Effects of a silane coupling agent on the exfoliation of organoclay layers in polyurethane/organoclay nanocomposite foams?
- Authors
- Han, Mi Sun; Kim, Youn Hee; Han, Sung Jae; Choi, Seok Jin; Kim, Sang Bum; Kim, Woo Nyon
- Issue Date
- 5-10월-2008
- Publisher
- JOHN WILEY & SONS INC
- Keywords
- organoclay; polyurethanes; nanocomposites
- Citation
- JOURNAL OF APPLIED POLYMER SCIENCE, v.110, no.1, pp.376 - 386
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF APPLIED POLYMER SCIENCE
- Volume
- 110
- Number
- 1
- Start Page
- 376
- End Page
- 386
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/122570
- DOI
- 10.1002/app.28521
- ISSN
- 0021-8995
- Abstract
- An attempt was made to synthesize polyurethane (PU)/organoclay nanocomposite foams with high thermal insulation properties. The organoclay was modified by polymeric 4,4'-diphenylmethane diisocyanate (PMDI) with a Silane Coupling agent. The structure of the organoclay-modified PMDI with the silane coupling agent was determined by Fourier transform infrared spectroscopy and nuclear magnetic resonance. Transmission electron micrographs and wide-angle X-ray diffraction patterns showed that the interlayer distance increased for the PU/organoclay nanocomposites with the addition of the silane coupling agent. It was expected that the distance between the organoclay layers Would increase and that the organoclay would be dispersed on a nanoscale in the PU matrix because of the organic/inorganic hybrid bond formation between the organoclay and silane coupling agent. Compressive and flexural strengths of the PU/silane coupling agent/organoclay nanocomposite foams were similar to those of the PU/organoclay nanocomposite foams. However, the thermal conductivity appreciably decreased from 0.0250 to 0.0230 W/m h degrees C in the PU/silane Coupling agent/organoclay nanocomposite foams. Scanning electron micrographs showed that the cell size of the PU/silane Coupling agent/clay nanocomposite foams also decreased. On the basis of these results, it is suggested that the smaller cell size and lower thermal conductivity of the PU/silane Coupling agent/organoclay nanocomposite foams were mainly due to enhanced exfoliation of the organoclay layers by the silane coupling reaction. (C) 2008 Wiley Periodicals, Inc.
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Collections - College of Engineering > Department of Chemical and Biological Engineering > 1. Journal Articles
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