Étude du comportement viscoélastique du polycarbonate de bisphénol-A partiellement cristallisé

Mercier, Jean‐Pierre; Groeninckx, Gabriël; Goldblum, Kate

doi:10.1007/bf01976236

Cited by 9 publications

(3 citation statements)

References 7 publications

(4 reference statements)

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“…Les d6tails du processus de reeuit ont 6% donn6s duns la publication pr6c6dente (8). Elles furent soumises ensuite b, un recuit de cristallisution b, temp6rature 61ev6e.…”

Section: Partie Exp6rimentaleunclassified

“…Duns une publication rdcente (8), nous avons montr6 que le polyearbonate de bis-ph6nol-A eristallis6 eonstituait un systgme polymdrique partieuliSrement bien adapt6 une 6tude systdmatique des propri6t6s viseo-61astiques des polym~res semi-eristallins. Grgce gun traitement thermique ad6quat, on peut obtenir des 6chantillons de taux de cristallinitd diffdrents entre zdro et 20%.…”

Section: Introductionunclassified

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Étude du comportement viscoélastique du polycarbonate de bisphénol-A partiellement cristallisé

Mercier

Groeninckx

1969

Rheol Acta

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“…Les d6tails du processus de reeuit ont 6% donn6s duns la publication pr6c6dente (8). Elles furent soumises ensuite b, un recuit de cristallisution b, temp6rature 61ev6e.…”

Section: Partie Exp6rimentaleunclassified

Section: Introductionunclassified

Étude du comportement viscoélastique du polycarbonate de bisphénol-A partiellement cristallisé

Mercier

Groeninckx

1969

Rheol Acta

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“…Bisphenol-A polycarbonate is a crystallizable polymer, but crystallization' from the melt is so slow that the material is usually manufactured in amorphous form, although semicrystalline polycarbonate exhibits better high-temperature properties. 2 Conix and Jeurissen3 were the first to suggest accelerating the crystallization of polycarbonate by the addition of plasticizers. Other author^^^^ used partial swelling by solvent vapors to increase the rate of crystallization.…”

Section: Introductionmentioning

confidence: 99%

Crystallization of bisphenol‐A polycarbonate. I. Influence of trimellitic acid tridecyloctyl ester on the kinetics of crystallization

Gallez

Legras

Mercier

1976

J. Polym. Sci. Polym. Phys. Ed.

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The crystallization of bisphenol‐A polycarbonate plasticized by trimellitic acid tridecyloctyl ester (Morflex 525) has been studied. A half‐crystallization time of 100 min is observed at 170°C with 10% of plasticizer compared with a figure of 18,000 min for the unplasticized material. The kinetic study is limited to the primary crystallization process which can be described by an Avrami equation; however, the Avrami coefficients are much higher than usual. Studies on the effect of the preparation procedure of the samples and of premelting indicate that nucleation is at least partially heterogeneous.

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Phase transitions, relaxations, and properties of high polymers

Pechhold

Blasenbrey

1972

Angew. Makromol. Chem.

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Starting with a nondefective bundle of macromolecules (the ideal crystal) one gets a low-defective bundle (the real crystal) by introduction of stable defects (kinks, torsional defects, jogs and folds) which are compatible with the intra-and intermolecular potential. The cooperative statistical treatment of this bundle revealsunder a certain conditiona first order transition, connected with a jump in defectconcentrations. This transition corresponds in most cases to the melting of the polymer, in some polymers (e. g. trans-polybutadiene) it splits up into a solid state transition (large kinkblocks without torsions) and the melt transition (small kinkblocks, torsional defects, jogs and folds). In the case of polyethylene the bundle model has been shown to explain quantitatively the transition data (Tm, bHm, A V~) as well as the expansion coefficient and the compressibility of the melt together with their dependence on static pressure. The calculated short-range order also is in accordance with the X-ray and electron diffraction data. By introduction of cooperatively arranged gauche-areas (for planar molecules) the meander model is established which guarantees the isotropy of the melt. Assuming the bundle diameter (calculated to about 50 A which is in the range of the observed superstructure in amorphous polymers) to be constant during crystallization a lamellae-structure results in which the meander thickness is determined by the crystallization temperature. This two phase meander model is in accordance with the experiment and implies the key to the underst.anding of molecular motions in polymers. This will be shown by a quantitative molecular interpretation of the relaxation processes (secondary, main and crystalline relaxation) in a polymer as well as of its deformation behaviour (paraelasticity, plasticity). ZUS AMMENFASSUNG :Ausgehend von einem defektfreien Bundel aus Makromolekulen (Idealkristall) erhalt man den Realkristall durch Einfuhren stabiler Defekte (Kinken, Torsionsfehler, Jogs und Falten), die mit dem intra-und intermolekularen Potential vertriiglich sind. Die kooperativ-statistische Behandlung dieses Bundels zeigt unter gewissen Voraussetzungen eine Phasenumwandlung 1. Ordnung, die sich durch eine sprung-* Presented at the Scientific Symposium "The Physics and Chemistry of Fibre Materials", Miinchen, 3rd and 4th June 1971.

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Étude du comportement viscoélastique du polycarbonate de bisphénol-A partiellement cristallisé

Cited by 9 publications

References 7 publications

Étude du comportement viscoélastique du polycarbonate de bisphénol-A partiellement cristallisé

Étude du comportement viscoélastique du polycarbonate de bisphénol-A partiellement cristallisé

Crystallization of bisphenol‐A polycarbonate. I. Influence of trimellitic acid tridecyloctyl ester on the kinetics of crystallization

Phase transitions, relaxations, and properties of high polymers

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