Nanoporous-crystalline films of PPO with parallel and perpendicular polymer chain orientations

Oriented nanoporous crystalline (NC) phases of poly(2,6-dimethyl-1,4-phenylene) oxide (PPO) are for the first time described. In particular, PPO films with orientations of crystalline chain axes preferentially parallel (c//) or perpendicular (c⊥) to the film plane are obtained by suitable procedures of solution casting or of solvent-induced crystallization, respectively. 2D-WAXD patterns of NC PPO films, exhibiting c// and c⊥ orientations, have...