Free volume sizes in intercalated polyamide 6/clay nanocomposites
(2005) In Polymer 46(19). p.8239-8249- Abstract
- The effect of incorporating modified clay into a polyamide 6 (PA6) matrix, on the free volume cavity sizes and the thermal and viscoelastic properties of the resulting nanocomposite, was studied with positron annihilation lifetime spectroscopy, differential scanning calorimetry and dynamic mechanical analysis. At low concentrations of clay the fraction of PA6 crystals melting close to 212 degrees C was increased, while the fraction of the a-form PA6 crystals, melting close to 222 degrees C, was reduced. At higher concentrations of clay, a crystal phase with increased thermal stability emerged. Addition of more than 19 wt% clay caused a reduction of the heat of fusion of PA6. An unexpected reduction of the Delta C-p at the glass transition,... (More)
- The effect of incorporating modified clay into a polyamide 6 (PA6) matrix, on the free volume cavity sizes and the thermal and viscoelastic properties of the resulting nanocomposite, was studied with positron annihilation lifetime spectroscopy, differential scanning calorimetry and dynamic mechanical analysis. At low concentrations of clay the fraction of PA6 crystals melting close to 212 degrees C was increased, while the fraction of the a-form PA6 crystals, melting close to 222 degrees C, was reduced. At higher concentrations of clay, a crystal phase with increased thermal stability emerged. Addition of more than 19 wt% clay caused a reduction of the heat of fusion of PA6. An unexpected reduction of the Delta C-p at the glass transition, contradicting the measured reduction of the heat of fusion, was detected, indicating an altered mobility in the non-crystalline regions. The viscoelastic response of PA6/clay nanocomposites, as compared to unfilled PA6, pointed towards a changed mobility in the non-crystalline regions. At high concentrations of clay (> 19 wt%) an increase of the free volume cavity diameter was observed, indicating a lower chain packing efficiency in the PA6/clay nanocomposites. The increased free volume sizes were present both above and below the glass transition temperature of PA6. (c) 2005 Elsevier Ltd. All rights reserved. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/152519
- author
- Winberg, Petra LU ; Eldrup, Morten LU ; Pedersen, N J ; van Es, M A and Maurer, Frans LU
- organization
- publishing date
- 2005
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Polymer
- volume
- 46
- issue
- 19
- pages
- 8239 - 8249
- publisher
- Elsevier
- external identifiers
-
- wos:000231573100049
- scopus:24044520740
- ISSN
- 0032-3861
- DOI
- 10.1016/j.polymer.2005.06.063
- language
- English
- LU publication?
- yes
- additional info
- The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Polymer and Materials Chemistry (LTH) (011001041)
- id
- 7a35ef38-1fe0-446e-9b1d-791b2b5ad84a (old id 152519)
- date added to LUP
- 2016-04-01 15:46:47
- date last changed
- 2022-04-07 00:45:13
@article{7a35ef38-1fe0-446e-9b1d-791b2b5ad84a,
abstract = {{The effect of incorporating modified clay into a polyamide 6 (PA6) matrix, on the free volume cavity sizes and the thermal and viscoelastic properties of the resulting nanocomposite, was studied with positron annihilation lifetime spectroscopy, differential scanning calorimetry and dynamic mechanical analysis. At low concentrations of clay the fraction of PA6 crystals melting close to 212 degrees C was increased, while the fraction of the a-form PA6 crystals, melting close to 222 degrees C, was reduced. At higher concentrations of clay, a crystal phase with increased thermal stability emerged. Addition of more than 19 wt% clay caused a reduction of the heat of fusion of PA6. An unexpected reduction of the Delta C-p at the glass transition, contradicting the measured reduction of the heat of fusion, was detected, indicating an altered mobility in the non-crystalline regions. The viscoelastic response of PA6/clay nanocomposites, as compared to unfilled PA6, pointed towards a changed mobility in the non-crystalline regions. At high concentrations of clay (> 19 wt%) an increase of the free volume cavity diameter was observed, indicating a lower chain packing efficiency in the PA6/clay nanocomposites. The increased free volume sizes were present both above and below the glass transition temperature of PA6. (c) 2005 Elsevier Ltd. All rights reserved.}},
author = {{Winberg, Petra and Eldrup, Morten and Pedersen, N J and van Es, M A and Maurer, Frans}},
issn = {{0032-3861}},
language = {{eng}},
number = {{19}},
pages = {{8239--8249}},
publisher = {{Elsevier}},
series = {{Polymer}},
title = {{Free volume sizes in intercalated polyamide 6/clay nanocomposites}},
url = {{http://dx.doi.org/10.1016/j.polymer.2005.06.063}},
doi = {{10.1016/j.polymer.2005.06.063}},
volume = {{46}},
year = {{2005}},
}