While hydrophilic materials are often characterized by their affinity for water, they can generally be described by their interactions with polar and non-polar substances.  Hydrophilic materials have more thermodynamically favorable interactions with water and other polar solvents, such as ethanol, than they do with oil and non-polar solvents, such as cyclohexane.  Molecular structures making them capable of hydrogen bonding is a primary contributor to the solubility of hydrophilic materials in polar solvents as well as in water.

Hydrophilicity is used to achieve a desired effect in many applications.  Anti-fog coatings exploit high surface energies to flatten water drops rather than allowing them to form light scattering droplets.  Hydrophilic coatings with hydrogen bonding sites allow formation of tightly adherent layers of water with lubricity in biological systems, and the ability to resist oil adsorption in anti-graffiti coatings.  Hydrophilic coatings with ionic sites form antistatic coatings, dye receptive surfaces, and can generate conductive or electrophoretic pathways.  Thick hydrophilic films can behave as polymeric electrolytes in battery and ion conduction applications.  Silane Coupling Agents can be used to tailor surfaces of particles to be both hydrophilic and hydrophobic (See extensive listings in the brochure recommended below).

In general, surfaces become more hydrophilic in the series: non-polar < polar, no hydrogen bonding < polar, hydrogen bonding < hydroxylic, ionic. The number of sites and the structure and density of the interphase area also have significant influence on hydrophilicity.  Much of the discussion of hydrophilicity centers around low contact angles and their measurement.  Low (<40°) contact angles for water are associated with hydrophilicity.

While silicones are inherently hydrophobic, they can be modified to contain hydrophilic groups.  Hydrophilic silicones and siloxanes are widely used as surfactants and emulsifiers.  They consist mainly of dimethylsiloxane backbones in which some of the methyl groups are replaced by polyalkylenoxy- or  pyrrolidone groups with a propyl group as a spacer.  The ratio of silicone to polyalkylenoxy groups affects the properties of the material.  The higher the alkylene oxide content, the higher the hydrophilicity.  Materials with 75% or higher ethylene oxide content are freely soluble in water.  These materials can be used as wetting agents, lubricants, and anti-fog treatments.  Hydroxylic and cationic silicones also can be used as emulsifiers and polyelectrolytes, respectively.  These materials are most importantly used for anti-fog and anti-stat.  Silanes and other metal organics with hydrolysable groups can be used to react to surfaces for imparting hydrophilicity to the surface.  Trisiloxanes are low viscosity materials that have unique wetting, surfactant, and solvency characteristics.  Their unusual characteristics are derived from having a small “cloud” of silicone hydrophobic groups from which the hydrophilic group extends.

Silanes

SIB1660.0

BIS[(3-METHYLDIMETHOXYSILYL)PROPYL]POLYPROPYLENE OXIDE

SIC2445.0

2-CYANOETHYLTRIETHOXYSILANE

SIB1835.5

N,N'-BIS(3-TRIMETHOXYSILYLPROPYL)UREA, 95%

SIT8717.0

TRIS(3-TRIMETHOXYSILYLPROPYL)ISOCYANURATE, tech-95

SIT8192.0

N-(TRIETHOXYSILYLPROPYL)-O-POLYETHYLENE OXIDE URETHANE, 95%

SIT8187.5

N-(3-TRIETHOXYSILYLPROPYL)-4,5-DIHYDROIMIDAZOLE

SIT8398.0

(3-TRIMETHOXYSILYLPROPYL)DIETHYLENETRIAMINE, tech-95

SSP-060

TRIMETHOXYSILYLPROPYL MODIFIED (POLYETHYLENIMINE), 50% in isopropanol

SSP-065

DIMETHOXYSILYLMETHYLPROPYL MODIFIED (POLYETHYLENIMINE), 50% in isopropanol

WSA-7011

AMINOPROPYLSILSESQUIOXANE IN AQUEOUS SOLUTION

SIA0006.0

(3-ACETAMIDOPROPYL)TRIMETHOXYSILANE

SIA0599.4

N-3-[(AMINO(POLYPROPYLENOXY)]AMINOPROPYLTRIMETHOXYSILANE, 60 - 65%

SIB1824.82

N,N'-BIS-[(3-TRIETHOXYSILYLPROPYL)AMINOCARBONYL]POLYETHYLENE OXIDE (10-15 EO)

