Physical and mechanical properties of silicone

🕙 2023-09-01 👆

General rubber is a carbon-carbon bond based chain structure, and silicone rubber is a silicon-oxygen bond based chain structure,

due to the particularity of its structure, determines that it has high temperature resistance, low temperature resistance, ozone aging

resistance and excellent dielectric properties, oil and other media table

It has excellent chemical inertness and other properties that rubber does not have, so it is widely used in the defense industry such

as the aviation industry and military equipment. In particular, the fluorine silicone rubber developed in the past ten years is based on

the excellent properties of silicone rubber

On the other hand, it also has the characteristics of oil resistance, solvent resistance and chemical resistance, so that the application

of silicone rubber is expanded to a variety of oil media, acid media, chemical solvent media environment, and continues to expand its

application range. The following is a brief description of G148 silicon selected for a certain type of machine in China

The structural properties of rubber and G-51 fluorosilicone rubber and the advantages compared with similar rubber materials, silicone

rubber structure and characteristics. Intelligent silicone products

Silica gel refers to a class of linear polymers with Si-O units as the main chain and univalent organic groups as the side group. The product

has the following characteristics: the physical and mechanical properties are less dependent on temperature, due to the strong ionic property

of Si-O bond and the siloxane chain is easy to rotate and rotate

It is flexible, resulting in the tendency of siloxanes to curl. At normal temperature, the polymerization chain presents a helical structure,

and each circle is mainly composed of six or seven silico-oxygen units, and has a certain order, when the temperature rises, the helical

polymerization chain can stretch, making the polysiloxane sticky

The degree tends to increase, which is exactly the opposite of the trend that the viscosity of polymers usually decreases with the increase

of temperature, resulting in smaller physical properties of silica gel.

Due to the influence of vinyl content and molecular chain length in raw rubber, the physical and mechanical properties of silicone rubber

first increase and then decrease as the relative molecular mass of raw rubber increases and the relative molecular mass distribution widens.

When the relative molecular mass of raw rubber is 420,000, the relative molecular mass of silicone rubber is minute

When the cloth is 1.64, the silicone rubber has the highest tensile strength and tear strength.

There were significant differences in hardness (P = 0.0082), but no significant differences in tear strength, elongation at break, permanent

deformation and tear strength before and after aging (P > 0.05). Conclusion: SY-1 silicone rubber has excellent physical and mechanical

properties

It has good resistance to ozone aging.