(see for example, DSu ¼ 11.6 cal K À1 mol À1 and DHu ¼ 6.41 kcal mol À1 of PET at Tm0 ¼ 280 1C; PET has four rotatable bonds in the repeating unit and forms stable interchain p/p stacking.)7 As will be discussed below, the high melting point of PHB may not be...