Linear structure: the general structure of unvulcanized […]
Linear structure: the general structure of unvulcanized Rubber gasket. Due to the large molecular weight, it has a thin mass after no external force. When the external force acts, the exclusion force is removed, the entanglement degree of the thin group changes, the molecular chain rebounds, and a strong tendency to recover is generated, which is the origin of the high elasticity of the rubber.
Branched structure: aggregation of branches of rubber macromolecular chains to form a gel. Gels are detrimental to the performance and processing of rubber. In the rubber mixing, various compounding agents tend to improve the gel area, forming a partial blank, which cannot form reinforcing and cross-linking, and become a weak part of the product.
Crosslinked structure: Linear molecules are connected to each other by bridging of some atoms or groups of atoms to form a three-dimensional network structure. This structure continues to increase as the vulcanization process progresses. Thus, the free mobility of the segments is reduced, the plasticity and elongation are lowered, the strength, elasticity and hardness are increased, and the compression set and the degree of swelling are lowered.