The endothermic "annealing peak" of poly(phenylene sulphide) and poly(ethylene terephthalate)

Bonnet, Martin; Rogausch, K. D.; Petermann, J.

doi:10.1007/s003960050418

Cited by 49 publications

(36 citation statements)

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“…10e 15 C above the melt-crystallization or annealing temperature, and is almost parallel to the line T m ¼ T c . This result is a typical characteristics of the so-called annealing peak [3,4,7,31]. Similarly, the endotherms II and III steadily increase with increasing T c , but there is an increase in the area under the endothermic II peak, and decrease of the area under the endothermic III peak.…”

Section: Multiple Melting Behavior Of Isothermally Crystallized P(hb-mentioning

confidence: 83%

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Multiple melting behavior of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) investigated by differential scanning calorimetry and infrared spectroscopy

Zhang

Sato

et al. 2007

Polymer

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Section: Multiple Melting Behavior Of Isothermally Crystallized P(hb-mentioning

confidence: 83%

“…7 shows that the T I values increase linearly with the logarithm of the crystallization time at given T c . Such logarithmic time dependence is conventionally associated with the secondary crystallization [1,3,19]. Furthermore, the magnitude of this peak area increases with time.…”

Section: Multiple Melting Behavior Of Isothermally Crystallized P(hb-mentioning

confidence: 95%

Multiple melting behavior of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) investigated by differential scanning calorimetry and infrared spectroscopy

Zhang

Sato

et al. 2007

Polymer

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“…Combining the above-mentioned results with the explanations presented in the literature, it can be concluded that the annealing peak may originate from the melting of either the subsidiary crystals as proposed by Lemstra et al 6,7 and Mohame et al 20 or the pseudo- crystalline interphase between the amorphous and crystalline phases as mentioned by Petermann et al 21,22 To get a detailed insight into these molten crystallites, the FTIR experiments were focused on the temperature range in which the annealing peak appears, e.g., 130-200°C. Parts a and b of Figure 8 illustrate the intensity changes of the 981 cm -1 crystalline band and 920 cm -1 3 1 helix band of the iPS samples crystallized at 160°C for 2 and 6 h, respectively.…”

Section: Discussionmentioning

confidence: 67%

In Situ FTIR Studies on the Cold-Crystallization Process and Multiple Melting Behavior of Isotactic Polystyrene

et al. 2003

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The structure evolution of iPS during isothermal cold-crystallization and subsequent melting processes is studied by in situ monitoring its FTIR spectra. Through following the intensity changes of the characteristic bands associated with its crystalline status and 3 1 helix conformation chains, the multiple melting behavior of iPS cold-crystallized at different temperatures has been discussed in detail. It is concluded that (i) the lowest-temperature annealing peak can be ascribed either to the relaxing of locally ordered long 3 1 helix chains in the amorphous phase or to the melting of some microcrystallites formed upon long-time annealing; (ii) the double melting behavior of iPS cold-crystallized at temperatures lower than 180°C is mainly attributed to the model of melting, recrystallization, and remelting of the iPS crystals; and (iii) for the sample cold-crystallized at a temperature of 200°C, the in situ IR experiments give strong evidence to support the existence of different kinds of crystals which show different thermodynamic stabilities.

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“…The minor endotherm always was observed 5 -10°C above T c . A similar endotherm has been observed for several other semicrystalline polymers and many workers have investigated its origin [14][15][16][17]. As a result of that several sources have been proposed.…”

Section: Resultsmentioning

confidence: 72%

Morphological basis for the complex melting behaviour of isotactic polystyrene

Al‐Hussein

Strobl

2002

E-Polymers

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Temperature-dependent small-angle X-ray scattering spectroscopy of isothermally cold crystallized isotactic polystyrene revealed considerable morphological reorganization during subsequent heating to the melt. Both the crystalline thickness and the long period increased continuously with increasing temperature before the samples finally melted. The temperature dependence of these changes correlated very well with the melting behaviour observed with differential scanning calorimetry. As the temperature increased during a heating scan, the initial lamellae that formed during isothermal crystallization showed only little reorganization until they started to melt. Then, the molten material recrystallized continuously into increasingly thicker lamellae at increasing temperature until they finally melted. As the crystallization temperature approached the final melting temperature of the recrystallized lamellae, the initial lamellae melted without further recrystallization and no morphological changes were seen in this case.

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The endothermic "annealing peak" of poly(phenylene sulphide) and poly(ethylene terephthalate)

Cited by 49 publications

References 0 publications

Multiple melting behavior of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) investigated by differential scanning calorimetry and infrared spectroscopy

Multiple melting behavior of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) investigated by differential scanning calorimetry and infrared spectroscopy

In Situ FTIR Studies on the Cold-Crystallization Process and Multiple Melting Behavior of Isotactic Polystyrene

Morphological basis for the complex melting behaviour of isotactic polystyrene

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