Linear Structure: The general structure of unvulcanized rubber. Due to its large molecular weight, it is in the form of a fine group without external force. When the external force is applied and the external force is removed, the entanglement degree of the fine group changes, the molecular chain rebounds, and a strong recovery tendency occurs, which is the origin of the high elasticity of rubber.
Branched chain structure: the aggregation of the branched chains of the rubber macromolecular chain to form a gel. Gels are detrimental to rubber properties and processing. During rubber mixing, various compounding agents often improve the gel area, forming a local blank, unable to form reinforcement and cross-linking, and become a weak part of the product.
Cross-linked structure: Linear molecules are connected to each other through the bridging of some atoms or atomic groups to form a three-dimensional network structure. This structure continues to strengthen as the vulcanization process progresses. In this way, the free mobility of the segment decreases, the plasticity and elongation decrease, the strength, elasticity and hardness increase, and the compression set and swelling degree decrease.
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