| Synthesis and characterization of multi-walled carbon nanotubes functionalized with hyperbranched poly(urea-urethane). | |
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MedLine Citation:
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PMID: 21121323 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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Two types of hyperbranched poly(urea-urethane)-functionalized multi-walled carbon nanotubes (GHPU) have been synthesized in the presence of bis- and tris-hydroxy terminated carbon nanotubes (MWNT-OH). For comparison of the grafting efficiency on carbon nanotubes, pure hyper-branched poly(urea-urethane)s (HPUs) were also synthesized to prepare pristine carbon nanotubes-reinforced nanocomposites (HPNTs). Better MWNT dispersion in the polymer matrix was obtained for GHPU than for HPNT, and the effect was superior in the case of highly branched GHPU from tris-hydroxy-functionalized MWNTs, compared to GHPU from bis-hydroxy-functionalized MWNTs. TEM measurements for GHPUs clearly showed hyperbranched polymer-wrapped MWNT structures. Crystallization of hyperbranched polymers in GHPU was more developed than that of the HPNT nanocomposites, although MWNT-induced crystallization was observed for both the GHPU and HPNT samples. The hyperbranched polymer-grafting effect on MWNTs resulted in greater enhancement of the mechanical properties of GHPU at the same nanotube loading, compared to the case of HPNT nanocomposites. However, a too highly branched structure was found to lower the crystallization and mechanical properties of both the GHPUs and HPNTs. |
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Authors:
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Sibdas Singha Mahapatra; Santosh Kumar Yadav; Jae Whan Cho |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of nanoscience and nanotechnology Volume: 10 ISSN: 1533-4880 ISO Abbreviation: J Nanosci Nanotechnol Publication Date: 2010 Dec |
Date Detail:
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Created Date: 2010-12-02 Completed Date: 2010-12-30 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101088195 Medline TA: J Nanosci Nanotechnol Country: United States |
Other Details:
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Languages: eng Pagination: 8244-53 Citation Subset: - |
Affiliation:
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Department of Textile Engineering, Konkuk University, Seoul 143-701, Korea. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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