Crystallization behaviors and related dielectric properties of semicrystalline matrix in polymer-ceramic nanocomposites. (1st November 2021)

• Record Type: Journal Article
• Authors: Lu, Xu; Deng, Wei; Wei, Jindong; Wan, Yuhui; Zhang, Jianjun; Zhang, Lin; Jin, Li; Cheng, Z.-Y.
• Is Part Of: Composites. Number 224(2021)
• Publication Date: 2021-11-01
• Subjects: Polymer-ceramic nanocomposite -- Semicrystalline matrix -- Crystallization behaviors -- Dielectric properties; Composite materials -- Periodicals; Materials science -- Periodicals; Composite materials; Periodicals; Electronic journals; 620.118
• DOI: 10.1016/j.compositesb.2021.109195
• Languages: English
• ISSNs: 1359-8368

Abstract

Abstract: Crystallization behaviors and related dielectric properties of semicrystalline matrix in polymer-ceramic nanocomposites have been systemically investigated by using P(VDF-TrFE) 70/30 mol.% as matrix and Ba0.5 Sr0.5 TiO3 nanoparticles as filler. It is found that due to the presence of ceramic nanofiller, there are two types of crystals formed in the matrix: one formed on the surface of the ceramic nanoparticles and the other formed in the polymer. The former favors the all-trans β phase due to the interaction between matrix chains and ceramic surface. The later has defects that result in two low-temperature phases: the well-ordered β phase and less-ordered β phase (i.e. β′ phase). The conformation defects of the β′ phase result in it a lower dielectric permittivity than β phase. The proportion of β' phase decreases with increasing ceramic content and only β phase can be observed in the nanocomposites with a ceramic content higher than 35 vol%. These results were reflected in and confirmed by the DSC analyses and the dielectric properties.