In the context of rubber, crosslink length refers to the distance between the crosslinks within the rubber polymer network. To understand crosslink length, it’s important to first understand what crosslinks are. Rubber is a polymer material made up of long chains of repeating units called monomers. In its raw form, rubber is soft and malleable. … Continued
“In-situ mix” and “ex-situ mix” are terms used to describe the process of mixing silicone rubber compounds. In-situ mix refers to the process of mixing the silicone rubber compound directly at the manufacturing site or application location. This involves combining the base silicone material with various additives and catalysts to form a uniform mixture, which … Continued
Non-polar plasticizers are often used in rubber applications that require low-temperature flexibility and resistance to oil, solvents, and other non-polar substances. Here are some common non-polar plasticizers used for rubber: Mineral oil – Mineral oil is a commonly used non-polar plasticizer that provides good low-temperature flexibility and excellent resistance to oils and solvents. It is … Continued
Plasticization of rubber refers to the process of adding plasticizers to natural or synthetic rubber to make it more flexible and pliable. Plasticizers are chemicals that can soften and increase the elasticity of rubber by disrupting the intermolecular forces between polymer chains. This allows the rubber to be molded, shaped, and stretched more easily, making … Continued
Examples of longer chained functional polymer surface treatments for fumed silica include: Silane coupling agents: Silane coupling agents are widely used to modify the surface of fumed silica particles. These agents typically have a longer chain length (e.g., C18) and contain functional groups such as amino, epoxy, or methacrylate. The silane coupling agent reacts with … Continued
The lubricity theory, free volume theory and the gel theory are three theories that explain the plasticization of rubber compounds. The lubricity theory suggests that plasticizers improve the lubrication between the polymer chains in the rubber compound, which allows for easier movement and greater flexibility. According to this theory, the plasticizer molecules are inserted between … Continued
What is Plasticization? Plasticization of a rubber compound refers to the process of adding plasticizers to the rubber to improve its flexibility, workability, and other properties. A plasticizer is a chemical compound that is added to a material to make it more pliable and easier to shape. In the case of rubber, plasticizers are added … Continued
The Arrhenius equation is a mathematical relationship that describes the effect of temperature on the rate of chemical reactions. It was first proposed by the Swedish chemist Svante Arrhenius in 1889. The equation is given by: where k is the rate constant of the reaction, A is the pre-exponential factor (or frequency factor), Ea is … Continued
Plasticizers are a type of additive used in rubber compounds to improve their flexibility, durability, and other physical properties. They are often added to rubber formulations to make the material softer and more pliable, while also improving its resistance to cracking, abrasion, and other forms of wear and tear. There are many different types of … Continued
The Garvey Die Extrusion test is a widely used method for evaluating the processability of rubber compounds. It involves measuring the pressure required to extrude a rubber sample through a standardized die under controlled conditions. The test is typically conducted using a Garvey die, which consists of a cylindrical cavity with a 0.3-inch diameter and … Continued
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