High dielectric constant polymers, exhibiting relaxor ferroelectric-like behaviors (i.e., slim single and double hysteresis loops), are attractive for high energy density and low loss electrical applications. Utilizing the principle of nanodomains, we have designed and developed novel relaxor ferroelectric-like polyamides (PAs or nylons) as an alternative to the high-cost and difficult-to-synthesize poly(vinylidene fluoride) (PVDF) based relaxor ferroelectric polymers. For nylon-based polymers, the mesomorphic crystalline structure is crucial for the electric field-induced ferroelectricity. First, the slim double hysteresis loop behavior can be achieved for even-numbered nylons at high temperatures. Second, the slim single hysteresis loop behavior can be achieved in PA copolymers and terpolymers at high temperatures. Pathways to achieve relaxor ferroelectric-like behaviors for nylon-based polymers are discussed and compared with those for PVDF-based polymers. The knowledge obtained from this study can inspire potential applications for nylon copolymers in advanced electrical and power applications.

Achieving relaxor ferroelectric-like behavior in nylon-based random copolymers and terpolymers

256th National Meeting (2018)

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