Solved] 1.4. Dupont's Kevlar is a high-strength
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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 H c C 1 33 N C 1 47 (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 H c C 1 33 N C 1 47 (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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