEG and PPG are water-soluble polymers that allow materials to retain good water swellability [43]. A decrease in foaming occurs with an increase in the hydrophilicity of the co-polymers.…”

“…When the hydrophilicity of the copolymers increased, the micro foams were removed more effectively. Kekevi et al [43] demonstrate that the uniqueness of these anti-foaming agents is caused by two properties-flexibility, which enhances the acquired conformations that result in efficient packing at various interfaces and lower cohesive energy, which is derived from the cross-sectional area of the siloxane at the interface (Scheme 6).…”

Synthesis of a novel silicone based copolymeric surfactant and application in emulsion polymerization

“…Among various hydrophobic systems, silicone-containing surface active agents are well known and applied in different fields, such as polyurethane foam additives [9,10], in textile manufacture, cosmetic formulations, as agricultural adjuvants and as paint additives [11,12]. Silicone surfactants are amphiphilic materials containing methylated siloxane hydrophobes, such as poly (dimethyl siloxane), trimethylsilyl groups coupled to one or more polar groups [13,14], especially polyether units, e.g., poly(ethylene oxide) (PEO) and pluronics [15,16].…”

Monitoring structural evolution of organosilicate species during sol–gel processes by electrospray ionization mass spectrometry

“…Hybrid materials have generated much interest due to their distinct advantages such as increased thermal and chemical stability, high mechanical strength and excellent resistance against oxidation . Polysiloxanes starting from the organosiloxane monomer, (3‐chloropropyl) trimethoxysilane (CPTMS), are building blocks in the construction of novel hybrid materials, which have broad applications in coatings, foams, films and coupling agents . Typically, CPTMS‐derived materials are produced through a traditional sol–gel process under acidic or basic conditions .…”

“…[1][2][3][4][5] Polysiloxanes starting from the organosiloxane monomer, (3-chloropropyl) trimethoxysilane (CPTMS), are building blocks in the construction of novel hybrid materials, which have broad applications in coatings, foams, films and coupling agents. [6][7][8][9][10] Typically, CPTMSderived materials are produced through a traditional sol-gel process under acidic or basic conditions. [11,12] The properties of the resulting polysiloxanes depend on the ratio of water to silane (r), reaction time, and temperature.…”