期刊
COMPOSITES PART B-ENGINEERING
卷 222, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2021.109048
关键词
Barrier properties; Ductility; Biaxial stretching; Constrained annealing
资金
- National Key Research and Development Program of China [2018YFB0704200]
- National Natural Science Foundation of China [51803140, 52033005, 51822305, 21776186]
- Science and Technology Department of Sichuan Province [2018JY0584, 2019YJ0043]
- Fundamental Research Funds for the Central Universities [sklpme2019-2-06, yj201795]
The study successfully enhanced the barrier properties and ductility of PLA nanocomposite films by manipulating the amorphous chain entanglement network of PLA and constructing dual barrier walls of highly aligned GONSs and well-defined PLA crystals. This synergetic structure showed excellent comprehensive ability in improving the intrinsic drawbacks of PLA films, making them suitable for packaging industry applications.
It is a great challenge to develop a feasible strategy for reconciling barrier performance and mechanical ductility of environmentally friendly poly(lactic acid) (PLA) in the application of packaging industry. In the current study, the combination of manipulating the amorphous chain entanglement network of PLA and constructing dual barrier walls of highly aligned GONSs and well-defined PLA crystals simultaneously enhanced barrier properties and ductility of PLA nanocomposite films via biaxial stretching-constrained annealing method. The intense extensional field during biaxial stretching induced highly aligned GONSs as the first barrier wall and regulated the amorphous chain entanglement network. Constrained annealing promoted the growth and perfection of PLA crystals as the second effective barrier wall and strengthened amorphous chain entanglement network to some extent. More interestingly, GONSs were first verified as contributors to stabilize the enhanced amorphous chain entanglement network of PLA and benefited for the mechanical ductility of PLA nanocomposite films. As a result, this synergetic structure manifested excellent comprehensive ability in ameliorating the intrinsic drawbacks of brittle and poor barrier PLA films, exhibiting low oxygen permeability coefficient of 0.712 x 10-14 cm3 cm cm- 2 s- 1 Pa- 1, excellent ductility with elongation at break of 147.8%, high yield strength of 83.1 MPa and good dimensional stability with deformation ratio of as low as 3%. The as-prepared PLA nanocomposite films with excellent comprehensive properties hold great potential prospects in the application of packaging industry. The methodology proposed here opens up a new avenue to fabricate environmentally friendly PLA films for promoting the sustainable development of packaging industry.
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