Amorphous phase evolution during crystallization of poly(ethylene-terephthalate)

Vigier, G.; Tatibouët, J.; Benatmane, A.; Vassoille, R.

doi:10.1007/bf01095058

Cited by 34 publications

(37 citation statements)

References 10 publications

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“…v,,=c- (7) Eq. (7) shows that, if 1 were constant, V,, would be directly proportional to the crystalline volume, which would seem reasonable; however, in our case, the results are not very good with the A parameter kept constant.…”

Section: Resultsmentioning

confidence: 99%

“…The morphology was analyzed from small angle X-ray scattering (SAXS) experiments, which were carried out in point collimation using a previously described apparatus [7]. The analysis of the results was achieved using the autocorrelation function following Vonk's method [8,9] and the interface distribution function which was proposed by Ruland [lo] and improved by Fiedel …”

Section: Introductionmentioning

confidence: 99%

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Effects of the crystallinity on the β relaxation of poly(ethylene terephthalate)

Fulchiron¹,

Gauthier²,

Vigier³

1993

Acta Polymerica

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The p relaxation of PET is studied as a function of its crystallinity. The variation of the magnitude of tan @ is explained taking into account the mechanical coupling of crystalline and amorphous phases by means of a series-parallel model which is intermediate between the purely parallel and series ones. The adjustable parameter which is considered in such a model is related to the amorphous volume fraction which ensures the mechanical coupling and which appears to be proportional to the reciprocal long period. The morphology analysis shows that the variation of the crystalline fraction (between 0.32 and 0.53) during treatments carried out for one hour between 120 "C and 230 "C affects mainly the crystalline lamellae thickness while the long period evolves much less.Therefore, the coupling fraction remains almost unchanged. Moreover, an important feature ofthis work is that the p relaxation in semicrystalline polymers does not linearlyevolves with the crystallinity while p relaxation does not exist in the crystalline part.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of the crystallinity on the β relaxation of poly(ethylene terephthalate)

Fulchiron¹,

Gauthier²,

Vigier³

1993

Acta Polymerica

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“…(3). In such a completely crystallized semicrystalline sample as described above, only intraspherulitic amorphous regions exist between the lamellae, and no interspherulitic amorphous regions [16,17]. This means that we can observe the glass transition within the mobile amorphous regions (&m) between the lamellae [12], the thickness of which can be determined via Eq.…”

Section: Determination Of Amorphous Layer Thicknessmentioning

confidence: 96%

Dielectric spectroscopy and calorimetry in the glass transition region of semi-crystalline poly(ethylene terephthalate)

Dobbertin

Hensel

Schick

1996

Journal of Thermal Analysis

120

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Confinement of the glass-forming regions in the nanometer range influences the (x-relaxation which is associated with the glass transition. These effects were investigated for semicrystalline poly(ethylene terephthalate) by dielectric spectroscopy and differential scanning calorimetry. The. results are discussed within the concept of cooperative length, i.e. the characteristic length of the cooperative process of glass transition. Both experiments showed a dependence of the glass transition on the mean thickness of the amorphous layers. For the dielectric relaxation, the loss maximum was found to shift to higher temperatures with decreasing thickness of the amorphous layers, but no differences were observed in the curve shape for the differently crystallized samples. For the calorimetric measurements, in contrast, there was no correlation for the glass transition temperature, whereas the curve shape did correlate with the layer thickness of the mobile amorphous fraction. From the structure parameters, a characteristic length of approximately (2.5+1) nm was estimated for the unconfined glass relaxation (transition).

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“…Above these primary modes, the upper modes, $ \alpha_{u}^{\rm PA6} $ and $ \alpha_{u}^{\rm PET} $ , are fitted by an Arrhenius law which have been already observed 19, 20. The upper mode was also studied in the PET by mechanical means24 and dielectric techniques,25 where its real nature is often discussed. Up to now, we still do not know the origin of this mode, but its dielectric manifestation can be related directly (dipolar) or indirectly (ionic) to a motion of macromolecular chains 25.…”

Section: Resultsmentioning

confidence: 97%

Multilayer films ageing under ultraviolet radiations: Complementary study by dielectric spectroscopy

Lewandowski¹,

Rejsek-Riba²,

Bernès³

et al. 2013

J of Applied Polymer Sci

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The effect of ultraviolet (UV) irradiation on a multilayer film made of poly(ethylene terephthalate)/Polyamide 6/poly(ethylene terephthalate) was investigated by uniaxial tractions, UV-visible-NIR and Fourier transformed infra-red-attenuated total reflection spectroscopy, differential scanning calorimetry (DSC), and dynamic dielectric spectroscopy (DDS). The multilayer was exposed to ultraviolet radiations (filtered at 270 nm) for 7 days, in air. The complexity of the multilayer thermograms recorded by DSC and DDS has required the study of each film constituting the multilayer to assess each the contribution of each one of them. A deterioration in mechanical properties and a decrease in UV transmission for low wavelengths are observed. These evolutions seem to result to the photo-oxidation of the poly(ethylene terephthalate) film mainly localized at the exposed layer. This layer acts as a UV protection filter for the other layers. However, the DDS analyses show a plasticization effect of the primary mode in the Polyamide 6, which is evidence of photo-oxidation.

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Amorphous phase evolution during crystallization of poly(ethylene-terephthalate)

Cited by 34 publications

References 10 publications

Effects of the crystallinity on the β relaxation of poly(ethylene terephthalate)

Effects of the crystallinity on the β relaxation of poly(ethylene terephthalate)

Dielectric spectroscopy and calorimetry in the glass transition region of semi-crystalline poly(ethylene terephthalate)

Multilayer films ageing under ultraviolet radiations: Complementary study by dielectric spectroscopy

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