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- W2055491569 abstract "Two series of linear poly-ϵ-caprolactams were synthesized in a range of molecular weights (12,000–42,000) and with different polydispersities (Mw/Mn— 1·55–2·00). Number and weight molecular weights were measured by three methods, viz, end-group titration, solution viscometry and gel permeation chromatography. Melt flow-behaviour was studied with a capillary rheometer and analysed in terms of existing theories of the flow behaviour of polydisperse polymers. On a effectué la synthèse de deux séries de poly-ϵ-caprolactames linéaires dans un domaine de poids moléculaire (12.000–42.000) et avec différentes polydispersités (Mw/Mn = 1.55-2.00). On a déterminé la masse moléculaire en nombre et en poids par trois méthodes: titration des groupes en bout de chaine, viscosimétrie en solution et chromatographie par perméation de gel. On a étudié le comportement de l'écoulement à l'état fondu avec un rhéomètre à capillaire et on l'a analysé à l'aide des théories existantes sur le comportement à l'écoulement des polymères polydispersés. Sono state sintetizzate due serie di poli-ϵ-caprolattame nell'intervallo di pesi molecolari 12.000–24.000 con diverse polidispersità (Mw/Mn = 1.55-2.00). Il peso molecolare medio ponderale e numerico è stato misurato con tre metodi: titolazione dei gruppi terminali, viscosità in soluzione e cromatografia su gel. Il comportamento al flusso è stato studiato con un reometro capillare ed analizzato in base alle teorie esistenti sul comportamento al flusso dei polimeri polidispersi. Zwei Serien von linearen Poly-ϵ-caprolactamen wurden synthetisiert in einem Molekulargewichtsbereich (12.000–42.000) und mit verschiedener Uneinheitlichkeit (Mw/Mn = 1.55-2.00). Zahlen- und Gewichtsmittelwerte des Molekulargewichts wurden mit drei Methoden bestimmt: Endgruppentitration, Lösungsisvkosimetrie und Gelpermeationschromatographie. Das SchmelzflußVerhalten wurde mit einem Kapillarthermometer untersucht und mit den bestehenden Theorien zum Fließverhalten von polydispersen Polymeren analysiert." @default.
- W2055491569 created "2016-06-24" @default.
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- W2055491569 date "1972-03-01" @default.
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- W2055491569 title "Relationship between molecular weight distribution and flow curves of poly-ϵ-caprolactam" @default.
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- W2055491569 doi "https://doi.org/10.1016/0014-3057(72)90111-5" @default.
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