The effect of low temperature on the surface properties of phenyl vinyl silicone (often referred to as phenyl silicone rubber) is mainly reflected in the changes in its physical and mechanical properties. The following is a detailed analysis of this effect:

1. Changes in physical properties at low temperatures
Glass transition temperature (Tg):
The glass transition temperature of phenyl silicone rubber is usually low, which determines its performance at low temperatures. As the phenyl content increases, the glass transition temperature of silicone rubber may change, but in general, phenyl silicone rubber has a low Tg value, which is conducive to maintaining elasticity at low temperatures.

For example, the Tg of medium phenyl silicone rubber is about -110℃, and the Tg of low phenyl silicone rubber may also be close to this temperature range. This means that phenyl silicone rubber can still maintain good elasticity in environments below these temperatures.
Crystallinity:
The crystallinity of phenyl silicone rubber has an important influence on its low temperature performance. By introducing phenyl groups, the crystallization temperature and crystallinity of polydimethylsiloxane can be destroyed, thereby reducing the crystallinity of the vulcanized rubber. This makes phenyl silicone rubber less likely to crystallize at low temperatures, thereby maintaining its elasticity.

It is worth noting that although phenyl silicone rubber is not easy to crystallize at low temperatures, long-term use at extremely low temperatures may still cause its performance to deteriorate.

2. Changes in mechanical properties at low temperatures
Elasticity:
At low temperatures, the elasticity of phenyl silicone rubber can usually be maintained well. This is due to the combined effect of the flexibility of its molecular chain and the low glass transition temperature.
In particular, low-phenyl silicone rubber and medium-phenyl silicone rubber can still maintain the elasticity of rubber in the low temperature range of -70℃ to -100℃, which is the best low-temperature performance among all rubbers.

Compression cold resistance coefficient:
The compression cold resistance coefficient is an important indicator to measure the recovery ability of rubber after compression deformation at low temperatures. Phenyl silicone rubber usually has a high compression cold resistance coefficient at low temperatures, indicating that it can quickly recover its original shape after being compressed at low temperatures.

3. Changes in other properties
Aging resistance:
Phenyl silicone rubber not only has excellent low-temperature performance, but also has good aging resistance. When used for a long time in a low-temperature environment, its performance changes are relatively small and can maintain a long service life.

Electrical insulation performance:
The electrical insulation performance of phenyl silicone rubber is also relatively stable at low temperatures and will not decrease significantly due to temperature reduction. This makes it have a wide range of application prospects in low temperature environments where electrical insulation is required.

In summary, the effect of low temperature on the surface properties of phenyl vinyl silicone is mainly reflected in the changes in its physical and mechanical properties. Phenyl silicone rubber can maintain good elasticity and recovery ability at low temperatures, and has good aging resistance and electrical insulation properties. These excellent properties make phenyl silicone rubber have a wide range of application value in low temperature environments. However, it should be noted that long-term use at extremely low temperatures may still lead to a decrease in its performance, so in practical applications, it needs to be selected and designed according to specific conditions.