Basic Material Properties
Phenylvinyl silicone rubber and high-phenyl silicone rubber are both important variants of silicone rubber, exhibiting significant differences in radiation resistance:

Phenylvinyl silicone rubber: Its molecular structure contains both phenyl and vinyl groups. The vinyl group (—CH=CH₂) provides a key crosslinking point for the crosslinking reaction. This structure gives it good radiation resistance, but specific data is relatively scarce.

High-phenyl silicone rubber: The phenyl content is above 30% (usually 40-50%). By disrupting the regularity of the siloxane molecular structure, the phenyl group significantly improves the material's radiation resistance, allowing it to withstand 1×10⁸ roentgens of gamma rays.

Radiation Resistance Comparison
Performance Indicators: Phenyl Vinyl Silicone Rubber, High-Phenyl Silicone Rubber
Phenyl Content: Lower (specific data not specified), Above 30% (usually 40-50%)
Gamma-ray Resistance: Good (specific data not specified), 1×10⁸ Roentgens
Molecular Rigidity: Medium, High (high phenyl content leads to high rigidity)

Radiation Resistance Mechanism: Vinyl cross-linking structure provides some protection; Phenyl disrupts structural regularity, reducing radiation sensitivity

Temperature Effect: Temperature Range: -70℃-350℃; Temperature Range: -70℃-350℃ (short-term up to -110℃-400℃)
High-phenyl silicone rubber exhibits significantly better radiation resistance than ordinary phenyl vinyl silicone rubber, primarily due to its higher phenyl content. With increasing phenyl content, the rigidity of the silicone rubber molecular chain increases, resulting in better resistance to radiation.

Application Area Differences
High-Phenyl Silicone Rubber Applications:
Aerospace: Sealing rings and pipes for low-temperature and radiation-resistant components
Nuclear power plant equipment sealing materials
Protective materials for high-energy physics experimental equipment
High-reliability components in the electronics and electrical industry

Phenyl Vinyl Silicone Rubber Applications:
Conventional electronic and electrical sealing
Heat-resistant components in the automotive industry
Medical devices (utilizing its physiological inertness)
General industrial sealing applications

Performance Optimization Directions
High-Phenyl Silicone Rubber: Radiation resistance can be enhanced by further increasing the phenyl content (up to 50%), but it should be noted that excessively high phenyl content will reduce the material's cold resistance.

Phenyl Vinyl Silicone Rubber: Radiation resistance can be improved by adding specific radiation aging resistant agents.

Composite Material Development: Research shows that blending phenyl vinyl silicone rubber with high-phenyl silicone rubber can balance radiation resistance and other mechanical properties.

Conclusion: In terms of radiation resistance, high-phenyl silicone rubber is significantly superior to phenyl vinyl silicone rubber, mainly due to its higher phenyl content (above 30%) and the resulting molecular rigidity. For applications in extreme radiation environments, high-phenyl silicone rubber is a more suitable choice; while for conventional radiation environments, phenyl vinyl silicone rubber may be more suitable due to its comprehensive performance and cost-effectiveness. Material selection should comprehensively consider the radiation intensity, temperature requirements, and other mechanical property requirements of the specific application scenario.