Differential scanning calorimetry of spin-oriented polyester yarn |
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Authors: | S B Warner |
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Institution: | (1) Celanese Research Company, 07901 Summit, New Jersey, USA;(2) Present address: Kimberly-Clark Corporation, 54956 Neenah, WI |
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Abstract: | Polyester yarn spun over a range of wind-up speeds has been characterized using differential scanning calorimetry. Samples prohibited from shrinking during the thermal analysis show slightly smaller heats of fusion and crystallization and reduced cold crystallization temperatures than samples that are free-to-shrink, particularly in the intermediate wind-up speed region. One critical observation made is that the cold crystallization temperature reaches a minimum at some relatively low overall molecular orientation ( n 0.020) and fails to decrease further. A likely explanation is that crystallization continuously removes polymer from the melt in the spinline in regions where the local orientation reaches some critically high value.
Zusammenfassung Mit verschiedenen Aufspulgeschwindigkeiten gesponnenes Polyestergarn wurde durch DSC charackterisiert. Die während der tyermischen Analyse am Schrumpfen gehinderten Proben zeigen, besonders bei mittleren Aufspulgeschwindigkeiten, eine etwas geringere Schmelz- und Kristallisationswärme und niedrigere kalte Kristallisationstemperaturen als Proben, die ungehindert schrumpfen konnten. Die kalte Kristallisationstemperatur erreicht bei enier relativ niedrigen Gesamtmolekularorientierung ( n 0.020) ein Minimum und nimmt nicht weiter ab. Wahrscheinlich ist, dass durch die Kristallisation das Polymer in den Bereichen, in denen die lokale Orientierung einen kritischen Wert erreicht, kontinuierlich aus der Schmelze entfernt wird.
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![ocy](/content/0tn1839u7x1hp352/xxlarge1086.gif) ![gcy](/content/0tn1839u7x1hp352/xxlarge1075.gif) ![zcy](/content/0tn1839u7x1hp352/xxlarge1079.gif) ![ncy](/content/0tn1839u7x1hp352/xxlarge1085.gif) ![acy](/content/0tn1839u7x1hp352/xxlarge1072.gif) ![chcy](/content/0tn1839u7x1hp352/xxlarge1095.gif) ![iecy](/content/0tn1839u7x1hp352/xxlarge1077.gif) ![ncy](/content/0tn1839u7x1hp352/xxlarge1085.gif) ![icy](/content/0tn1839u7x1hp352/xxlarge1080.gif) .
The author appreciates the input provided by Dr. R. M. Mininni and the help of Dr. W. E. Bessey in fiber spinning and Ms. E. Fernekess in thermal analysis. The author is grateful to Celanese Corporation for allowing publication of this work. |
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