Study on the Impact of Raw Material Selection on Phenyl Silicone Quality
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Raw Material Types and Classifications of Phenyl Silicone
Phenyl silicone is a high-molecular-weight linear polysiloxane material containing phenylsiloxane or methylphenylsiloxane segments in the backbone. Phenyl silicone can be divided into the following three categories based on the phenyl content:
Low-phenyl silicone rubber: Phenyl content ranges from 5-15%. It exhibits excellent low-temperature resistance, with curing temperatures down to -115°C and maintaining flexibility at -100°C.
Medium-phenyl silicone rubber: Phenyl content ranges from 15-25%. It exhibits excellent flame retardancy and self-extinguishes in the event of a fire.
High-phenyl silicone rubber: Phenyl content exceeds 30%. It exhibits excellent radiation resistance and can withstand high-dose gamma-ray exposure.
Main raw materials include monomers such as octamethylcyclotetrasiloxane (D4), octaphenylcyclotetrasiloxane (D4^(Ph)), and tetramethyltetravinylcyclotetrasiloxane (V4).
Mechanism of the Impact of Raw Material Selection on Phenyl Silicone Properties
Effect of Phenyl Content on Properties
Performance Indicators: Low Phenyl Silicone (5-15%) Medium Phenyl Silicone (15-25%) High Phenyl Silicone (30%+)
Low-Temperature Resistance: Excellent (Maintains Elasticity at -100°C) Average Poor
High-Temperature Resistance: Average (≤150°C) Good (≤200°C) Excellent (≤300°C)
Radiation Resistance: Average Good Excellent
Flammability: Average Excellent (Self-extinguishing) Excellent
Mechanical Strength: Average Average Low
Table: Comparison of Properties of Silicones with Different Phenyl Contents
