Cinetique de cristallisation du polylauryllactame

Manescalchi, Francesco; Rossi, R. Hoyos de; Mattiussi, A.

doi:10.1016/0014-3057(73)90020-7

Cited by 7 publications

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“…This is a higher value than the n = 1.57 recorded by Chuah for a different grade of Nylon 12 and the value of n recorded for the primary stage of crystallization using the Jeziorny treatment. However, reasonable agreement was achieved between the calculated value of n and that reported by Maneschalchi63 of n = 5.06 for Nylon 12 scanned isothermally. The value of n shows a pronounced difference between the dynamic and quiescent crystallization kinetics, the former yields a slower rate and the value of n can be linked to the growth of a two‐stage process with fibrillar morphology, as discussed by Wunderlich,1 in agreement with the observations drawn from the Jeziorny treatment of the data.…”

Section: Resultssupporting

confidence: 85%

Nonisothermal and isothermal crystallization kinetics of nylon‐12

McFerran

Armstrong

McNally

2008

J of Applied Polymer Sci

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The isothermal and nonisothermal crystallization behavior of Nylon 12 was investigated using differential scanning calorimetry (DSC). An Avrami analysis was used to study the isothermal crystallization kinetics of Nylon 12, the Avrami exponent (n) determined and its relevance to crystal growth discussed and an activation energy for the process evaluated using an Arrhenius type expression. The Lauritzen and Hoffman analysis was used to examine the spherulitic growth process of the primary crystallization stage of Nylon 12. The surface-free energy and work of chain folding were calculated using a procedure reported by Hoffmann and the work of chain folding per molecular fold (r) and chain stiffness of Nylon 12 (q) was calculated and compared to values reported for Nylons 6,6 and 11. The Jeziorny modification of the Avrami analysis, Cazé and Chuah average Avrami parameter methods and Ozawa equation were used in an attempt to model the nonisothermal crystallization kinetics of Nylon 12. A combined Avrami and Ozawa treatment, described by Liu, was used to more accurately model the nonisothermal crystallization kinetics of Nylon 12. The activation energy for nonisothermal crystallization processes was determined using the Kissinger method for Nylon 12 and compared with values reported previously for Nylon 6,6 and Nylon 11.

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Section: Resultssupporting

confidence: 85%

Nonisothermal and isothermal crystallization kinetics of nylon‐12

McFerran

Armstrong

McNally

2008

J of Applied Polymer Sci

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Rates of Crystallization of Polymers

Magill

1999

The Wiley Database of Polymer Properties

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Copolymers of anionic polymerization of octanelactam with laurolactam. II. Kinetics of isothermal crystallization

Arvanitoyannis

Kehayoglou

1993

Angew. Makromol. Chem.

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The isothermal crystallization kinetics of the anionic copolyamides of o-octanelactam (OL) with o-laurolactam (LL) (nylon-8/nylon-12), covering a wide composition range (0/100-100/0 OL/LL, mol/mol), was established according to the Avrami equation by the use of differential scanning calorimetry. The crystallization parameters half-time crystallization (t,,,), Avrami index (n), rate constant (k), and reduced crystallinity werc determined for various crystallization temperatures. These parameter values are correlated to the composition of the copolyamides, the crystallization and supercooling temperature, and the results are discussed.Differences in kinetic parameter values between the homopolymers of this paper and those for the hydrolytic nylon-8 and nylon-1 2 reported in literature were observed and discussed. ZUSAMMENFASSUNG:Die Kinetik der isothermen Kristallisation des anionisch hergestellten Copolyamids PA 8/12 aus o-Octanlactam (OL) und w-Laurinlactam (12-Dodecanlactam) (LL) wurde nach der Avrami-Gleichung uber den gesamten Zusammensetzungsbereich mittels DSC untersucht. Die Kristallisationsparameter Halbwertszeit (t,,,), Avrami-Index (n), Geschwindigkeitskonstante (k) und Kristallinitatsgrad wurden fur verschiedene Kristallisationstemperaturen bestimmt. Eine Beziehung dieser Parameter zur Copolyamidzusammensetzung sowie zu Kristallisations-und Unterkuhlungstemperaturen wurde untersucht und die Ergebnisse diskutiert. Desweiteren wurden die Werte der hier behandelten mit denen der in der Literatur beschriebenen Homopolymeren verglichen.

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Cinetique de cristallisation du polylauryllactame

Cited by 7 publications

References 0 publications

Nonisothermal and isothermal crystallization kinetics of nylon‐12

Nonisothermal and isothermal crystallization kinetics of nylon‐12

Rates of Crystallization of Polymers

Copolymers of anionic polymerization of octanelactam with laurolactam. II. Kinetics of isothermal crystallization

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