Solid-state NMR study of different types of poly(vinyl formal)

Several types of poly(vinyl formal) (PVF), copolymers of six-member formal rings and unreacted vinyl alcohol, prepared by different methods of synthes is out of atactic poly(vinyl alcohol) (PVA) were studied by NMR thermal ana lysis, and wide-angle X-ray diffraction (WAXD). While thermal analysis and WAXD provide useful information about the macroscopic properties (e.g., T-g , crystallinity, T-m), solid-state NMR does focus more on the microscopic p roperties like molecular phase separation and molecular dynamics. The PVF p olymers are composed of rigid and mobile molecular domains of which the dis tribution is mainly determined by the tacticity of the original atactic PVA polymer.