1998 年 67 巻 1 号 p. 23-26
Thermal and structural properties of vinylidene fluoride (VDF)-trifluoroethylene (TrFE) copolymers with VDF molar contents between 57 and 77, mol% are examinend by differential scanning calorimetry, X-ray analysis, IR and 19F NMR. It is found from the experimental results that VDF sequences with three or more monomers play an important role in the phase transition and/or phase appearance. Computer simulation for the copolymerization suggests that the copolymer chain of 65--70% VDF contains ca. 50% VDF which is included in the long VDF sequences with three or more monomers. This fraction (50%) is the site-percolation thresh-old for the two-dimensional triangular lattice; transformation from the continuous structural change to the first-order phase transition with the increasing VDF fraction is understood as the percolative phase transition in the two-dimensional crystal system.
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