ie6b02168_si_001.pdf (200.34 kB)
Highly Efficient “Composite Barrier Wall” Consisting of Concentrated Graphene Oxide Nanosheets and Impermeable Crystalline Structure for Poly(lactic acid) Nanocomposite Films
journal contribution
posted on 2016-08-19, 00:00 authored by Hua-Dong Huang, Sheng-Yang Zhou, Dong Zhou, Peng-Gang Ren, Jia-Zhuang Xu, Xu Ji, Zhong-Ming LiPoly(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 O2 permeability
of PLA nanocomposite film at a GONS loading of 1.0 wt % as low as
0.211 × 10–14 cm3 cm cm–2 s–1 Pa–1, 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.
History
Usage metrics
Categories
Keywords
PLA nanocomposite filmimpermeable PLA lamellaePLA spherulitesO 2 permeabilityGONS regionPLA filmprocessing techniquesgas barrier performanceα- nucleating agentgraphene oxide nanosheetsspherulite morphologynucleating abilityConcentrated Graphene Oxide Nanosheetshigh-barrier polymer packaging materialsbarrier performanceImpermeable Crystalline StructureGONS loadingpackaging materialcrystallization rate
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC