SynopsisThe polymer chain conformation of crystalline poly(viny1idene chloride) (PVDC) has heen the subject of controversy for the past three decades. In this study, a combination of techniques has been employed in an attempt to elucidate the preferred conformation of PVDC. Conformational models containing two monomers per translational repeat distance have heen considered. Calculations of the translational repeat distance and the nonhonded CI-CI contact distance between two adjacent CC12 groups have been performed for each of the models. By comparing these results with those derived from x-ray analysis and a theoretical estimation of the minimum nonbonded CI-Cl contact distance, an initial judgment of the structural feasibility of the models has been gained. A symmetry analysis has been performed for each conformational model and theoretical estimations of the polarization and intensity of the C-CI and C-H stretching vibrations have been obtained.These results have been compared with experimental infrared and Raman spectra. It is concluded that a T X T X ' (where X and X' are torsional angles of equal value hut opposite sign) chain-conformational model for PVDC is favored.

CCDC no.: 1515172The asymmetric unit of the title crystal structure is shown in the figure. Tables 1 and 2 contain details on crystal structure and measurement conditions and a list of the atoms including atomic coordinates and displacement parameters.

No abstract

No abstract

No abstract