1.4. Dupont's Kevlar is a high-strength, high-modulus fiber. The chemical repeat is shown as below (Allen...

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1.4. Dupont's Kevlar is a high-strength, high-modulus fiber. The chemical repeat is shown as below (Allen Q2. 11.) Bond lengths c-C =1.54 Å H c=C=1.33 Å N-C=1.47 Å (a) Assuming Kevlar to be a rigid rod, estimate the end-to-end distance of a polymer with a molecular weight of 140,000 g/mol. (For simplicity, bond angles of -NH- and -CO within repeating unit can be assumed as 180°) (b) Below is a differential scanning calorimetry (DSC) curve of Kevlars fibers at nitrogen flow. Interpret the curve and estimate the glass transition temperature (Tg). 4 Endothermic bo0 Temp./C l00 200 400 500 Heat flow 1.4. Dupont's Kevlar is a high-strength, high-modulus fiber. The chemical repeat is shown as below (Allen Q2. 11.) Bond lengths c-C =1.54 Å H c=C=1.33 Å N-C=1.47 Å (a) Assuming Kevlar to be a rigid rod, estimate the end-to-end distance of a polymer with a molecular weight of 140,000 g/mol. (For simplicity, bond angles of -NH- and -CO within repeating unit can be assumed as 180°) (b) Below is a differential scanning calorimetry (DSC) curve of Kevlars fibers at nitrogen flow. Interpret the curve and estimate the glass transition temperature (Tg). 4 Endothermic bo0 Temp./C l00 200 400 500 Heat flow

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1 the total length of one repeating unit including 1 bond with next unit NC 3 NC 2 C... View the full answer