A structural study of poly(p-phenylene vinylene)

Band gap engineering for poly(p‐phenylene) and poly(p‐phenylene vinylene) copolymers using the tight‐binding approach

“…In this case PM3 provides better results, as there is experimental evidence that stilbene is planar. For PPV oligomers both methods produce results in good agreement with available experimental X-ray data [25,26]. As expected, the dihedral angle is reduced from gaseous phase crystals due to packing and intrachain effects.…”

Determination of Molecular Orientational Order in Cold-Stretched Poly(p-phenylene vinylene) Thin Films by DECODER 13C NMR

“…The lateral packing of PPV polymer chains is very regular within individual PPV crystallites [14]. Electron diffraction studies have shown that PPV has a paracrystalline structure with a monoclinic unit cell [18,20,31].…”

Side-Chain Effects on Friction-Transferred Polymer Orientation

“…In the case of DOPPV, each diffraction profile of such three directions, q x , q y and q z , was observed having an obvious difference; the diffraction profile of the q x , q y and q z directions shows only a series of periodic peaks corresponding to the (00l), (h00) and (0k0) reflections, respectively. 25 In the present case, however, we found that the GIXD profiles of the q z and q y directions show almost equivalent diffractions, which might be corresponding to the (hk0) [6][7][8][9][10][11][12]25 The in-plane GIXD profiles with identical in-plane geometry strongly depended on the directions of scattering vector, q x and q y . Changes in scattered intensity at a locked q correspond to the distribution of the orientation of the diffracted lattice plane.…”

“…This finding suggests that BEHPPV might be crystallized in a different manner from that of other PPV derivatives, monoclinic system. [6][7][8][9][10][11][12]25 Shown in Figure 3 are synchrotron-sourced GIXD profiles of friction-transferred BEHPPV film obtained by directing the scattering vector along three principal directions. In the case of DOPPV, each diffraction profile of such three directions, q x , q y and q z , was observed having an obvious difference; the diffraction profile of the q x , q y and q z directions shows only a series of periodic peaks corresponding to the (00l), (h00) and (0k0) reflections, respectively.…”