To a 100 mL round-bottom flask, equipped with a magnetic stir
bar and a nitrogen inlet and outlet, were added primary amineterminated
PIB and either carboxylic acid-terminated PA-11 or
PA-6. Specific recipes are shown below in Table 3. The flask was
purged with nitrogen for 15 min, and then immersed into a preheated
oil bath at 220 C for 5 h, with stirring of the contents under
nitrogen. Products were transparent and viscous in the molten
state. Upon cooling, products solidified into tough light-yellow or
off-white solids. Each block copolymer was then formed into a
compression-molded sheet (approximately 0.5 mm thickness) using
a Carver press. Conditions for compression molding were:
z20 C above the melting point of the PA block, z20 kN, 5 min.