Piezo- and ferroelectric properties

Gomes J, Nunes JS, Sencadas V, Lanceros-Mendez S. Influence of the P-phase content and degree of crystallinity on the piezo-and ferroelectric properties of poly (vinyhdene fluoride). Smart Mater Struct 2010 19(6) 065010. 

According to Zhong et al. [91], in the homopolymer form of PVDF, the chain confirmation of PVDF is fairly adaptable and crystal polymorphism is often observed with at least four polymorphic phases (a) the non-polar (or paraelectric) TGTG a phase (or form II), (b) polar aU tram p phase (or form I), (c) polar TTTGTITG y phase (or form III), and (d) polar TGTG 5 phase (or form 11 [142,143]. Among these modifications of PVDF, the ferroelectric phases (p, 5, and y) are responsible for the piezo- and ferroelectric properties. That is why numerous research efforts have been devoted to the formation pathways of ferroelecbic PVDF phases. 

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See also in sourсe #XX -- [ , ]

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