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Determine the number of cross-linking chains per unit volume N, and segment molecular weight M4 between cross links for a nubber with an initial E=2.0

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Determine the number of cross-linking chains per unit volume N, and segment molecular weight M4 between cross links for a nubber with an initial E=2.0 MPa at 20C, and the density is 1.1g/cm2

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