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CAS NO.102782-97-8 Epoxypropoxypropyl Terminated Polydimethylsiloxane |
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Product Name |
Epoxypropoxypropyl Terminated Polydimethylsiloxane |
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Synonyms |
Siloxanes and Silicones, di-Me, 3-(2-oxiranylmethoxy)propyl group-terminated; Glycidoxypropyl-terminated Polydimethylsiloxane; Epoxy Functional Silicone Fluid; Polydimethylsiloxane, Epoxypropoxypropyl Terminated |
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CAS NO. |
102782-97-8 |
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Appearance |
Colorless to light yellow transparent liquid |
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Viscosity |
100~140 |
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MF |
C16H34O5Si2 (representative formula; polymer, variable by grade) |
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MW |
363 (representative); average Mn 800-10,000 available by viscosity grade |
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Storage |
Preserve in a well-closed container and keep in cool, dry place, avoid light. |
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Package |
In fluoride bottle / plastic drums / iron drums |
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Shipment method |
By Sea, Air, Courier door to door, etc. |
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Loading Port |
China any port, Beijing, Shanghai, Hong Kong etc. |
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Application |
1,Epoxy Resin Modification Toughening of Epoxy Systems Internal Stress Reduction in Casting Resins Impact and Thermal Shock Resistance Improvement Adhesion Promotion in Composite Materials 2,Coatings & Adhesives Leveling and Slip Additives for Coatings Scratch-Resistant and Weather-Resistant Finishes Flexible Adhesive and Sealant Formulations Surface Treatment and Coupling Agents 3,Electronics & Textiles LED Encapsulation and Potting Compounds Insulating Materials for Electronic Devices Softening and Finishing Agents for Textiles Reactive Intermediates for Specialty Polymer Synthesis |
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Contact |
Contact person: Mr.Forrest Lee / Email: forrest.lee@dakenchem.com |
Q1. What is CAS 102782-97-8?
CAS 102782-97-8 is a reactive epoxy-functional polydimethylsiloxane (PDMS) with epoxypropoxypropyl (glycidoxypropyl) groups terminated at both ends of the siloxane chain. The combination of a flexible silicone backbone and terminal epoxide groups provides excellent reactivity, adhesion, and compatibility with organic resin systems.
Q2. What are the main applications of this product?
It is primarily used as an epoxy resin modifier, a functional additive for coatings and adhesives, an electronic encapsulation and potting material, and a textile finishing agent, as well as a reactive intermediate in specialty organosilicon synthesis.
Q3. Can it be used as an epoxy resin modifier?
Yes. Its terminal epoxy groups participate in the same curing chemistry as epoxy resins, allowing the flexible siloxane backbone to be covalently incorporated into the cured network. This improves toughness, reduces internal stress, and enhances thermal shock resistance of epoxy systems.
Q4. Why is it valuable for coatings and adhesives applications?
The siloxane backbone imparts low surface energy, flexibility, weather resistance, and moisture resistance, while the reactive epoxy end groups provide strong adhesion to metals, glass, plastics, and textiles. This combination makes it ideal for high-performance coating and adhesive formulations.
Q5. What purity grades are available?
Various viscosity and molecular weight grades are available, from low-viscosity grades (8-11 cSt) up to high-molecular-weight grades (average Mn ~15,000), with purity up to 99% depending on customer requirements.
Application Case 1: Epoxy Resin Toughening and Modification
Epoxy Resin Systems
CAS 102782-97-8 is used as a reactive modifier in epoxy resin formulations. Because the terminal epoxy groups take part in the crosslinking reaction, the flexible PDMS segments become chemically bonded into the cured network, increasing toughness and crack resistance without sacrificing thermal stability.
This makes it especially valuable for casting resins, adhesives, and composite matrices that must withstand mechanical stress and thermal cycling.
Benefits
Improves toughness and impact resistance of cured epoxy systems
Reduces internal stress and shrinkage during curing
Enhances thermal shock resistance and low-temperature flexibility
Compatible with standard epoxy resins and curing agents
Application Case 2: High-Performance Coatings Additive
Coatings and Surface Treatment
CAS 102782-97-8 serves as a functional additive in industrial and protective coatings. The epoxy end groups react into the coating network while the silicone backbone migrates to the surface, delivering leveling, slip, and water repellency.
Coatings formulated with this product exhibit improved scratch resistance, weathering durability, and adhesion to difficult substrates.
Benefits
Provides leveling and slip without affecting gloss
Improves scratch, mar, and chemical resistance
Enhances weatherability and moisture barrier performance
Strong adhesion to metals, glass, and plastics
Application Case 3: Flexible Adhesives and Sealants
Adhesive and Sealant Formulation
In adhesive and sealant systems, CAS 102782-97-8 acts as a reactive flexibilizer. Its terminal epoxy groups crosslink into the adhesive matrix, while the silicone backbone lowers the glass transition temperature and improves peel and shear performance.
The result is durable bonding on low-surface-energy substrates combined with long-term resistance to moisture and temperature changes.
Benefits
Increases flexibility and peel strength of cured adhesives
Improves adhesion to low-surface-energy materials
Enhances moisture, chemical, and UV resistance
Reduces internal stress in thick bond lines
Application Case 4: Electronic Encapsulation and Potting
Electronics and Electrical Materials
CAS 102782-97-8 is used in encapsulation and potting compounds for electronic components. Its low internal stress, good dielectric properties, and moisture resistance protect sensitive devices from mechanical and environmental damage.
The reactive epoxy functionality ensures the silicone component is firmly locked into the cured matrix, providing long-term reliability for LED, sensor, and module packaging.
Benefits
Lowers internal stress on delicate electronic components
Provides excellent electrical insulation properties
Offers moisture and corrosion protection
Suitable for LED, sensor, and module encapsulation
Application Case 5: Textile Finishing and Softening
Textile and Fiber Treatment
CAS 102782-97-8 is applied as a reactive textile finishing agent. The epoxy groups enable durable fixation onto fiber surfaces, imparting softness, smoothness, and water repellency that withstand repeated washing.
Compared with non-reactive silicone softeners, its chemically bonded structure delivers longer-lasting performance on cotton, synthetic, and blended fabrics.
Benefits
Imparts durable softness and smooth hand feel
Provides wash-resistant water repellency
Improves wrinkle recovery of fabrics
Reactive fixation mechanism for lasting finish
