材料科学
复合材料
石墨烯
极限抗拉强度
氧化物
纳米复合材料
纳米技术
冶金
作者
Wan Jiang,Yiming Liang,Yue Zhang,Zhihui Xie,Jin Zhou,Jian Kang,Ya Cao,Ming Xiang
出处
期刊:Polymer
[Elsevier]
日期:2022-11-01
卷期号:261: 125410-125410
被引量:4
标识
DOI:10.1016/j.polymer.2022.125410
摘要
Poly(lactic acid) (PLA) biaxially stretched films and graphene oxide-silica nanohybrids (GO-SiO2)/PLA nanocomposite biaxially stretched films (PGSi) with different stretching ratios were prepared by simultaneous biaxial stretching. The structural changes during biaxial stretching have a direct impact on the properties of the biaxially stretched films. Therefore, this work mainly studies the effect of the presence of filler (i.e., GO-SiO2) on the structural evolution of PLA during biaxial stretching, and establishes a bridge between structural changes and property changes. Through wide-angle X-ray diffraction (WAXD) and atomic force microscopy (AFM), it was found that GO-SiO2 facilitates the isotropic orientation of molecular chains during biaxial stretching and attenuates the degree of preferred orientation. As a result, the mechanical properties of PGSi biaxially oriented films are inferior to those of PLA biaxially oriented films. However, the synergistic effect of the excellent barrier property of GO-SiO2 and biaxial stretching make the barrier property of PGSi biaxially stretched films even better. In addition, when the tensile force is stronger than the interfacial force between GO-SiO2 and PLA, GO-SiO2 will precipitate out of PLA under the condition of a large stretching ratio, resulting in the generation of defects, which is not conducive to the improvement of PLA performance.
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