Crystallization of poly(aryl‐ether‐ether‐ketone): Effect of thermal history of the melt on crystallization kinetics

Deslandes, Yves; Day, M.; Sabir, Nadeem; Suprunchuk, T.

doi:10.1002/pc.750100513

Cited by 38 publications

(22 citation statements)

References 31 publications

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“…The results are consistent with results available for the PEEK semicrystalline thermoplastic matrix. 9,10,15 On the contrary, a 13% increase of the crystallinity degree, as compared to the reference material, was observed for the TT1 thermal treatment. However, as this small increase lies within the expected experimental errors, during DSC tests, the degrees of crystallinity of reference and TT1 thermal-treated material might be considered to remain unaffected by the thermal treatment.…”

Section: Degrees Of Crystallinitycontrasting

confidence: 61%

“…As expected, 14,15 thermal treatments prior to the consolidation of the laminate affect the degree of crystallinity of the C/PPS composite. An overview of the degrees of crystallinity obtained for the thermal treatments applied in the present study is given in Table II.…”

Section: Degrees Of Crystallinitymentioning

confidence: 63%

“…The results are consistent with results available for the PEEK semicrystalline thermoplastic matrix. 9,15 On the contrary, thermal treatment referred to in Figure 1 as TT1 has nearly the same level of porosity as compared to the reference material with a value of around 1%.…”

Section: Porosity Evaluationmentioning

confidence: 89%

“…On the other hand, it is well known that there is an evolution of semicrystalline thermoplastic matrices in the melt state, at temperatures that are relevant for processing them; it seems to concern all semicrystalline and high performance thermoplastic resins (e.g., PEEK, PEI, PEKK, PPS, PP, PEK, TPU, etc.). Heating of said resins at temperatures over the melting point is affecting their degree of crystallinity [9][10][11][12][13][14][15] and, hence, their mechanical properties. Mentioned effect depends on temperature, [9][10][11][12] time of holding the resin in the melt state, 9,10,12 crystallization time, 9 and cooling rate.…”

Section: Introductionmentioning

confidence: 99%

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Effect of thermal treatment on the tensile and in‐plane shear behavior of carbon fiber‐reinforced poly(phenylene sulfide) composite specimens

Pantelakis

Katsiropoulos

Lefebure³

2007

J of Applied Polymer Sci

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The effect of PPS matrix evolution occurring during thermal treatment of carbon fiber-reinforced PPS plies prior to their consolidation to laminates on the mechanical behavior of the composite material has been investigated. The thermal treatments were performed at temperatures and times, which are relevant for processing PPS composites. All thermal treatments were carried out in an oven in air to facilitate the presence of oxygen, while the subsequent consolidation was performed in an autoclave. The tensile and in-plane shear behavior of both, thermal-treated and untreated materials, was investigated. Differential scanning calorimetry and microscopy analyses were made to evaluate the effect of the performed thermal treatments on degree of crystallinity and porosity of the laminates. The mechanical tests carried out have shown an appreciable degradation of the mechanical properties investigated. The observed degradation increases with increasing thermal treatment temperature and time when thermal treatments were carried out on each single composite ply prior to the consolidation. On the other hand, when, prior to the consolidation, the whole set of plies was subjected to thermal treatment, improved mechanical properties were observed. The results were discussed under the viewpoint of PPS matrix evolution during processing of the composite plies in the presence of oxygen.

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Section: Degrees Of Crystallinitycontrasting

confidence: 61%

Section: Degrees Of Crystallinitymentioning

confidence: 63%

Section: Porosity Evaluationmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of thermal treatment on the tensile and in‐plane shear behavior of carbon fiber‐reinforced poly(phenylene sulfide) composite specimens

Pantelakis

Katsiropoulos

Lefebure³

2007

J of Applied Polymer Sci

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“…Should the crystallization kinetics of PPS be sensitive to these experimental conditions then it becomes difficult to compare the results of the various studies. Furthermore, the crystallization behavior of several thermoplastic polymers is known to be sensitive to their thermal history (14)(15)(16)(17)(18). An understanding of the effect of the melt conditions on the crystallization behavior of PPS is therefore of interest.…”

Section: Introductionmentioning

confidence: 99%

Crystallization behavior of polyphenylenesulfide

Budgell

Day

1991

Polymer Engineering & Sci

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The crystallization behavior of poly(pheny1ene sulfide) (PPS) has been examined by differential scanning calorimetry as a function of melt temperature, residence time in the melt, and the presence of a liquid crystal polymer. The results suggest that the thermal history of the sample plays an important role in determining the crystallization kinetics. Short residence times at low melt temperatures and high melt temperatures alone resulted in a low value for the Avrami exponent n. The former effect was ascribed to incomplete melting of the polymer while the latter effect was attributed to thermal degradation. Blending a liquid crystal polymer, Vectra A950, with PPS had only a minor effect on the crystallization behavior.

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Thermal stability and crystallization kinetics of poly(ether ether ketone)

Chen

Chao

1998

Macromol. Chem. Phys.

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SUMMARY Thermogravimetric analysis (TGA), dynamic rheological analysis and polarized light microscopy were used to assess the thermal stability of poly(ether ether ketone) (PEEK). Samples were exposed to temperatures in the range 385-415 "C for times up to 30 min in both air and nitrogen atmosphere. The results indicated that neither TGA nor dynamic rheological analysis detected PEEK degradation at temperatures up to 415°C and heating times up to 30 min in nitrogen. It is suspected that degradation, chain branching, and crosslinking occur in PEEK at high temperatures in the melt. In nitrogen atmosphere, the growth rates of spherulites at 290°C and 300°C leveled off for melting temperatures around 400°C and decreased with increasing melting temperature. This study suggests that when the melt of PEEK has been equilibrated at 400 "C for 15 min in nitrogen, the subsequent crystallization behavior (isothermal and nonisothermal) is nearly independent of the prior thermal history. The rates of crystallization of PEEK then were measured in the temperature range of 270-325 "C. Kinetic analysis indicated that PEEK exhibits a regime I1 + I11 transition at 296 "C.

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Crystallization of poly(aryl‐ether‐ether‐ketone): Effect of thermal history of the melt on crystallization kinetics

Cited by 38 publications

References 31 publications

Effect of thermal treatment on the tensile and in‐plane shear behavior of carbon fiber‐reinforced poly(phenylene sulfide) composite specimens

Effect of thermal treatment on the tensile and in‐plane shear behavior of carbon fiber‐reinforced poly(phenylene sulfide) composite specimens

Crystallization behavior of polyphenylenesulfide

Thermal stability and crystallization kinetics of poly(ether ether ketone)

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