4. Poly(N-isopropylacrylamide) (PNIPAM) has a 6-temperature in water of 0 30 °C, and a Kuhn length b= 1.1 nm. (i) Calcul

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4 Poly N Isopropylacrylamide Pnipam Has A 6 Temperature In Water Of 0 30 C And A Kuhn Length B 1 1 Nm I Calcul 1 (47.85 KiB) Viewed 43 times

4. Poly(N-isopropylacrylamide) (PNIPAM) has a 6-temperature in water of 0 30 °C, and a Kuhn length b= 1.1 nm. (i) Calculate the size of a polymer chain with a molecular weight Mn = 18,000 g/mol at the 6-temperature. The NIPAM monomer has a molar mass of 113 g/mol. (i) PNIPAM undergoes a "coil-to-globule" transition as it is heated in water, in which the polymer chain collapses into a globular structure due to interactions between itself and water. This occurs above 0. Calcu- late the size of the polymer chain at a temperature T = 40 °C. (iii) In ethanol, which has a freezing point near T = -114 °C and a boiling point of T = 78 °C, PNIPAM dissolves well at all temperatures. Its 0-temperature is below the freezing point of ethanol. Is ethanol a good, poor, or 6-solvent for PNIPAM? Using Flory theory, estimate the scaling of (R2) with respect to N.