| Polymer blends are generally immiscible due to the unfavorable thermodynamics of mixing. By the introduction of ion-dipole interaction, mechanical properties of the PPTA anion/polar polymers (such as PVP, PEO and PPrO) molecular composites have been investigated in relation to their miscibility and microstructural morphology. Optical clarity observed in the glassy PPTA anion/PVP system suggest the presence of miscibility, since the refractive indices between the two components are quite different, n;Molecular composites exhibit not only an enhanced tensile strength and modulus, but also a greater fracture toughness, K;Two phase systems with microphase separation are developed since many miscible polymer blends exhibit enhanced strength at the expense of toughness. The development of PMMA ionomer/PMMA blend shows a positive deviation from the rule of mixture in both strength and toughness. In addition, the synergistic behavior is confirmed by fracture toughness, K... |
