Macromol. Rapid Commun. 7/2011

Preparation of fluorinated polyimides with bulky structure and their gas separation performance correlated with microstructure

“…From the XRD pattern of GSPI-T2, a shoulder diffraction peak on the high angle side (2q ¼ 16.7 ) with d-spacing of 5.31 Å is also observed. This peak could be assigned to interlocking of phenyl rings of triptycene perpendicular to polymer chain, and then pep interactions between phenyl rings [34].…”

“…However, they also found that these polyimide membranes displayed very low selectivity. The bulky triptycene-based polyimides have been investigated by many researchers [34]. Triptycene is a symmetric three-dimensional, bulky and rigid structure composed of three phenyl rings bound together by a single hinge, which can disrupt chain packing and create void spaces.…”

Triptycene poly(ether-imide)s with high solubility and optical transparency

“…Due to the presence of rigid, packing-disruptive triptycene unit, the polyimides exhibited good solubility in common organic solvents while preserving moderately high T g and good thermal stability [51,52]. The polyimide incorporating a threedimensional, rigid triptycene framework has a high internal free volume to allow fast molecular diffusion, leading to high gas permeability [53]. In addition, a facile synthesis of triptycene-based hyperbranched polyimides from a triptycene triamine has recently been reported by Cheng and coworkers [54].…”

“…Recently, some new triptycene polyimides have been developed [51][52][53]. Due to the presence of rigid, packing-disruptive triptycene unit, the polyimides exhibited good solubility in common organic solvents while preserving moderately high T g and good thermal stability [51,52].…”

Synthesis and characterization of novel organosoluble and thermally stable polyamides bearing triptycene in their backbones

“…However, the synthesis and properties of triptycene-containing polymers have only begun to attract attention since 1998 [25][26][27][28][29][30][31]. The use of triptycene moiety as a rigid and shape-persistent component is a method to introduce molecular-scale free volume into a polymer film [32,33].…”