Polymer paperModelling of chain twist boundaries in poly(vinylidene fluoride) as a mechanism for ferroelectric polarization
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2015, PolymerCitation Excerpt :This behavior was indicated by Kepler et al. [17] and Dvey-Aharon et al. [18] based on consideration of the fact that the orthorhombic symmetry of the PVDF unit cell is only a small (1%) distortion of a hexagonal lattice. The second kind of domain boundary, the twist boundary formed perpendicular to the length of the nanofiber, is as hypothesized by Reneker and Mazur [19]. Fig. 8 compares the twist boundary described by those authors to a typical example from the present simulated results.
Molecular scale imaging and observation of electron beam-induced changes of polyvinylidene fluoride molecules in electrospun nanofibers
2013, PolymerCitation Excerpt :Also, if a cross section of a fiber contains two or more crystals with different azimuthal orientations, different spacings would be observed in an electron micrograph image. The possibility that a fiber contained small, side by side crystals with different electrical polarization directions was described [24]. Real crystals in an electrospun PVDF nanofiber can accommodate folds, chain ends, trapped entanglements, twist, interfaces, chemical imperfections in the chain, regions with different crystal structures, and regions formed with even more complicated morphology.
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