Crosslink Density Of Rubber

The value of crosslink density may be in the order of 10 3 to 10 5 mol cm 3 for a typical rubber material corresponding to 15 to 1500 monomer units between the crosslinks.

Crosslink density of rubber. In chemistry and biology a cross link is a bond that links one polymer chain to another. These conditions will determine the flexibility behaviors of the final rubber. At higher levels of. The degree of crosslinking is affected by temperature pressure and the time of heating time.

A measure of crosslinked points per unit volume normally expressed in mol cm 3. Crosslink density is used to measure the degree of crosslinking between rubber and sulfur. The cross link density was higher for samples without styrene because styrene is a linear chain extender and therefore does not contribute to cross linking. For sulfur crosslinked natural rubber n r my students used to determine the crosslinking density or the percentage of sulfur incorporated by dividing the number of moles of sulfur used.

The chemical interaction between sulfur and rubber is called crosslink. The elastic force of retraction elasticity is directly proportional to the crosslink density. ν 2ρ φm c where ρ density of crosslinked rubber in g cm3 φ 3 4 for tri tetra functional network junctions respectively 3. These links may take the form of covalent bonds or ionic bonds and the polymers can be either synthetic polymers or natural polymers such as proteins.

Crosslink density is defined as the number of crosslink points per unit volume. Crosslink density ν.