Question

17.6 A linear homopolymer within the range 270-330 K. Following complete crystallization, the melting temperatures were measured by differential scanning calorimetry.Determine the equilibrium melting was (Tm temperature, T m* Tmy/K TJK 300.0 270 306.5 280 312.5 290 300 319.0 310 325.0 320 331.0 330 337.5 Small-angle X-ray scattering experiments using CuKg radiation gave the positions of the firs maxima shown in the table below. Using the Bragg equation calculate the values of the long period for each crystallization temperature. T./K 270 0.44 280 0.39 290 0.33 300 0.27 310 0.22 320 0.17 330 0.11 The degree of crystallinity thickness in each case and hence determine graphically the fold surface energy, Ye, if the enthalpy of fusion of the polymer per unit volume AHy is 1.5x 10* J m. was measured to be 45% for all samples. Calculate the lamellar

Answer 1

antio ytaliten tep Meln pout as a 350 2/Y t132-36 340 330 320 310 300 290 280 270 260 250 3s6 210 290 330 to be 349.6 k Ghaph TwT ies the value Using apye n 2dsing 2 suo Putting d can be calculated and ham given values