1 research outputs found
Hydroxyl and Amino Bifunctionalized Boron Nitride Nanosheets for High-Strength and Thermoconductive Composite Films
Boron
nitride nanosheets (BNNSs) have attracted more and more attention
in the field of thermal management due to their excellent thermal
and electrical properties. However, the low dispersity and low production
yield are still a great baffle for its application. Herein, high-performance
hydroxyl and amino bifunctionalized BNNSs (HA-BNNSs) were successfully
prepared by the citric acid-assisted ball milling one-step method.
Based on the additional friction provided by citric acid during ball
milling, the aspect ratio of HA-BNNSs was up to 499 and the production
yield was as high as 89.7%. Simultaneously, arising from the high
functionalization rate, the HA-BNNSs show excellent dispersity in
a variety of polar solvents, particularly in 50% aqueous ethanol solution.
The dispersibility of HA-BNNSs was much improved to 39.8 mg/mL. Based
on the good dispersibility of HA-BNNSs and strong interface interactions
between HA-BNNSs and the matrix, HA-BNNSs have been introduced to
aramid nanofibers (ANFs) to fabricate layered HA-BNNSs/ANF composite
films for thermal management applications. In comparison with the
pure BNNSs/ANF, the HA-BNNSS/ANF composite exhibits improved mechanical
strength (85.6–175.6 MPa) and better thermal conductivity (8–39.5
W/m·K) at a relatively low filler content (≤50%). In summary,
benefiting from the bifunctional group, improved dispersibility, and
high aspect ratio, the HA-BNNSs have great application potential in
the fields of composite reinforcement, drug delivery, and photocatalysis