Characterization of the
Chain-Ends and Branching Structures
in Polyvinylidene Fluoride with Multidimensional NMR
- Publication date
- Publisher
Abstract
Multidimensional solution NMR (<sup>19</sup>F, <sup>1</sup>H, and <sup>13</sup>C) has been used to determine chain-ends and
backbone branching
points and to obtain unambiguous <sup>19</sup>F and <sup>1</sup>H
resonances assignments from these chain-ends and branching structures
in poly(vinylidene fluoride) (PVDF). The multidimensional NMR methods
employed in this study not only enabled the resonance assignments
of the last monomer of the chain but also provided assignments for
the last three monomer units of chain-end structures. The chain-end
signals from PVDF were determined using spin–lattice relaxation
measurements and 2D diffusion ordered spectroscopy (DOSY) analysis.
2D-NMR analyses were also used to assign resonances of chain branching
points along the backbone of the polymer