Type

Journal Article

Authors

Peter May
Umar Khan
Jonathan Coleman
Arlene O'Neill

Subjects

Physics

Topics
boron nitride mechanical properties exfoliated nanosheets composite films helium ion microscopy nanoscience materials polymer composites graphene filled composites

Polymer reinforcement using liquid-exfoliated boron nitride nanosheets (2013)

Abstract 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, ?B, of these composites to increase linearly with volume fraction, Vf, up to Vf ~ 0.1 vol% BN before falling off. The rates of increase are extremely high; dY/dVf = 670 GPa and d?B/dVf = 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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Full list of authors on original publication

Peter May, Umar Khan, Jonathan Coleman, Arlene O'Neill

Experts in our system

1
Peter May
Trinity College Dublin
Total Publications: 27
 
2
Umar Khan
Trinity College Dublin
Total Publications: 37
 
3
Jonathan Coleman
Trinity College Dublin
Total Publications: 217
 
4
Arlene O'Neill
Trinity College Dublin
Total Publications: 25