alexa The structure of Isotactic Polypropylene Crystallized from the Melt | OMICS International | Abstract
ISSN: 2157-7048

Journal of Chemical Engineering & Process Technology
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Research Article

The structure of Isotactic Polypropylene Crystallized from the Melt

Sokainah Rawashdeh1* and Ismail Al-Raheil2
1Applied science department, Faculty of Engineering Technology, Al-Balqaa Applied University, Amman, Jordan 
2Department of Physics, University College in Lieth, Umm Al-Qura University, Makkah , KSA
Corresponding Author : Sokainah Rawashdeh
Applied science department
Faculty of Engineering Technology
Al-Balqaa Applied University
Amman, Jordan
E-mail: [email protected]
Received August 22, 2012; Accepted October 22, 2012; Published October 26, 2012
Citation: Rawashdeh S, Al-Raheil I (2012) The structure of Isotactic Polypropylene Crystallized from the Melt. J Chem Eng Process Technol 3:140. doi: 10.4172/2157-7048.1000140
Copyright: © 2012 Rawashdeh S, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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Abstract

The melting behavior of isotactic polypropylene was studied in the hot stage mounted on polarizing optical microscope supported by photomonitor. Over a wide range of crystallization temperature there are two main types of spherulites, α and β spherulites for this polymer α spherulites may exist in three forms α1, α2 and mixed of α1 and α2. The α2-form can be obtained at high crystallization temperature above 145°C and α1 can be observed at low crystallization temperatures below 132°C. The mixed α-spherulites can be obtained between 132°C and 145°C. However, the β-phase form small proportion of the total phase not more than 15% and usually exist when the crystallization temperature below 132°C. If the sample crystallized from the melt it shows usually two melting peaks. However, when the temperature of the sample was increased to crystallize in a second step at higher temperature it shows two melting peaks and if the second step of crystallization was very close to melting point it shows only one single peak, since the reorganization of crystals process will be stopped completely.

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