(C ) The crystal structure of SYCP3Core is shown with a 90° rotation around its longitudinal axis; chains A-D are depicted in purple, salmon, teal and blue.
Neighbouring chains packed along the diagonals of the projection cell are shifted relative to each other in the direction of the c-axis (chain axis) by 2.0 Å.
The crystallite thickness is very small, ca 2 nm, which is close to the c-axis (chain axis) of unit cell in PTT crystal, 18.64 Å.
For the PVDF/PHB=4/6 7/3 blends, the crystal a-axis of PHB is highly oriented parallel to the drawing direction and the crystal c-axis (molecular chain axis) in PHB crystals is perpendicular to the drawing direction, i.e. orthogonal to the chain axis of the crystals of PVDF.
The in-plane hydrogen bonds from N(1 H4 + cations that form the a-axis chains are significantly shorter (mean = 1.748 Å) than the other in- and out-of-plane hydrogen bonds (mean = 1.809 Å).
The starting structures of the opened and the closed complexes C1 and C3 (1fdtB-NADPH-E1), respresented, presenthe the loop axis (main chain) in similar starting conformation (cluster cl2), but with the side chains of the loop residues oriented opposite.
Interestingly, plots of interlayer (lamellar) spacing or unit cell long axis versus chain length were linear; however, there was an abrupt discontinuity between ZnC8 and ZnC9 as a result of changes in their molecular packing [31].
The 2D GIWAXD results showed that for films thicker than 200 nm, the "c" axis (main chain direction) and "b" axis of crystal unit cell are almost parallel to the sample surface, whereas for thin films the "c" axis is preferentially perpendicular to the film plane in the crystalline phase of isothermally crystallized PTN films.
The close packing is obtained along the direction of the b axis with chains having opposite chirality.
XRD patterns suggested the nearly perfect alignment of the c-axis (polymer chain direction) along the extrusion direction in the optimized as-extruded films.
