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Polarization reversal switching transients of nylon 11 were measured for samples annealed in various conditions. The relation between the ferroelectric properties and hydrogen bonds between main chains is discussed. Polarization reversal of nylon 11 begins by breaking of the hydrogen bonds and ends by linking of them. However, the reason why the spontaneous polarization is difficult to be reversed in well annealed samples of nylon 11 is not because hydrogen bonds are strengthened due to annealing but because packing of molecular chains becomes denser due to annealing.
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Ikeda et al. (1995) studied this question.
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