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Title: Morphological Features and Melting Behavior of Nanocomposites Based on Isotactic Polypropylene and Multiwalled Carbon Nanotubes

Abstract

Nanocomposites based on low molar mass isotactic polypropylene (iPP) and a low concentrations (1-2 wt %) of multiwalled carbon nanotubes (MWCNTs) were studied using thermal analysis, optical and electronic microscopy, and X-ray diffraction/scattering techniques. It was first determined that MWCNT decrease induction time and act as nucleating agents of the iPP crystals during nonisothermal crystallization. One of the consequences of the nucleation effect was that the original spherulitic morphology of iPP was transformed into a fibrillar-like. The corresponding long period of the original well-defined lamellar structure slightly increased suggesting the formation of thicker crystals in samples containing MWCNT. The nature of the {alpha}-iPP crystalline structure was not affected by MWCNT. After nonisothermal crystallization, two melting endotherms were present during thermal scanning of the iPP/MWCNT nanocomposites their proportion changing with the heating rate. After resolving the total DSC signal in its components using MDSC, the overall evolution of such behavior could be explained in terms of the melting/recrystallization mechanism.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
BROOKHAVEN NATIONAL LABORATORY (BNL), NATIONAL SYNCHROTRON LIGHT SOURCE (NSLS)
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
930555
Report Number(s):
BNL-80679-2008-JA
Journal ID: ISSN 0021-8995; JAPNAB; TRN: US200904%%784
DOE Contract Number:  
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Polymer Science; Journal Volume: 106; Journal Issue: 4
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CARBON; CRYSTAL STRUCTURE; CRYSTALLIZATION; HEATING RATE; INDUCTION; MELTING; MICROSCOPY; MORPHOLOGY; NANOTUBES; NUCLEATION; POLYPROPYLENE; RECRYSTALLIZATION; SCATTERING; THERMAL ANALYSIS; X-RAY DIFFRACTION

Citation Formats

Avila-Orta,C., Medellin-Rodriguez, F., Davila-Rodriguez, M., Aguirre-Figueroa, Y., Yoon, K., and Hsiao, B. Morphological Features and Melting Behavior of Nanocomposites Based on Isotactic Polypropylene and Multiwalled Carbon Nanotubes. United States: N. p., 2007. Web. doi:10.1002/app.26823.
Avila-Orta,C., Medellin-Rodriguez, F., Davila-Rodriguez, M., Aguirre-Figueroa, Y., Yoon, K., & Hsiao, B. Morphological Features and Melting Behavior of Nanocomposites Based on Isotactic Polypropylene and Multiwalled Carbon Nanotubes. United States. doi:10.1002/app.26823.
Avila-Orta,C., Medellin-Rodriguez, F., Davila-Rodriguez, M., Aguirre-Figueroa, Y., Yoon, K., and Hsiao, B. Mon . "Morphological Features and Melting Behavior of Nanocomposites Based on Isotactic Polypropylene and Multiwalled Carbon Nanotubes". United States. doi:10.1002/app.26823.
@article{osti_930555,
title = {Morphological Features and Melting Behavior of Nanocomposites Based on Isotactic Polypropylene and Multiwalled Carbon Nanotubes},
author = {Avila-Orta,C. and Medellin-Rodriguez, F. and Davila-Rodriguez, M. and Aguirre-Figueroa, Y. and Yoon, K. and Hsiao, B.},
abstractNote = {Nanocomposites based on low molar mass isotactic polypropylene (iPP) and a low concentrations (1-2 wt %) of multiwalled carbon nanotubes (MWCNTs) were studied using thermal analysis, optical and electronic microscopy, and X-ray diffraction/scattering techniques. It was first determined that MWCNT decrease induction time and act as nucleating agents of the iPP crystals during nonisothermal crystallization. One of the consequences of the nucleation effect was that the original spherulitic morphology of iPP was transformed into a fibrillar-like. The corresponding long period of the original well-defined lamellar structure slightly increased suggesting the formation of thicker crystals in samples containing MWCNT. The nature of the {alpha}-iPP crystalline structure was not affected by MWCNT. After nonisothermal crystallization, two melting endotherms were present during thermal scanning of the iPP/MWCNT nanocomposites their proportion changing with the heating rate. After resolving the total DSC signal in its components using MDSC, the overall evolution of such behavior could be explained in terms of the melting/recrystallization mechanism.},
doi = {10.1002/app.26823},
journal = {Journal of Applied Polymer Science},
number = 4,
volume = 106,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}