| Polymer reinforcement using liquid-exfoliated boron nitride nanosheets. | |
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MedLine Citation:
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PMID: 23203296 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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We have exfoliated hexagonal boron nitride by ultrasonication in solutions of polyvinylalcohol in water. The resultant nanosheets are sterically stabilised by adsorbed polymer chains. Centrifugation-based size-selection was used to give dispersions of nanosheets with aspect ratio (length/thickness) of ∼1400. Such dispersions can be used to produce polyvinylalcohol-BN composite films. Helium ion microscopy of fracture surfaces shows the nanosheets to be well dispersed and the composites to fail by pull-out. We find both modulus, Y, and strength, σ(B), of these composites to increase linearly with volume fraction, V(f), up to V(f) ∼ 0.1 vol% BN before falling off. The rates of increase are extremely high; dY/dV(f) = 670 GPa and dσ(B)/dV(f) = 47 GPa. The former value matches theory based on continuum mechanics while the latter value is consistent with remarkably high polymer-filler interfacial strength. However, because the mechanical properties increase over such a narrow volume fraction range, the maximum values of both modulus and strength are only ∼40% higher than the pure polymer. This phenomenon has also been observed for graphene-filled composites and represents a serious hurdle to the production of high performance polymer-nanosheet composites. |
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Authors:
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Umar Khan; Peter May; Arlene O'Neill; Alan P Bell; Elodie Boussac; Arnaud Martin; James Semple; Jonathan N Coleman |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-12-3 |
Journal Detail:
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Title: Nanoscale Volume: - ISSN: 2040-3372 ISO Abbreviation: Nanoscale Publication Date: 2012 Dec |
Date Detail:
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Created Date: 2012-12-3 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101525249 Medline TA: Nanoscale Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN) & School of Physics, Trinity College Dublin, Dublin 2, Ireland. colemaj@tcd.ie. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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