10.1021/acs.iecr.6b02168.s001
Hua-Dong Huang
Hua-Dong
Huang
Sheng-Yang Zhou
Sheng-Yang
Zhou
Dong Zhou
Dong
Zhou
Peng-Gang Ren
Peng-Gang
Ren
Jia-Zhuang Xu
Jia-Zhuang
Xu
Xu Ji
Xu
Ji
Zhong-Ming Li
Zhong-Ming
Li
Highly Efficient “Composite Barrier Wall”
Consisting of Concentrated Graphene Oxide Nanosheets and Impermeable
Crystalline Structure for Poly(lactic acid) Nanocomposite Films
American Chemical Society
2016
PLA nanocomposite film
impermeable PLA lamellae
PLA spherulites
O 2 permeability
GONS region
PLA film
processing techniques
gas barrier performance
α- nucleating agent
graphene oxide nanosheets
spherulite morphology
nucleating ability
Concentrated Graphene Oxide Nanosheets
high-barrier polymer packaging materials
barrier performance
Impermeable Crystalline Structure
GONS loading
packaging material
crystallization rate
2016-08-19 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Highly_Efficient_Composite_Barrier_Wall_Consisting_of_Concentrated_Graphene_Oxide_Nanosheets_and_Impermeable_Crystalline_Structure_for_Poly_lactic_acid_Nanocomposite_Films/3776676
Poly(lactic acid) (PLA), a promising
sustainable packaging material,
suffers from intrinsic poor gas barrier performance partly due to
its innate defect of relatively low crystallization rate. In the present
study, taking advantage of the excellent impermeability and heterogeneous
nucleating ability of graphene oxide nanosheets (GONSs), the crystalline
structure of PLA nanocomposite film was manipulated using processing
techniques. We revealed that GONSs were the α-nucleating agent
for PLA, inducing typical spherulite morphology. More interestingly,
two-dimensional small-angle scattering characterization confirmed
that GONSs were preferentially dispersed in the amorphous phase between
PLA spherulites, achieving a concentrated GONS region. As a consequence,
the “composite barrier wall” consisting of concentrated
GONSs and impermeable PLA lamellae gave rise to O<sub>2</sub> permeability
of PLA nanocomposite film at a GONS loading of 1.0 wt % as low as
0.211 × 10<sup>–14</sup> cm<sup>3</sup> cm cm<sup>–2</sup> s<sup>–1</sup> Pa<sup>–1</sup>, reduced by ∼89.9% relative to neat amorphous PLA film. These
results presented here afford new insight into the contribution of
GONSs and their induced crystalline structure to the significantly
enhanced barrier performance, which may also open up a promising avenue
for design and fabrication of high-barrier polymer packaging materials.