| 초록 |
An additive, 1,4-butadiene sulfone (BDS) which generates H2SO3 by in situ thermal decomposition is used for preparing high β-phase PVDF films. Because of multiple non-covalent interactions preferential in all-trans configuration of PVDF, β-phase PVDF is spontaneously induced without mechanical drawing and/or extensive thermal annealing process. PVDF films casted from PVDF/BDS/water solutions exhibit high β-phase content (fβ = 95%) when the BDS concentration is only cBDS = 1.0 wt%, which is confirmed by POM, SEM, FT-IR, DSC and 2D GIWAXS. Because of high β-phase content, PVDF films prepared by using BDS exhibit excellent ferroelectric and piezoelectric properties (Ec = 97 MV/m, Pr = 10.9 μC/cm2 and d33 = ~‒25 pm/V). |
