Crosslink Density Of Natural Rubber
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The crosslink density of carbon black reinforced natural rubber nr was correlated with 1h chemical shift by liquid state 1h nmr spectroscopy.
Crosslink density of natural rubber. ν 2ρ φm c where ρ density of crosslinked rubber in g cm3 φ 3 4 for tri tetra functional network junctions respectively 3. Crosslink density ν. Journal of macromolecular science part b. The total crosslink density test measures the total number of chemical links between the polymer chains per unit volume of the compound.
In this paper the crosslink density of rubber is explained in details and an experimental determination is described. Crosslink density of rubber free download as pdf file pdf text file txt or read online for free. Assuming an affine movement of the polymer chains and using equation 8 crosslink density values by dq nmr are in the range of 3 3 9 10 4 mol g. A measure of crosslinked points per unit volume normally expressed in mol cm 3.
Therefore oscillating disk or moving die rheometry are popular techniques in the kinetics of rubber vulcanization bateman et al 1963. Influence of carbon black on crosslink density of natural rubber. This crosslink density strongly determines the com pound s physical properties. An increase or decrease of crosslink density around the optimal crosslink density of 2 10 4 mol g caused the crosslink distribution to broaden.
Instead of observing the rubber directly with the. Natural rubber nr vulcanizates with different crosslink densities were obtained through using different sulfur and accelerator amounts and different accelerator types. In industrial menufacturing control the crosslink density of rubber determine the quality of the final rubber products. A typical rheometer chart of the accelerated sulphur vulcanization process is illustrated in fig.
For instance rubber with no crosslinking is used as the base for chewing gum. Crosslink density is an important structural parameter for cured rubber. Abstract the crosslink density is an important property affecting the major characteristics of cured rubber. Either too soft or too hard in the rubber the product will not meet the requiremets in different application.
Cross link density is proportional to the stiffness of the rubber.
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