Extended-chain crystals

Melillo, Louis; Wunderlich, Bernhard

doi:10.1007/bf01507508

Cited by 75 publications

(22 citation statements)

References 12 publications

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“…9 Suwa fluoride particles (specific surface area S Å 0.2 et al showed that, in the range from 4ЊC/min to m 2 /g) having an average size of 10 mm. (Table I).…”

Section: Resultsmentioning

confidence: 99%

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Interaction between UV radiation and filled polytetrafluoroethylene (PTFE). I. Degradation processes

Ferry

Vigier

Alexander‐Katz

et al. 1998

J. Polym. Sci. B Polym. Phys.

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“…9 Suwa fluoride particles (specific surface area S Å 0.2 et al showed that, in the range from 4ЊC/min to m 2 /g) having an average size of 10 mm. (Table I).…”

Section: Resultsmentioning

confidence: 99%

“…19 It is noteworthy lich, 9 we assume that the pile of lamellae act as that, for particular incidences, the reflectivity can a multilayer (amorphous/crystalline) system. It is well known that a multilayer might exhibit, be larger than 0.5.…”

mentioning

confidence: 99%

Interaction between UV radiation and filled polytetrafluoroethylene (PTFE). I. Degradation processes

Ferry

Vigier

Alexander‐Katz

et al. 1998

J. Polym. Sci. B Polym. Phys.

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“…26 Moreover, morphological studies on melt-crystallized PTFE have shown that its microstructure is constituted of extended chain lamellae, where very long polymer chains may still be folded at the lamellar surface. 27 Following another point of view, 20 melt-crystallized PTFE can be regarded as a chain-folded polymer whose lamellar thickness is much greater than nearly all other crystalline polymers.…”

Section: Resultsmentioning

confidence: 99%

On melt-crystallization of polytetrafluoroethylene and of random fluorinated copolymers of tetrafluoroethylene

Pucciariello

Villani

Mancusi

1999

J. Appl. Polym. Sci.

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Through differential scanning calorimetry, isothermal crystallization from the melt of polytetrafluoroethylene (PTFE) has been investigated. PTFE was regarded as one of the polymers for which crystallization is so rapid that the samples crystallize during the cooling from the melt to the selected crystallization temperature. By contrast, we now report that a stochastic behavior is observed for isothermal melt-crystallization of PTFE. In fact, on cooling very quickly the samples from the molten state to the selected crystallization temperature, crystallization during the cooling is randomly observed. Therefore, repeating the experiments until crystallization on cooling was absent, it was possible to investigate isothermal melt-crystallization of PTFE. However, crystallization is very fast; in fact, crystallization kinetics can be followed just for very low undercoolings, while as the undercooling becomes as large as about 15°C, only secondary crystallization is observed. In both cases, the data have been examined through the well-known Avrami analysis, taking into account the different physical meaning of the obtained parameters. For the first cases (actual crystallization kinetics) very low, noninteger Avrami exponents have been obtained. They have been related to the fractal dimension of the crystallites and their values to the morphological observations on PTFE. For the second cases, the typical low values of Avrami exponents of secondary crystallization are obtained. Moreover, isothermal melt-crystallization of random fluorinated copolymers of tetrafluoroethylene with either hexafluoropropylene or perfluoromethylvinylether as comonomers has been studied and compared with that of PTFE.

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“…For the melt-crystallized polymer and presence of extended-chain crystals with very thick lamellale has been observed [13,14].…”

Section: Introductionmentioning

confidence: 95%

Thermal properties at room temperature of polytetrafluoroethylene

Villani

Pucciariello

1991

Journal of Thermal Analysis

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Extended-chain crystals

Cited by 75 publications

References 12 publications

Interaction between UV radiation and filled polytetrafluoroethylene (PTFE). I. Degradation processes

Interaction between UV radiation and filled polytetrafluoroethylene (PTFE). I. Degradation processes

On melt-crystallization of polytetrafluoroethylene and of random fluorinated copolymers of tetrafluoroethylene

Thermal properties at room temperature of polytetrafluoroethylene

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