Synthesis of chain-extended organifier and properties of polyurethane/clay nanocomposites

Clay organifier with hydroxyl end-group and relatively high molecular weight was synthesized. The clay treated with the organifier was suspended in DMF and the dispersibility of organoclay in polyurethane matrix was enhanced by applying the sonication to the suspension of organoclay in DMF. The d-spacing of organoclay was found to be 2.29 nm compared to 1. 18 nm of pristine montmorillonite. The polyurethane/clay nanocomposites formed an intercalated structure with some disorder and their d-spacings were about 2.6-2.7 nm. The barrier property, thermal stability and tensile properties significantly increased with increasing the dispersibility of organoclay. A 2.9-fold increase in tensile strength with 1 wt% of well-dispersed organoclay, a 41% decrease in oxygen permeability and a 1.7-fold increase in Young's modulus at 5 wt% of well-dispersed organoclay were achieved. (C) 2004 Elsevier Ltd. All rights reserved.
Publisher
ELSEVIER SCI LTD
Issue Date
2004-08
Language
ENG
Keywords

LAYERED SILICATE NANOCOMPOSITES; MONTMORILLONITE/POLYURETHANE NANOCOMPOSITES; BEHAVIOR; POLYMERIZATION; INTERCALATION; BARRIER; STYRENE

Citation

POLYMER, v.45, pp.6045 - 6057

ISSN
0032-3861
URI
http://hdl.handle.net/10203/2279
Appears in Collection
CBE-Journal Papers(저널논문)
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