A rubber band, made of a styrene-butadiene random copolymer, is swollen to equilibrium in toluene,; the volume increases by a fator of 5. Taking χ= 0.4, estimate the number of strands per unit volume, and therefore the extent of cross-liking. Estimate Young`s modulus for both the dry and swollen rubber bands, .. Please give me a answer.. Thx
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