cross-linkage
Quick Summary
In chemistry, cross-links are atoms or groups that connect parallel chains within complex molecules, such as polymers. The process of forming these connections is known as cross-linkage.12
In the context of industrial polymers, diene monomers like butadiene, isoprene, and chloroprene are polymerized. These polymers are then converted into thermosetting elastomeric network polymers through a process called cross-linking or vulcanization. A common method for this is adding sulfur to the heated polymer. Even a small number of cross-links give the polymer elastic properties, allowing it to be stretched. The cross-links prevent the molecules from sliding past each other, enabling the material to return to its original shape when tension is released.3
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rubberThe cure package…the cure package, that cause interlinking reactions to take place when the mix is “cured.” In order to minimize the risk of premature cure, they are usually added at the end of mixing. The cure package usually consists of sulfur and one or more “accelerators” (e.g., sulfenamides, thiurams, or thiazoles),…
Read More…the cure package, that cause interlinking reactions to take place when the mix is “cured.” In order to minimize the risk of premature cure, they are usually added at the end of mixing. The cure package usually consists of sulfur and one or more “accelerators” (e.g., sulfenamides, thiurams, or thiazoles),…
Read More- elastomerVulcanization
…referred to as cross-linking or interlinking, because this is the essential chemical reaction.
Read More…referred to as cross-linking or interlinking, because this is the essential chemical reaction.
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materials scienceElastomers…are typically amorphous with low cross-link density (although linear polyurethane block copolymers are an important exception). This gives them low to moderate modulus and tensile properties as well as high elasticity. For example, elastomeric devices can be extended by 100 to 1,000 percent of their initial dimensions without causing any…
Read More…are typically amorphous with low cross-link density (although linear polyurethane block copolymers are an important exception). This gives them low to moderate modulus and tensile properties as well as high elasticity. For example, elastomeric devices can be extended by 100 to 1,000 percent of their initial dimensions without causing any…
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agingCross-linking theory…due to the formation of cross-links between or within the molecules of collagen (a fibrous protein) that give elasticity to these tissues. The “cross-linking” theory of aging assumes that similar cross-links form in other biologically important molecules, such as enzymes. These cross-links could alter the structure and shape of the…
Read More…due to the formation of cross-links between or within the molecules of collagen (a fibrous protein) that give elasticity to these tissues. The “cross-linking” theory of aging assumes that similar cross-links form in other biologically important molecules, such as enzymes. These cross-links could alter the structure and shape of the…
Read More- agingChanges in structural tissues
…increasing age, the number of cross-linkages within and between collagen molecules increases, leading to crystallinity and rigidity, which are reflected in a general body stiffness. There is also a decrease in the relative amount of a mucopolysaccharide (i.e., the combination of a protein and a carbohydrate) ground substance; a measure…
Read More…increasing age, the number of cross-linkages within and between collagen molecules increases, leading to crystallinity and rigidity, which are reflected in a general body stiffness. There is also a decrease in the relative amount of a mucopolysaccharide (i.e., the combination of a protein and a carbohydrate) ground substance; a measure…
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- human agingCardiovascular system
…because of the formation of cross-links both within the molecules of collagen, a primary constituent of connective tissue, and between adjacent collagen fibres. These changes in blood vessels occur even in the absence of the deposits on the arterial wall characteristic of atherosclerosis, which interfere with blood flow through the…
Read More…because of the formation of cross-links both within the molecules of collagen, a primary constituent of connective tissue, and between adjacent collagen fibres. These changes in blood vessels occur even in the absence of the deposits on the arterial wall characteristic of atherosclerosis, which interfere with blood flow through the…
Read More - human agingRespiratory system
…indicated previously, the formation of cross-links in elastin and collagen that takes place with aging reduces the elastic properties of the lung.
Read More…indicated previously, the formation of cross-links in elastin and collagen that takes place with aging reduces the elastic properties of the lung.
Read More - human agingSkin
…fibres show an increase in cross-links, which greatly restricts the elastic properties of the collagen network.
Read More…fibres show an increase in cross-links, which greatly restricts the elastic properties of the collagen network.
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