Phenylvinyl and vinyl raw rubbers exhibit significant differences in their vulcanization characteristics, primarily due to differences in their molecular structures. The following is a detailed comparative analysis of the vulcanization characteristics of the two types of raw rubber:

Vulcanization Characteristics of Phenylvinyl Raw Rubber
The introduction of phenyl groups into the siloxane main chain of phenylvinyl raw rubber significantly improves the high and low-temperature resistance of silicone rubber. The introduction of phenyl groups increases the low-temperature resistance of silicone rubber from -55°C to -73°C, while maintaining good high-temperature resistance (long-term operation at 180°C).

The vulcanization characteristics of phenylvinyl raw rubber are as follows:
The vulcanization rate is relatively slow due to the steric hindrance effect of the phenyl group.
The vulcanization process requires higher activation energy.
The vulcanization curve has a longer plateau phase, resulting in a wider processing window.
Increasing the phenyl content further reduces the vulcanization rate.
Vulcanization Characteristics of Vinyl Raw Rubber
The vulcanization characteristics of vinyl raw rubber (such as methyl vinyl silicone rubber) exhibit different characteristics:

Relationship between vinyl content and vulcanization rate:
Vinyl content is positively correlated with the vulcanization rate.
Increasing the vinyl content significantly accelerates the vulcanization rate.
Methyl vinyl silicone rubber has higher vulcanization activity.
Influencing factors:
Insufficient vinyl content can lead to incomplete vulcanization, affecting elasticity.
The acidity of the rubber compound will delay the vulcanization process.
Excessive plasticizers and structure control agents will reduce the vulcanization rate.
Process characteristics:

The vulcanization induction period is relatively short.
The vulcanization rate is faster, resulting in high production efficiency.
The vulcanization curve rises more steeply.
Comparative Analysis of Vulcanization Rates
Characteristic Phenylvinyl Raw Rubber Vinyl Raw Rubber
Vulcanization Rate Slower Faster
Activation Energy Higher Lower
Temperature Sensitivity Less sensitive to temperature changes More sensitive to temperature changes
Processing Window Wider Narrower
Effect of Vinyl Content Increasing phenyl content reduces vulcanization rate Increased vinyl content increases the vulcanization rate.
Differences in Vulcanization Mechanism
Phenyl Vinyl Rubber:

The steric hindrance effect of the phenyl group increases the activation energy of the vulcanization reaction.
The reaction rate between the vulcanizing agent and phenyl vinyl is slower.
The cross-linking network forms more slowly.
Vinyl Rubber:

The vinyl double bond has high reactivity.
The reaction rate between the vulcanizing agent and vinyl is faster.
The cross-linking network forms quickly.
Application Suggestions
Phenyl Vinyl Rubber Application Scenarios:

Applications requiring a wide processing window
Thick products requiring high vulcanization uniformity
Applications in extreme temperature environments
Vinyl Rubber Application Scenarios:

Production environments requiring rapid vulcanization
Thin-walled products
Applications requiring high production efficiency
In practical applications, the choice of rubber should be based on a comprehensive consideration of specific product performance requirements, production process conditions, and cost factors. For special applications that require both temperature resistance and vulcanization efficiency, a blend system of phenyl vinyl and vinyl rubber can be considered.