| RESEARCH PAPER |
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| Oxygen Barrier Properties of LDHs/PCL Nanocomposite Films Synthesized by In-situ Graft Polymerization |
| MAO Long1,2, LIU Yuejun1,2, BAI Yongkang2, LIU Xiaochao1
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1 Key Laboratory of Advanced Packaging Materials and Technology of Hunan Province, Hunan University of Technology, Zhuzhou 412007;
2 School of Materials Science and Engineering, Xiamen University of Technology, Xiamen 361024 |
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Abstract In this work, layered double hydroxides-g-poly(ε-caprolactone) (LDHs-g-PCL) were prepared by in-situ ring-opening polymerization at low LDHs loadings. Then LDHs/PCL nanocomposites were prepared by blending LDHs-g-PCL and pure PCL via solution casting method, and the nanocomposites' chemical structures were investigated. And crystallization behavior, mechanical properties and barrier properties of nanocomposites were also deeply studied. It was shown that LDHs-g-PCL were prepared successfully by in-situ polymerization. And results showed that with the increase of LDHs-g-PCL in LDHs/PCL nanocomposites, the crystallization of LDHs/PCL nanocomposites gradually increased. However, the efficiency of heterogeneous nucleation of LDHs-g-PCL decreased to a certain extent. Tensile strength and elongation at break of LDHs/PCL nanocomposites containing 10% (mass fraction) LDHs-g-PCL increased by 31% and 37%, respectively. Compared to pure PCL, the O2 permeability of LDHs/PCL nanocomposites containing 50% (mass fraction) LDHs-g-PCL was reduced by nearly 78%. And the reduction of the O2 permeability arised from the longer diffusion path that the pentrants must travel in the presence of LDHs. The relative permeability model of nanocomposites based on Nielsen's theory was optimized. According to the optimized model, the key parameters to improve the barrier properties of LDHs/PCL nanocomposites are not only the barrier effect of the LDHs (or LDHs-g-PCL) but also the bulk effect that they develop in the polymer matrix.
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Published: 08 May 2018
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2017, Vol. 31 
