The dispersion and orientation of two-dimensional (2D) inorganic nanoplatelets in polymers are technical challenges faced in polymer nanocomposite manufacturing. This work demonstrates an effective way to facilitate the dispersion and orientation of graphene oxide (GO) nanoplatelets in a polymer matrix through encapsulating the polymer within a nanoplatelet shell. Briefly, few-layered GO nanoplatelets encapsulated polystyrene (PS) microparticles were synthesized by a Pickering suspension polymerization method. The synthesis conditions, morphologies, and barrier properties of the GO encapsulated PS spheres and the melt-compressed films are characterized. The addition of salt induces flocculation of GO onto the surface of the styrene monomer droplet, resulting in the formation of a multilayered GO shell as well as the sedimenting of the PS/GO particles during polymerization. The obtained GO encapsulated PS microspheres were purified, dried, and melt-compressed to form composite films. The oxygen permeability (expressed as transmission rate) of the PS/GO composite film containing 2 wt % GO was 526.02 ± 55.78 cm³ m^–2 24 h^–1—a reduction of 96% relative to the PS control film and 34% lower than the solution mixed PS/GO composite film. This indicates that the encapsulated PS spheres act as an effective carrier to facilitate the dispersion of GO. The orientation was realized by the following melt-compression process, which creates tortuous pathways hindering the permeation of gases through the PS matrix.

中文翻译：

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氧化石墨烯包裹的聚苯乙烯微粒制备的阻气聚合物纳米复合薄膜

二维（2D）无机纳米片在聚合物中的分散和取向是聚合物纳米复合材料制造中面临的技术挑战。这项工作演示了一种有效的方法，可通过将聚合物封装在纳米片壳内来促进氧化石墨烯（GO）纳米片在聚合物基质中的分散和定向。简而言之，通过Pickering悬浮聚合法合成了几层GO纳米片封装的聚苯乙烯（PS）微粒。表征了GO封装的PS球和熔体压缩膜的合成条件，形貌和阻挡性能。盐的添加会导致GO絮凝到苯乙烯单体液滴的表面，导致形成多层GO壳以及聚合过程中PS / GO颗粒的沉降。将获得的GO包封的PS微球纯化，干燥并熔融压缩以形成复合膜。包含2 wt％的GO的PS / GO复合膜的透氧性（以透射率表示）为526.02±55.78 cm³ m ^–2 24 h ^–1 –相对于PS对照膜减少96％，比溶液混合PS / GO复合膜减少34％。这表明封装的PS球充当促进GO分散的有效载体。通过以下的熔体压缩过程实现了取向，该过程产生了曲折的通道，阻碍了气体透过PS基质的渗透。