Superior Ductile and High-barrier Poly(lactic acid) Films by Constructing Oriented Nanocrystals as Efficient Reinforcement of Chain Entanglement Network and Promising Barrier Wall

Lin Zhou; Ping-Ping Xu; Shi-Hao Ni; Ling Xu; Hao Lin; Gan-Ji Zhong; Hua-Dong Huang; Zhong-Ming Li

doi:10.1007/s10118-022-2723-3

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Superior Ductile and High-barrier Poly(lactic acid) Films by Constructing Oriented Nanocrystals as Efficient Reinforcement of Chain Entanglement Network and Promising Barrier Wall

RESEARCH ARTICLE | Updated：2022-09-23

- Superior Ductile and High-barrier Poly(lactic acid) Films by Constructing Oriented Nanocrystals as Efficient Reinforcement of Chain Entanglement Network and Promising Barrier Wall
- Superior Ductile and High-barrier Poly(lactic acid) Films by Constructing Oriented Nanocrystals as Efficient Reinforcement of Chain Entanglement Network and Promising Barrier Wall
- Chinese Journal of Polymer Science 2022年40卷第10期页码：1201-1212
- Affiliations：
  
  College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China
- Author bio：
  
  ganji.zhong@scu.edu.cn (G.J. Z.)
  hdhuang@scu.edu.cn (H.D.H.)
- Funds：
  
  This work was financially supported by the National Key Research and Development Program of China (No. 2018YFB0704200), the National Natural Science Foundation of China (Nos. 51803140, 52033005, 51822305 and 21776186), the Science and Technology Department of Sichuan Province (No. 2018JY0584), the Postdoctoral Science Foundation of China (No. 2019M663496), and the State Key Laboratory of Polymer Materials Engineering (No. sklpme2021-4-03). We also thank Beamline 16B in Shanghai Synchrotron Radiation Facility (SSRF) for supporting the X-ray measurement.;Electronic supplementary information (ESI) is available free of charge in the online version of this article at http://doi.org/10.1007/s10118-022-2723-3.
- DOI：10.1007/s10118-022-2723-3
  中图分类号：
- 收稿：2022-01-25，
  
  修回：2022-3-19，
  
  录用：2022-3-23，
  
  网络首发：2022-06-22，
  
  纸质出版：2022-10-01
- Accepted：
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Zhou, L.; Xu, P. P.; Ni, S. H.; Xu, L.; Lin, H.; Zhong, G. J.; Huang, H. D.; Li, Z. M. Superior ductile and high-barrier poly(lactic acid) films by constructing oriented nanocrystals as efficient reinforcement of chain entanglement network and promising barrier wall. Chinese J. Polym. Sci. 2022, 40, 1201–1212

Lin Zhou, Ping-Ping Xu, Shi-Hao Ni, et al. Superior Ductile and High-barrier Poly(lactic acid) Films by Constructing Oriented Nanocrystals as Efficient Reinforcement of Chain Entanglement Network and Promising Barrier Wall[J]. Chinese Journal of Polymer Science, 2022, 40(10): 1201-1212.
Zhou, L.; Xu, P. P.; Ni, S. H.; Xu, L.; Lin, H.; Zhong, G. J.; Huang, H. D.; Li, Z. M. Superior ductile and high-barrier poly(lactic acid) films by constructing oriented nanocrystals as efficient reinforcement of chain entanglement network and promising barrier wall. Chinese J. Polym. Sci. 2022, 40, 1201–1212 DOI： 10.1007/s10118-022-2723-3.

Lin Zhou, Ping-Ping Xu, Shi-Hao Ni, et al. Superior Ductile and High-barrier Poly(lactic acid) Films by Constructing Oriented Nanocrystals as Efficient Reinforcement of Chain Entanglement Network and Promising Barrier Wall[J]. Chinese Journal of Polymer Science, 2022, 40(10): 1201-1212. DOI： 10.1007/s10118-022-2723-3.

摘要

Superior ductile

high-barrier and transparent poly(lactic acid) films were fabricated by biaxial stretching and constrained annealing

where the oriented nano-sized crystals could not only serve as “nano-barrier wall” to impede the penetration of gas molecules

but also strengthen amorphous chain entanglement network as physical crosslink to enhance ductility.

Abstract

It is a daunting task to develop a promising strategy at an industrial scale for simultaneously ameliorating ductility and gas barrier performance of poly(lactic acid) (PLA) films in the application of green packaging. In this work

biaxial stretching and constrained annealing were employed to prepare transparent PLA films with superior ductility and barrier properties. The oriented nano-sized crystals induced by biaxial stretching were developed into regular

form during constrained annealing

which could not only serve as “nano-barrier wall” to impede the diffusion and dissolution of gas molecules

but also strengthen amorphous chain entanglement network as physical crosslink to enhance ductility. As a result

the as-prepared PLA films exhibited an outstanding comprehensive performance with a low oxygen and water vapor permeability coefficient of 0.733×10

−14

·cm·cm

−2

·s

−1

·Pa

−1

and 3.82×10

−14

g·cm·cm

−2

·s

−1

·Pa

−1

respectively

outstanding ductility with elongation at break of 66.0%

high yield strength of 84.2 MPa

and good transparency of more than 80% at 550 nm. The new insight in the relationship between microscopic amorphous and crystalline structure and macroscopic performance is conducive to alleviating the intrinsic defects of brittle and insufficient barrier PLA films without the aid of any heterogenous modifiers

facilitating their widespread commercialization in the booming sustainable packaging market.

关键词

Keywords

references

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