Mechanical relaxations of poly(vinylidene fluoride) and some of its copolymers

Abstract

synopsisThe dynamic mechanical properties of poly(viny1idene fluoride) have been studied under isochronal conditions and the effect of thermal treatment examined. The results are compared with a product of different molecular weight distribution. The study also included the mechanical relaxation spectra of copolymers of vinylidene fluoride and chlorotrifluoroethylene at four compositions and four frequencies as a function of temperature. The thermodynamic parameters associated with the main relaxations were determined and the results discussed on the basis of available information on the drgree of crystallinity, copolymer heterogeneity, and main chain flexibility.

(Co)polymers of Chlorotrifluoroethylene: Synthesis, Properties, and Applications

“…In contrast, poly(CTFE- co -VDF) copolymers that contain only a small amount of VDF are semicrystalline with a hexagonal structure . Those containing 25–70 mol % VDF are amorphous.…”

“…This was first investigated by Mandelkern et al 363 In contrast, poly(CTFE-co-VDF) copolymers that contain only a small amount of VDF are semicrystalline with a hexagonal structure. 364 Those containing 25−70 mol % VDF are amorphous. Although it has also been recently noted 365 that poly(CTFE-co-VDF) copolymers with more than 16.6 mol % of CTFE units also display an amorphous state (Figure 9).…”

From Vinylidene Fluoride (VDF) to the Applications of VDF-Containing Polymers and Copolymers: Recent Developments and Future Trends

“…On the other hand, poly(VDF-co-CTFE) copolymers with small VDF content is a semicrystalline copolymer with a hexagonal structure 118 , while that containing 25-70 mol. % VDF is amorphous though it has also been more recently noted 119 that poly(VDF-co-CTFE) copolymers containing more than 16.6 mol.…”

Piezoelectric Materials for Energy Harvesting and Sensing Applications: Roadmap for Future Smart Materials

“…P(VDF‐CTFE) copolymer with little amounts of VDF is semi‐crystalline, while those containing 25–70 mol% VDF are amorphous. [ 232 ] At higher VDF amounts of greater than 70% thermoplastic copolymers are obtained, known as flexible PVDF. [ 233 ] This copolymer exhibits a higher strain response than PVDF but requires a higher electric field.…”