TY - CHAP
T1 - Epoxy-clay nanocomposites
T2 - Morphology, moisture absorption behavior and thermo-mechanical properties
AU - HU, Chugang
AU - KIM, Jang Kyo
AU - BARI, Shannin
N1 - Funding Information:
This research was supported by the David and Lucile Packard Foundation as well as by DOE grants DE-SC0004765, NSF-IOS0843119, and GBMF3788 to A.Z.W.
Publisher Copyright:
© 2004 Woodhead Publishing Limited. All rights reserved.
PY - 2004/6/1
Y1 - 2004/6/1
N2 - The morphology and moisture barrier characteristics are studied of epoxy-based nanocomposites reinforced with layered silicates. Two different types of organoclay, including the octadecylamine modified montmorillonite (BOP) and the quaternary alkylamine modified montmorillonite (KH-MT), were studied. The X-ray diffraction (XRD) and transmission electron microscopy (TEM) indicated the fonnation of intercalated nanocomposite for the KH-MT system, while intercalated/ordered-exfoliated nanocomposite for BOP system. The moisture absorption behaviour was different for different organoclays: the moisture absorption rate was similar for the neat polymer and the KH-MT system, which could be fitted to the Fick's second law. The moisture absorption rate of the BOP system was much lower than the two systems, which was predicted using a non-Fickian model based on the 1D Langmuirian solution. The deviation from the Fickian diffusion for the latter system is associated with exfoliated morphology and more unifonn dispersion of clay particles, which altered the diffusion path of water molecules in the nanocomposite. The moisture diffusivity of nanocomposites in general decreased with increasing clay content, the reduction being more pronounced for the BOP system. Moisture-induced thennomechanical properties changes for these two nanocomposites were studied as well.
AB - The morphology and moisture barrier characteristics are studied of epoxy-based nanocomposites reinforced with layered silicates. Two different types of organoclay, including the octadecylamine modified montmorillonite (BOP) and the quaternary alkylamine modified montmorillonite (KH-MT), were studied. The X-ray diffraction (XRD) and transmission electron microscopy (TEM) indicated the fonnation of intercalated nanocomposite for the KH-MT system, while intercalated/ordered-exfoliated nanocomposite for BOP system. The moisture absorption behaviour was different for different organoclays: the moisture absorption rate was similar for the neat polymer and the KH-MT system, which could be fitted to the Fick's second law. The moisture absorption rate of the BOP system was much lower than the two systems, which was predicted using a non-Fickian model based on the 1D Langmuirian solution. The deviation from the Fickian diffusion for the latter system is associated with exfoliated morphology and more unifonn dispersion of clay particles, which altered the diffusion path of water molecules in the nanocomposite. The moisture diffusivity of nanocomposites in general decreased with increasing clay content, the reduction being more pronounced for the BOP system. Moisture-induced thennomechanical properties changes for these two nanocomposites were studied as well.
UR - http://www.scopus.com/inward/record.url?scp=85138316268&partnerID=8YFLogxK
U2 - 10.1016/B978-1-85573-831-7.50117-6
DO - 10.1016/B978-1-85573-831-7.50117-6
M3 - Chapter
AN - SCOPUS:85138316268
SP - 689
EP - 694
BT - Composite Technologies for 2020
PB - Elsevier
ER -