Introduction to mechanical properties of rubber

Release time：2019-12-06 11:25:27

Physical and chemical properties and mechanical properties of raw rubber, vulcanizate, rubber products and rubber additives are generally tested in accordance with ISO, ASTM, DIN, GB and Hb standards. Physical and mechanical properties: density, hardness, surface resistivity, dielectric property, tensile property, impact property, tearing property, compression property, adhesive strength, wear resistance, low temperature property, rebound property

Raw rubber performance: raw rubber is commonly known as raw rubber. Raw rubber is not 100% pure. For example, natural rubber contains non rubber hydrocarbons (about 5%), including resinous acid proteins and other substances, such as molecular weight control agent terminators and dispersants, which are added to SR as antioxidants rather than as fatigue synthesis additives. But generally speaking, the composite ratio of raw rubber and rubber can represent the inherent characteristics of rubber.

1. Molecular weight: the average molecular weight of a rubber molecule.

2. Molecular weight distribution. Rubber is actually a mixture of different molecular weight chains and different proportions. The molecular weight distribution curve can be obtained by arranging different molecular weights according to the frequency of occurrence.

3. Gel content. This usually only happens on Sr. When the polymerization process is controlled by different structures, too many branched structures will be formed. As a result, some gels and solvents are insoluble, so they are called gels. It is difficult for additives to enter the rubber mixture, which affects the performance of rubber.