INFLUENCE OF COMPOSITION ON DEFORMATION BEHAVIOR OF BLEND OF POLY(ETHER ETHER KETONE) AND POLY(ETHER IMIDE)

摘要

Uniaxial deformation behavior of varying composition of binary blend of PEEK and PEI was investigated at temperatures T_g< T_p < T_(cc) and the effect of composition, temperature, stretching rate and development of crystalliniry were studied. The compositions studied were PEEK/PEI 100/0, 90/10, 80/20, 72.5/27.5, 65/35 and 50/50 resp. Increasing the PEI content shifts the T_g and cold crystallization temperature of the blend to higher temperature, however, this rule of increase of T_(cc) is faster than that of T_g. As a result the process temperature window (T_(cc)-T_g) widens. PEI retards the crystallization process of PEEK allowing the blend to be stretched at higher stretch ratio's at lower stresses at the relative processing temperature of T_g+10/20.