Enhancement of β phase crystals formation with the use of nanofillers in PVDF films and fibres

Lund, Anja; Gustafsson, Cornelia; Bertilsson, Hans; Rychwalski, Rodney

doi:10.1016/j.compscitech.2010.11.014

Cited by 130 publications

(78 citation statements)

References 24 publications

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“…Zhu et al [14] used molecular mechanics methods to study PVDF, and obtained a piezoelectric coefficient of -0.461 Å/V in β-PVDF crystals. Kim et al [15] and Lund et al [16] have shown the possibility of inducing the β-phase by adding carbon nanotubes to the PVDF matrix. Song et al [17] and Gee et al [18,19] focused on obtaining β-phase PVDF from polymer melt by ultrafast crystallization.…”

Section: Introductionmentioning

confidence: 99%

Simulation of α- and β-PVDF melting mechanisms

Erdtman

Satyanarayana

Bolton

2012

Polymer

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Molecular dynamics (MD) simulations have been used to study the melting of α-and β-poly (vinylidene fluoride) (α-and β-PVDF). It is seen that melting at the ends of the polymer chains precedes melting of the bulk crystal structure. Melting of α-PVDF initially occurs via transitions between the two gauche dihedral angles (G ↔ G') followed by transitions between trans and gauche dihedral angles (T ↔ G/G'). Melting of β-PVDF initially occurs via T → G/G' transitions and via transitions of complete β-(TTTT) to α-(TGTG') quartet. The melting point of β-PVDF is higher than that of α-PVDF, and the simulated melting points of both phases depend on the length of the polymer chains used in the simulations. Since melting starts at the chain ends, it is important to include these in the simulations, and simulations of infinitely long chains yield melting points far larger than the experimental values (at least for periodic cells of the size used in this work), especially for β-PVDF. The simulated heats of fusion are in agreement with available experimental data.

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Section: Introductionmentioning

confidence: 99%

Simulation of α- and β-PVDF melting mechanisms

Erdtman

Satyanarayana

Bolton

2012

Polymer

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“…Nanotubes favor the alpha crystalline form in polyamide 6 filled with MWCNTs, 135,[190][191][192][193] which is opposite that of nanoclays which favor the gamma form. 194,195 Nanotubes favor the beta phase of polyvinylidene fluoride for pristine tubes, 175,[196][197][198] fluorine-functionalized tubes, 199 and a coated nanotube which was coated with a styrene-chloromethyl styrene hyperbranched copolymer. 173 However, in one study, only when the films were drawn did beta phase crystallites form.…”

Section: Semicrystalline Polymersmentioning

confidence: 99%

Effects of carbon nanotubes on polymer physics

Grady

2012

J Polym Sci B Polym Phys

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A single carbon nanotube has many similarities with an individual polymer chain including the fact that the end-to-end length of both are often about the same and the diameter of the chain is about the same (for single-walled nanotubes) or only $10 to 20 times larger (for multiwalled nanotubes). The combination of the solid surface and the similarity of the two materials means that polymer physics are altered in manners not seen with any other type of commonly used filler. The purpose of this review is to update a chapter that appears in a recent tome by Grady (2011) and describe how polymer physics is altered in composites that contain carbon nanotubes. Subjects that will be discussed include chain configuration, glass transition, polymer diffusion, unit cells and crystalline superstructure (lamellae, spherulites and shishkebabs), and crystallization kinetics. V C 2012 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 50: 2012

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“…BaTiO 3 [7] or carbon nanotubes [8], and the d 33 of PVDF doubled upon addition of small quantities of carbon fullerenes and single-walled carbon nanotubes [9]. When the filler is a ferroelectric ceramic, interesting opportunities open up for the fabrication of composites with tuned pyroelectric and piezoelectric properties [10][11][12].…”

Section: Introductionmentioning

confidence: 99%