Description

Siloxanes And Silicones, Di-Me, Polymers With Ph Silsesquioxanes, Hydroxy-Terminated is a specialized organosilicon copolymer combining the properties of polydimethylsiloxane (PDMS) with phenyl silsesquioxane cages, featuring reactive hydroxy end groups. This unique hybrid structure provides enhanced thermal stability, mechanical strength, and compatibility with organic matrices compared to standard silicones. It is a critical performance additive for formulators in the coatings, electronics, and advanced materials sectors seeking to improve product durability and functionality.

Application

• High-Performance Coatings & Resins: Acts as a reactive modifier in epoxy, polyurethane, and silicone-based coatings to enhance thermal resistance, weatherability, and surface smoothness.
• Electronic Encapsulants & Underfills: Used in formulations for protecting sensitive electronic components due to its excellent dielectric properties and low stress over a wide temperature range.
• Advanced Composite Materials: Serves as a coupling agent or matrix component in fiber-reinforced composites to improve interfacial adhesion and thermal-oxidative stability.
• Specialty Adhesives & Sealants: Incorporated into formulations requiring long-term durability, flexibility, and resistance to moisture and extreme environments.
• Optical and LED Packaging: Utilized in clear, high-refractive-index encapsulants for optical devices and LED packaging where clarity and thermal management are crucial.
• Release Coatings & Mold Making: Functions as a key ingredient in high-temperature resistant release agents and precision mold-making materials.

Basic Information

Product Name	Siloxanes And Silicones, Di-Me, Polymers With Ph Silsesquioxanes, Hydroxy-Terminated
CAS No.	109961-41-3
Molecular Formula	Typically represented as a copolymer; Contact for details
Molecular Weight	Varies by grade and polymerization degree
Synonyms	Hydroxy-Terminated Polydimethylsiloxane-Phenylsilsesquioxane Copolymer; PDMS-Phenyl POSS Hybrid Polymer; Poly(dimethylsiloxane-co-phenylsilsesquioxane), hydroxy-terminated; Phenyl T8 Silsesquioxane-PDMS Copolymer; Silicone-POSS Hybrid Resin; Organosiloxane Silsesquioxane Copolymer; Reactive Silicone Hybrid Oligomer
EINECS	Contact for details

Quality Control

Our production of this advanced silicone hybrid adheres to strict quality management systems. Each batch is characterized for critical parameters including hydroxy value, viscosity, molecular weight distribution, and phenyl content to ensure consistent performance. Certificates of Analysis (COA) detailing these specifications are provided and we support compliance with relevant global regulatory frameworks.

Storage

Preserve in a tightly closed container, protected from light. This material is hygroscopic (moisture-sensitive). Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep the container tightly sealed under a dry inert atmosphere (e.g., nitrogen) to prevent moisture absorption and premature reaction of the terminal hydroxy groups.

Specification

Item	Specification
Appearance	Colorless to pale yellow viscous liquid or solid
Identification (IR)	Conforms to structure
Hydroxy Value (mg KOH/g)	As per grade
Viscosity (25°C)	As per grade
Phenyl Content (%)	As per grade
Volatile Matter (%)	≤ 2.0
Moisture (KF)	≤ 0.5%

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.