Hydrolyzed hexagonal boron nitride/polymer nanocomposites for transparent gas barrier film.
A flexible thin gas barrier film formed by layer-by-layer (LBL) assembly has been studied. We propose for the first time that hexagonal boron nitride (h-BN) can be used in LBL assembly. When dispersed in water through sonication-assisted hydrolysis, h-BN develops hydroxyl groups that electrostatically couple with the cationic polymer polydiallyldimethylammonium chloride (PDDA). This process produces hydroxyl-functional h-BN/PDDA nanocomposites. The nanocomposites exhibit well exfoliated and highly ordered h-BN nanosheets, which results in an extremely high visual clarity, with an average transmittance of 99% in the visible spectrum. Moreover, well aligned nanocomposites extend gas diffusion path that reduce water vapor transmission rate to 1.3 × 10-2g m-2d-1. The simple and fast LBL process demonstrated here can be applied in many gas barrier applications.
Display and Nanosystem Laboratory, College of Engineering, Korea University, Seoul 136-713, Republic of Korea.
Tan Young
TY
Kim
Eun Ho
EH
Song
Byung Hyun
BH
Kang
Se Jung
SJ
Kim
Yun-Hi
YH
Lee
Byeong-Kwon
BK
Ju