Preparation, characterization and application of polyether and long-chain alkyl co-modified polydimethylsiloxane

Fu, Kangyu; Xu, Meng‐Yao; Zhong, Rui; Yang, Zhenglong; Zhou, Anan

doi:10.1007/s10965-019-1928-9

Cited by 12 publications

(11 citation statements)

References 21 publications

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“…The precursor containing the Si-H bond can be a siloxane polymer, cyclic siloxane oligomer and monomeric silane containing Si-H bond and two substituents prone to hydrolysis at the silicon atom. These reactions are usually catalyzed by platinum compounds [15][16][17][18]. Often encountered in literature is also the method for the synthesis of silicon polyethers by the reaction of hydrothiolation [19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

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Thermodynamic Analysis of Trisiloxane Surfactant Adsorption and Aggregation Processes

Karasiewicz

Krawczyk

2020

Molecules

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The trisiloxane polyether surfactant (3-[3-(hydroxy)(polyethoxy)propyl]-1,1,1,3,5,5,5 -heptamethyltrisiloxane) (TS-EO12) was successfully synthesized by a hydrosilylation reaction in the presence of Karstedt catalyst. The structural analysis of the surfactant was done by 1H-NMR, 13C-NMR, 29Si-NMR and FT-IR analysis. In addition the thermal stability of TS-EO12 was studied by the thermogravimetric measurements. On the one hand the surface properties of TS-EO12 at the water-air interface were investigated by surfactant aqueous solutions surface tension measurements carried out at 293 K, 303 K and 313 K, and on the other the aggregation properties were analyzed based on the solubilization properties of TS-EO12 aggregates at different temperatures. On the basis of the obtained thermodynamic parameters of adsorption and micellization of studied surfactant the temperature impact on its surface and volume properties were deduced. It was proved that the tendency of the studied surfactant molecules to adsorb at the water-air interface and to form micelles weakens with decreasing temperature. It was also concluded that the structure of the adsorption layer changes with temperature. Optical microscopy measurements were used for the TS-EO12 micelle morphology determination.

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Section: Introductionmentioning

confidence: 99%

“…The slope of this dependence is equal to -∆S 0 mic . Knowing the values of ∆S 0 mic , ∆H 0 mic were found from Equation (17). The obtained values of ∆S 0 mic and ∆H 0 mic are presented in Table 2.…”

mentioning

confidence: 99%

Thermodynamic Analysis of Trisiloxane Surfactant Adsorption and Aggregation Processes

Karasiewicz

Krawczyk

2020

Molecules

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“…It was tested that the blends of poly(methylhydrogensiloxane) (PMHS), alkyl alcohol polyether, and 1-dodecene were able to eliminate and inhibit foam formation in sodium dodecylbenzenesulfonate (SDBS) solution in a short duration of time. The reason for this was that the composition of antifoam has a low surface tension, making it an excellent antifoam …”

Section: Opportunities and Challenges Of Antifoams In Acid Gas Removalmentioning

confidence: 99%

“…In recent years, modified silicone antifoams have widely been used in foaming liquid in various industries as they possess various antifoaming properties such as having low-and hightemperature resistance, low surface tension, chemically inert- ness, and no physiological toxicity. 103 For instance, a multicomponent antifoam consisting of polyether-modified silicone has shown excellent potential as an antifoaming agent. 58 Another study demonstrated that the use of antifoam mainly consisting of PPG and a small amount of hydrophobic silica could improve the defoaming ability.…”

Section: Opportunities and Challenges Ofmentioning

confidence: 99%

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Selection Criteria for Antifoams Used in the Acid Gas Sweetening Process

Lau

Partoon

et al. 2021

Ind. Eng. Chem. Res.

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Antifoam plays an essential role in maintaining the continuous removal of acid gases by the absorption process. However, a holistic review of the fundamentals and desirable selection criteria for different types of antifoams for the gas sweetening process is scarcely available. Therefore, this review analyses the selection criteria of each type of antifoam for acid gas sweetening, particularly silicone, polyether glycol, alcohol, and blended-based antifoams. These selection criteria are crucial in defining the properties and antifoaming performance in terms of solubility, dispersibility, surface tension, viscosity, defoaming rate, thermal stability, stability of defoaming performance, potential hazard, and chemical inertness. Hence, this review provides valuable insight into the existing and potential antifoams that could be employed in the acid gas sweetening process along with their distinctive antifoaming ability, benefits, and drawbacks. From this review, blended antifoam is able to fulfill most of the selection criteria and will be further explored in a subsequent study.

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Preparation and performance evaluation of CNF‐enhanced polyether‐modified polysiloxane defoamer

Gao,

Wang,

et al. 2024

J Surfact & Detergents

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In this article, polyether‐modified polysiloxanes were synthesized by the reaction of poly(methyl hydrogen siloxane) (PMHS) with Allyl alcohol polyether B‐400. FT‐IR, laser particle size analysis, hydrophilic–lipophilic balance (HLB) value test, and surface tension measurements were used to characterize its structures and properties. The results show that the control law for the HLB value of polyether‐modified polysiloxanes was obtained as follow: the HLB value increases with increasing hydrogen content of PMHS. When the polyether‐modified polysiloxanes were used to emulsify the polysiloxane, at the HLB value of 10.5, the average particle size of the emulsion was about 0.23 μm with a narrow particle size distribution. The emulsion has good emulsifying and dispersing properties, as well as excellent foam elimination and foam inhibition performance. When the cellulose nanofibrils (CNF) was used as a protective agent for the preparing of the polysiloxane defoamer, the stability of the emulsion does not affect, but its foam elimination and foam inhibition of emulsion can be further improved at the presence of CNF. The lowest surface tension of CNF‐enhanced polyether‐modified polysiloxane defoamer is about 22.4 mN m−1, which has good surface property. When the concentration of CNF‐enhanced polyether‐modified polysiloxane defoamer was 0.1 g L−1, the foam elimination time and foam inhibition time were 5.8 s and 38 min, respectively, at the temperature (80°C) and alkali environment (pH 13).

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Preparation, characterization and application of polyether and long-chain alkyl co-modified polydimethylsiloxane

Cited by 12 publications

References 21 publications

Thermodynamic Analysis of Trisiloxane Surfactant Adsorption and Aggregation Processes

Thermodynamic Analysis of Trisiloxane Surfactant Adsorption and Aggregation Processes

Selection Criteria for Antifoams Used in the Acid Gas Sweetening Process

Preparation and performance evaluation of CNF‐enhanced polyether‐modified polysiloxane defoamer

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