The effect of a sodium octacosanoate-based nucleating agent on the crystallization of thermoplastic polyurethanes.(Report): An article from: Polymer Engineering and Science
Book Details
PublisherSociety of Plastics Engineers, Inc.
ISBN / ASINB0051XSD7I
ISBN-13978B0051XSD73
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This digital document is an article from Polymer Engineering and Science, published by Society of Plastics Engineers, Inc. on May 1, 2011. The length of the article is 5846 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available immediately after purchase. You can view it with any web browser.
From the author: Sodium octacosanoate ([NaC.sub.28-32]) is commonly used as a nucleating agent in polyester and polyamide formulations. In this work, the effect of adding this agent to three chemically identical thermoplastic polyurethanes (TPUs), but with distinct molecular weights, was addressed, focusing on the study of the crystallization phenomenon. The modified Avrami and Avrami-Ozawa kinetic models were applied to the isothermal and non-isothermal crystallization processes, respectively, and both indicated faster crystallization when the nucleating agent was used, with an increase in temperature and rate of crystallization of the TPU. Such effect was partly attributed to the formation of a larger number of crystallization nuclei in comparison to the neat TPU. Besides, the nucleating effect was more pronounced for the TPU with the lowest molecular weight (30,000 Dalton). The Avrami and Avrami-Ozawa models indicated that the TPU crystallization process occurs with the development of two-dimensional lamellar aggregates, axialites, and that the incorporation of the nucleating agent does not alter this geometry. POLYM. ENG. SCI., 51:931-939, 2011. [C]2011 Society of Plastics Engineers
Citation Details
Title: The effect of a sodium octacosanoate-based nucleating agent on the crystallization of thermoplastic polyurethanes.(Report)
Author: C.P.M. Freitag
Publication:Polymer Engineering and Science (Magazine/Journal)
Date: May 1, 2011
Publisher: Society of Plastics Engineers, Inc.
Volume: 51 Issue: 5 Page: 931(9)
Article Type: Report
Distributed by Gale, a part of Cengage Learning
From the author: Sodium octacosanoate ([NaC.sub.28-32]) is commonly used as a nucleating agent in polyester and polyamide formulations. In this work, the effect of adding this agent to three chemically identical thermoplastic polyurethanes (TPUs), but with distinct molecular weights, was addressed, focusing on the study of the crystallization phenomenon. The modified Avrami and Avrami-Ozawa kinetic models were applied to the isothermal and non-isothermal crystallization processes, respectively, and both indicated faster crystallization when the nucleating agent was used, with an increase in temperature and rate of crystallization of the TPU. Such effect was partly attributed to the formation of a larger number of crystallization nuclei in comparison to the neat TPU. Besides, the nucleating effect was more pronounced for the TPU with the lowest molecular weight (30,000 Dalton). The Avrami and Avrami-Ozawa models indicated that the TPU crystallization process occurs with the development of two-dimensional lamellar aggregates, axialites, and that the incorporation of the nucleating agent does not alter this geometry. POLYM. ENG. SCI., 51:931-939, 2011. [C]2011 Society of Plastics Engineers
Citation Details
Title: The effect of a sodium octacosanoate-based nucleating agent on the crystallization of thermoplastic polyurethanes.(Report)
Author: C.P.M. Freitag
Publication:Polymer Engineering and Science (Magazine/Journal)
Date: May 1, 2011
Publisher: Society of Plastics Engineers, Inc.
Volume: 51 Issue: 5 Page: 931(9)
Article Type: Report
Distributed by Gale, a part of Cengage Learning
