On the morphology of poly(vinylidene fluoride) crystals in blends

Braun, D.; Jacobs, Martin I.; Hellmann, G. P.

doi:10.1016/0032-3861(94)90866-4

Cited by 48 publications

(26 citation statements)

References 47 publications

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“…As for PFA, partial crystallization leads to pronounced spherulite formation. However, the spherulites of PVDF appear to be significantly smaller than the ones in PFA and also exhibit a pronounced internal dendritic substructure which was also observed in other investigations [7]. Figures 5 and 6 are photomicrographs of a surface of a PTFE-beaker at × 500 and × 8000.…”

Section: Resultssupporting

confidence: 56%

Surface characterization of fluorinated polymers (PTFE, PVDF, PFA) for use in ultratrace analysis

Ortner

Dahmen

et al. 1996

Analytical and Bioanalytical Chemistry

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Surface characterization of new unused PTFE, PFA and PVDF labware has been carried out by light microscopy, scanning electron microscopy, profilometry and atomic force microscopy. It has been found that in spite of higher micro-roughness, PFA exhibits the lowest nano-roughness and hence seems best suited as vessel material for relatively mild pressureless chemical operations for sample preparation of ultrapure substances, as container material for storage of ultrapure liquids, and for transport of such liquids, e.g., from the producer in the chemical to the end user in the microelectronics industry. This suitability refers only to the surface quality of the investigated materials. PTFE-surfaces, due to the sintering process of production, exhibit the most unfavourable surface quality of the investigated fluorinated polymers.

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Section: Resultssupporting

confidence: 56%

Surface characterization of fluorinated polymers (PTFE, PVDF, PFA) for use in ultratrace analysis

Ortner

Dahmen

et al. 1996

Analytical and Bioanalytical Chemistry

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“…1 Immediately following that preparation step, the sample was quenched further to T c (2) ϭ 141°C. At that temperature, a large number of additional "quench spherulites" developed from athermal nuclei.…”

Section: Methodsmentioning

confidence: 99%

“…These particular conditions result in a large variety of supermolecular structures. [1][2][3][4][5][6][7][8][9][10] The actual morphology depends decidingly on the rates ratio between that diffusional displacement (v D ) and crystallization (v c ). This ratio, in turn, can be controlled by suitable choice of the crystallization temperature T c : the diffusion rate increases evenly with temperature, whereas the crystallization rate, particularly the spherulite growth rate, exhibits a maximum anywhere between the glass transition temperature T g and the equilibrium melting temperature T m 0 , and is zero outside this temperature range (Fig.…”

Section: Introductionmentioning

confidence: 99%

Crystallization-induced composition inhomogeneities in PVDF/PMMA blends

Kalivianakis¹,

Jungnickel²

1998

J. Polym. Sci. B Polym. Phys.

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“…80,85 In some cases, the composition changes at the crystallization site may cause a turn over of crystal modification and such of spherulite habit. 70,75 They may also cause a change of T g of the rest melt, which in its turn influences the crystallization kinetics and resulting morphology, too. 58,59,62,68,82 The composition changes may finally unveil themselves by nonlinear growth of the spherulites.…”

Section: Htc/ncc Systems: Crystallization Induced Composition Changesmentioning

confidence: 99%

Crystallization kinetical and morphological peculiarities in binary crystalline/crystalline polymer blends

Liu

Jungnickel

2007

J Polym Sci B Polym Phys

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A survey is presented on the crystallization kinetics and the morphology of miscible crystalline/crystalline polymer blends. There are only few corresponding systems. In them, however, a number of strange kinetic and structural phenomena can be observed: (i) spherulitic crystallization of the components side‐by‐side, (ii) “interpenetrating crystallization,” (iii) “interlocking spherulitic crystallization,” and (iv) “interfilling crystallization.” Cocrystallization is forbidden for crystallographic reasons. The blend partners grow instead in their own lamellar stacks, and mixed lamellar stacks are a seldom and questionable exception. They crystallize also usually stepwise and not simultaneously. Upon step crystallization, the crystallization of the second component is determined by its redistribution with crystallization of the former. Those composition inhomogeneities are an independent issue that arises also with the development of the morphology in crystalline/amorphous blends, and a corresponding survey is yielded, too. The blend poly (vinylidene fluoride)/poly‐β‐hydroxybutyrate is a convenient model system as it can show all of these morphological and kinetic features after suitable thermal treatment. Some of them are demonstrated in the present publication. © 2007 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 45: 1917–1931, 2007

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On the morphology of poly(vinylidene fluoride) crystals in blends

Cited by 48 publications

References 47 publications

Surface characterization of fluorinated polymers (PTFE, PVDF, PFA) for use in ultratrace analysis

Surface characterization of fluorinated polymers (PTFE, PVDF, PFA) for use in ultratrace analysis

Crystallization-induced composition inhomogeneities in PVDF/PMMA blends

Crystallization kinetical and morphological peculiarities in binary crystalline/crystalline polymer blends

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