NMR Study of the Chain End and Branching Units in Poly(vinylidene fluoride-co-tetrafluoroethylene)

作者：Li Linlin^*; Twum Eric B; Li Xiaohong; McCord Elizabeth F; Fox Peter A; Lyons Donald F; Rinaldi Peter L

来源：Macromolecules, 2013, 46(18): 7146-7157.

DOI：10.1021/ma401313e

2D-NMR techniques were used to identify the detailed structures of chain end and branching units in poly(vinylidene fluoride-co-tetrafluoroethylene), poly(VDF-co-TFE). Atomic connectivity information was provided by selective F-19-F-19 COSY (correlation spectroscopy), F-19{H-1) gHETCOR (gradient heteronuclear correlated), and H-1{C-13} HSQC (heteronuclear single quantum correlation) experiments. Diffusion ordered spectroscopy (DOSY) and spin lattice relaxation (T-1) data permitted distinction of backbone, short chain branch, and chain end resonances from one another. Quantitative data on these structures are reported; quantitation also supported assignments through the consistent relative intensities of resonances from the same structures. Possible reactions during the polymerization which could lead to these structures are discussed.

• 出版日期2013-9-24