Figure 8. (A) Schematic
diagram of the hydrogen bond networks in the
(TA@LDH/PEO)n films; (B) Reorientation of LDH
nanosheets to perfect parallel alignment after stretching.
Whether upon repeated stretching or at a high stretching ratio, the
(TA@LDH/PEO)50 film keeps very good oxygen barrier
performance. Many factors make it have good oxygen resistance and
stretchable ability. LDH, TA and PEO all have plentiful hydrogen bonding
sites. When the film deformation is small, the H-bonding between TA@LDH
and PEO has much higher bond strength than van der Waals forces between
PEO chains, so the deformation is more likely to be a result of PEO
chain segment reorientation and extension rather than breaking hydrogen
bonds. In the process of further stretching, hydrogen bond damage and
regeneration of the film occur continuously (Figure 8A). In addition,
some LDH nanosheets that are not strictly parallel to the substrate will
reorient after stretching to improve the oxygen barrier capability of
the film (Figure 8B). Therefore, the (TA@LDH/PEO)50 film
simultaneously shows good barrier property and excellent stretchability.