Dielectric and dynamic mechanical relaxation of poly(ether ether ketone)/poly(etherimide) blends below the glass transition

Goodwin, Andy A; Marsh, R.D.L.

doi:10.1002/marc.1996.030170706

Cited by 6 publications

(6 citation statements)

References 7 publications

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“…10 show that the activation energy remains in the same range of magnitude (* 45 kJ mol -1 ) for all the thermal treatments for both polymers. Our values remain consistent with the literature for PEEK [23,54]. As there is a very similar behaviour between PEEK and PAEK LM (by DMA and DDS), the localized mobility of both polymers and their molecular origin are probably the same: oscillations of aromatic rings near polar regions interacting with water molecules.…”

Section: B Relaxationssupporting

confidence: 91%

“…Both PEEK and PAEK LM displayed the b 2 mechanical relaxation at the same temperature (-58°C) that strengthen the similarity of the two polymers. The literature identifies the b 2 relaxation as the localized mobility of aromatic rings in various PAEK polymers [21,22,54]. Quiroga et al [21] have also observed the b 2 relaxation of PEKK which is located at higher temperature than the PEEK one, probably due to a lower proportion of Ether moieties.…”

Section: B Relaxationsmentioning

confidence: 99%

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Thermal, mechanical and dielectric behaviour of poly(aryl ether ketone) with low melting temperature

Audoit

Rivière

Dandurand

et al. 2018

J Therm Anal Calorim

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New poly(aryl ether ketone)s (PAEKs) with a low melting temperature (relative to PEEK) are of interest in order to simplify the manufacturing of high-performance polymers or composites. In this study, we propose to investigate the physical properties of a new PAEK from Victrex, namely PAEK LM. Combinations of thermal analyses were used as follows: standard and modulated temperature differential scanning calorimetry, dynamic mechanical analysis, dynamic dielectric analysis and guarded hot plate technique. We found that the global mechanical, dielectric and thermal properties are very similar to the PEEK reference. The glass transition temperature was observed in the same range than PEEK (* 150°C) while the melting temperature T m was measured at 307°C for PAEK LM which is about 35°C below the melting temperature of PEEK. The degree of crystallinity of PAEK LM was found to be 27% while for PEEK it is 38%, depending on the processing conditions. This work explored crystalline structure-property relationships to explain the behaviour of PAEK LM.

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Section: B Relaxationssupporting

confidence: 91%

Section: B Relaxationsmentioning

confidence: 99%

Thermal, mechanical and dielectric behaviour of poly(aryl ether ketone) with low melting temperature

Audoit

Rivière

Dandurand

et al. 2018

J Therm Anal Calorim

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“…The fast secondary or γ-relaxation was detected in PEI and characterized by different techniques, namely by Dynamic Mechanical Thermal Analysis (DMTA), 6,18 Dielectric Relaxation Spectroscopy (DRS) 6,18,19 and TSDC. 6 It appeared in the deep amorphous solid state, more than 100 degrees below the glass transition temperature, T g .…”

Section: The Different Types Of Mobilitymentioning

confidence: 99%

Dielectric relaxation study of poly (ether imide) by thermally stimulated depolarization currents

Diogo

2021

J of Applied Polymer Sci

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This work presents a detailed study, by thermostimulated depolarization currents, of the molecular mobility of poly (ether imide) in a broad temperature range covering the amorphous solid state, the glass transition, and the rubber state. Taking advantage of the very wide distribution of motional modes of the PEI glass transition (the broadest of all known glass formers), we carried out an in-depth study of physical aging involving different modes, which provided a more comprehensive view of the aging process. We also analyzed in detail the mobility below T g where, in addition to the fast secondary relaxation, we identified a Johari-Goldstein. In the rubber state, on the other hand, we detected a mobility but showed that it corresponds to space charge motions rather to dipolar reorientations.

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“…Recently, we have explored the miscibility of PEEK/PEI blend at the molecular level through free volume studies using PALS . On the other hand, DMTA studies were focused mainly on miscibility and relaxation process in PEEK, PEI, and their blends . In spite of the prominent utility of PEEK and its blends in aerospace applications, there are no scientific reports to understand the damping behavior of this blend to the available free volume in it.…”

Section: Introductionmentioning

confidence: 99%

“…3 On the other hand, DMTA studies were focused mainly on miscibility and relaxation process in PEEK, PEI, and their blends. 6,[42][43][44] In spite of the prominent utility of PEEK and its blends in aerospace applications, 8 there are no scientific reports to understand the damping behavior of this blend to the available free volume in it. In this work, we have made an attempt to explore the free volume and damping properties in this blend using PALS and DMTA techniques.…”

Section: Introductionmentioning

confidence: 99%

Free volume and damping in a miscible high performance polymer blend: Positron annihilation lifetime and dynamic mechanical thermal analysis studies

Ramani

Alam

2015

J of Applied Polymer Sci

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High performance polymer blend of poly(ether ether ketone) (PEEK) and poly(ether imide) (PEI) was examined for their free volume behavior at different compositions of PEI using positron annihilation lifetime spectroscopy (PALS). The damping property of the blend was studied using tan‐δ obtained from dynamic mechanical thermal analysis (DMTA). The dependence of tan‐δ on temperature revealed that the blend is miscible in all compositions, in agreement with earlier studies. The tan‐δ peak height is found to increase with increase in free volume fraction for the entire blend composition signifying that the free volume plays an imperative role in understanding the damping property. Using DMTA, master curves were obtained at a reference temperature T0 by applying the time‐temperature‐superposition (TTS) using Williams‐Landel‐Ferry (WLF) relationship. From the shift factor aT, the WLF coefficients normalc10 and normalc20 were evaluated, using which the free volume fraction was found. Both PALS and DMTA methods were found to give similar results for the dependence of free volume for various PEI contents studied in this blend. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 42961.

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Dielectric and dynamic mechanical relaxation of poly(ether ether ketone)/poly(etherimide) blends below the glass transition

Cited by 6 publications

References 7 publications

Thermal, mechanical and dielectric behaviour of poly(aryl ether ketone) with low melting temperature

Thermal, mechanical and dielectric behaviour of poly(aryl ether ketone) with low melting temperature

Dielectric relaxation study of poly (ether imide) by thermally stimulated depolarization currents

Free volume and damping in a miscible high performance polymer blend: Positron annihilation lifetime and dynamic mechanical thermal analysis studies

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