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Title: Crystal Growth in Alumina/poly(ethylene terephthalate) Nanocomposite Films

Abstract

The crystal growth and morphology in 150-nm-thick PET nanocomposite thin films with alumina (Al{sub 2}O{sub 3}) nanoparticle fillers (38 nm size) were investigated for nanoparticle loadings from 0 to 5 wt%. Transmission electron microscopy of the films showed that at 1 wt% Al{sub 2}O{sub 3}, the nanoparticles were well dispersed in the film and the average size was close to the reported 38 nm. Above 2 wt% Al{sub 2}O{sub 3}, the nanoparticles started to agglomerate. The crystal growth and morphological evolution in the PET nanocomposite films kept at an isothermal temperature of 217 C were monitored as a function of the holding time using in situ atomic force microscopy. It was found that the crystal nucleation and growth of PET was strongly dependent on the dispersed particles in the films. At 1 wt% Al{sub 2}O{sub 3}, the overall crystal growth rate of PET lamellae was slower than that of the PET homopolymer films. Above 2 wt% Al{sub 2}O{sub 3}, the crystal growth rate increased with nanoparticle loading because of heterogeneous nucleation. In addition, in these PET nanocomposite thin films, the Al{sub 2}O{sub 3} nanoparticles induced preferentially oriented edge-on lamellae with respect to the surface, which was not the case inmore » unfilled PET as determined by grazing-incidence X-ray diffraction.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
929872
Report Number(s):
BNL-80444-2008-JA
TRN: US200822%%922
DOE Contract Number:
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Polymer Science Part B: Polymer Physics; Journal Volume: 45; Journal Issue: 7
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CRYSTAL GROWTH; MORPHOLOGY; ALUMINIUM OXIDES; POLYETHYLENES; LAMELLAE; NUCLEATION; PARTICLE SIZE; THIN FILMS; COMPOSITE MATERIALS; NANOSTRUCTURES; national synchrotron light source

Citation Formats

Yang,H., Bhimaraj, P., Yang, L., Siegel, R., and Schadler, L. Crystal Growth in Alumina/poly(ethylene terephthalate) Nanocomposite Films. United States: N. p., 2007. Web. doi:10.1002/polb.21096.
Yang,H., Bhimaraj, P., Yang, L., Siegel, R., & Schadler, L. Crystal Growth in Alumina/poly(ethylene terephthalate) Nanocomposite Films. United States. doi:10.1002/polb.21096.
Yang,H., Bhimaraj, P., Yang, L., Siegel, R., and Schadler, L. Mon . "Crystal Growth in Alumina/poly(ethylene terephthalate) Nanocomposite Films". United States. doi:10.1002/polb.21096.
@article{osti_929872,
title = {Crystal Growth in Alumina/poly(ethylene terephthalate) Nanocomposite Films},
author = {Yang,H. and Bhimaraj, P. and Yang, L. and Siegel, R. and Schadler, L.},
abstractNote = {The crystal growth and morphology in 150-nm-thick PET nanocomposite thin films with alumina (Al{sub 2}O{sub 3}) nanoparticle fillers (38 nm size) were investigated for nanoparticle loadings from 0 to 5 wt%. Transmission electron microscopy of the films showed that at 1 wt% Al{sub 2}O{sub 3}, the nanoparticles were well dispersed in the film and the average size was close to the reported 38 nm. Above 2 wt% Al{sub 2}O{sub 3}, the nanoparticles started to agglomerate. The crystal growth and morphological evolution in the PET nanocomposite films kept at an isothermal temperature of 217 C were monitored as a function of the holding time using in situ atomic force microscopy. It was found that the crystal nucleation and growth of PET was strongly dependent on the dispersed particles in the films. At 1 wt% Al{sub 2}O{sub 3}, the overall crystal growth rate of PET lamellae was slower than that of the PET homopolymer films. Above 2 wt% Al{sub 2}O{sub 3}, the crystal growth rate increased with nanoparticle loading because of heterogeneous nucleation. In addition, in these PET nanocomposite thin films, the Al{sub 2}O{sub 3} nanoparticles induced preferentially oriented edge-on lamellae with respect to the surface, which was not the case in unfilled PET as determined by grazing-incidence X-ray diffraction.},
doi = {10.1002/polb.21096},
journal = {Journal of Polymer Science Part B: Polymer Physics},
number = 7,
volume = 45,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}