| 초록 |
Crystalline structures of poly(vinylidene fluoride)-silica (PVDF/SiO2) hybrid composites and PVDF/SiO2/PMMA hybrid composites films were studied. These films were prepared via sol-gel process. Variation in the degree of crystallinity PVDF/SiO2 hybrid composites films were investigated as a function of silica content. Solid state magic angle spinning (MAS) NMR spectra have been investigated for a semicrystalline fluoropolymer. Solid-state 19F MAS NMR spectra of PVDF film, PVDF/PMMA blend and PVDF/PMMA/SiO2 hybrid composites films were shown ; seven resonances attributed to amorphous domain (-88ppm), crystalline domains (-101.3, –93.7, -84.2, and –79.6 ppm) and regio-irregular structures (-112.4 and –110.4 ppm). Solid-state spin-lock experiments showed significant differences in T1ρF between crystalline and amorphous domains. |
