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For the following pair of polymers, decide whether or not it is possible to determine which...

For the following pair of polymers, decide whether or not it is possible to determine which has the higher tensile modulus. If it is not possible, then click on "not possible". If it is possible, then select the one with the higher tensile modulus. A) Random styrene-butadiene copolymer with 5% of possible sites crosslinked. B) Block styrene-butadiene copolymer with 10% of possible sites crosslinked.

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Answer #1

Determination is possible. Block copolymers are more crystalline in nature than Random copolymer. Higher crystalinty leads to higher Tensile Modulus. Additionally, higher crosslinking also leads to higher Tensile Modulus.

Therefore Block Styrene Butadiene copolymer shall have higher Tensile Strength than Random Styrene Butadiene as Block Styrene Butadiene is more crystalline & is also having higher number of cross linking.

Therefore, Block Styrene Butadiene has higher tensile strength.

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