eprintid: 100
rev_number: 2
eprint_status: archive
userid: 1
dir: disk0/00/00/01/00
datestamp: 2023-11-09 15:15:44
lastmod: 2023-11-09 15:15:44
status_changed: 2023-11-09 15:12:48
type: article
metadata_visibility: show
creators_name: Wilkinson, A.N.
creators_name: Man, Z.
creators_name: Stanford, J.L.
creators_name: Matikainen, P.
creators_name: Clemens, M.L.
creators_name: Lees, G.C.
creators_name: Liauw, C.M.
title: Structure and dynamic mechanical properties of melt intercalated polyamide 6 - Montmorillonite nanocomposites
ispublished: pub
keywords: Crystalline materials; Extruders; Fillers; Morphology; Nanostructured materials; Silicate minerals; Thermoanalysis; Transmission electron microscopy; X ray diffraction, Amorphous polymer; Organoclay; Thermal behaviour; Wetted aggregates, Polyamides
note: cited By 40
abstract: Polymer-layered silicate nanocomposites (PLSN), based on polyamide 6 (PA6) and montmorillonite (MMT) modified with an octadecylammonium salt, were produced via melt compounding in a co-rotating twin-screw extruder. Wide angle X-ray diffraction (WAXD) and TEM revealed a PLSN containing 3.3 by weight (wt.-) of MMT to exhibit a mixed exfoliated/intercalated morphology, consisting mainly of individual silicate lamellae together with some intercalated stacks, resulting in a mean value of 1.8 lamellae per particle. In contrast, a PLSN containing a higher level of 7.2 wt- MMT exhibited a more ordered intercalated structure, consisting mainly of a distribution of lamellae stacks with a mean value of 3.8 lamellae per particle. The dispersion of MMT in the PLSN generated very large polymer-filler interfacial areas, resulting in significant increase in the volume of constrained PA6 chain segments. Consequently, significant changes in the ratio of α/γ crystallites and in the thermal behaviour of the matrix PA6 were observed during WAXD, DSC and dynamic-mechanical thermal analysis (DMTA) studies of the PLSN. In particular, damping data from DMTA showed relaxations between Tg and Tm resulting from amorphous polymer chain segments constrained at the polymer-filler interface, indicating the formation of a continuous phase of constrained polymer. In contrast, a PA6 microcomposite formed using unmodified MMT generated much lower polymer-filler interfacial area, with most of the MMT residing within large, poorly wetted aggregates. Consequently, changes to the thermal behaviour of the matrix PA6 were much less significant than those induced in the PLSN. © 2006 WILEY-VCH Verlag GmbH & Co. KGaA.
date: 2006
official_url: https://www.scopus.com/inward/record.uri?eid=2-s2.0-33747618698&doi=10.1002%2fmame.200600150&partnerID=40&md5=305bcf54924298d2a6cd4cc2f7710831
id_number: 10.1002/mame.200600150
full_text_status: none
publication: Macromolecular Materials and Engineering
volume: 291
number: 8
pagerange: 917-928
refereed: TRUE
issn: 14387492
citation:   Wilkinson, A.N. and Man, Z. and Stanford, J.L. and Matikainen, P. and Clemens, M.L. and Lees, G.C. and Liauw, C.M.  (2006) Structure and dynamic mechanical properties of melt intercalated polyamide 6 - Montmorillonite nanocomposites.  Macromolecular Materials and Engineering, 291 (8).  pp. 917-928.  ISSN 14387492