SIM6492.7

2-[METHOXY(POLYETHYLENEOXY)6-9PROPYL]TRIMETHOXYSILANE, tech-90

SIB1140.0

N,N-BIS(2-HYDROXYETHYL)-3-AMINOPROPYLTRIETHOXYSILANE, 62% in ethanol

SIB1142.0

N,N'-BIS(2-HYDROXYETHYL)-N,N'-BIS(TRIMETHOXYSILYLPROPYL)ETHYLENEDIAMINE, 66-68% in methanol

SIB1824.4

2,2-BIS(3-TRIETHOXYSILYLPROPOXYMETHYL)BUTANOL, 50% in ethanol

SIT8189.0

N-(3-TRIETHOXYSILYLPROPYL)GLUCONAMIDE, 50% in ethanol

SIT8189.5

N-(3-TRIETHOXYSILYLPROPYL)-4-HYDROXYBUTYRAMIDE

SIC2263.0

CARBOXYETHYLSILANETRIOL, DISODIUM SALT, 25% in water

SIB1500.0

BIS(METHOXYETHYL)-3-TRIMETHOXYSILYLPROPYLAMMONIUM CHLORIDE, 60% in methanol

SIT8192.2

TRIETHOXYSILYLPROPYL(POLYETHYLENEOXY)PROPYLPOTASSIUM SULFATE, 45-50% in ethanol

SIT8378.3

3-(TRIHYDROXYSILYL)-1-PROPANESULFONIC ACID, 30-35% in water

SIT8378.5

3-(TRIHYDROXYSILYL)PROPYL METHYLPHOSPHONATE, MONOSODIUM SALT, 42% in water

SIT8395.0

4-(TRIMETHOXYSILYLETHYL)BENZYLTRIMETHYLAMMONIUM CHLORIDE, 60% in methanol

SIT8402.0

N-(TRIMETHOXYSILYLPROPYL)ETHYLENEDIAMINETRIACETATE, TRISODIUM SALT, 35% in water

SIT8405.0

S-(TRIMETHOXYSILYLPROPYL)ISOTHIOURONIUM CHLORIDE, 50% in water

SIT8412.0

N-TRIMETHOXYSILYLPROPYL-N,N,N-TRI-n-BUTYLAMMONIUM BROMIDE, 50% in methanol

Silicones

DBE-712

DIMETHYLSILOXANE-(60-70% ETHYLENE OXIDE) BLOCK COPOLYMER, 20 cSt

DBP-732

DIMETHYLSILOXANE-[65-70%(60% PROPYLENE OXIDE/40% ETHYLENE OXIDE)] BLOCK COPOLYMER, 1,800 cSt

DBE-224

DIMETHYLSILOXANE-(25-30% ETHYLENE OXIDE) BLOCK COPOLYMER, 400 cSt

QMS-435

35-45% (TRIMETHYLAMMONIUM METHYLPHENETHYL)- METHYLSILOXANE - 55-65% DIMETHYLSILOXANE copolymer, chloride salt

CMS-222

(HYDROXYPROPYLENEOXYPROPYL)METHYLSILOXANE - DIMETHYLSILOXANE COPOLYMER, 150-200 cSt

AKT841

O-ALLYLOXY(POLYETHYLENEOXY)TRIISOPROPOXYTITANATE, 95%

SIT8192.0

N-(TRIETHOXYSILYLPROPYL)-O-POLYETHYLENE OXIDE URETHANE, 95%

SIM6492.7

2-[METHOXY(POLYETHYLENEOXY)6-9PROPYL]TRIMETHOXYSILANE, tech-90

SIH6185.0

3-[HYDROXY(POLYETHYLENEOXY)PROPYL]HEPTAMETHYLTRISILOXANE, 90%

SIM6492.6

2-[METHOXY(POLYETHYLENEOXY)6-9PROPYL]HEPTAMETHYLTRISILOXANE, tech-90

SIA0075.0

3-{2-[ACETOXY(POLYETHYLENEOXY)PROPYL]}HEPTAMETHYLTRISILOXANE, tech-95

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Copyright 1991 - 2017 Gelest, Inc.