Facile preparation of poly(vinyl alcohol)/graphene oxide nanocomposites and their foaming behavior in supercritical carbon dioxide
Facile preparation of poly(vinyl alcohol)/graphene oxide nanocomposites and their foaming behavior in supercritical carbon dioxide
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聚(乙烯醇)/氧化石墨烯纳米复合材料的简便制备及其在超临界二氧化碳中的发泡行为
DOI：
10.1016/j.compositesa.2018.01.032
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发表时间：
2018-04-01
影响因子：
8.7
通讯作者：
Duan, Wenfeng
中科院分区：
文献类型：
--
作者：
Liu, Pengju;Chen, Wenhua;Duan, Wenfeng
在本研究中，我们采用超临界流体发泡技术制备了一种基于聚乙烯醇（PVA）和氧化石墨烯（GO）的新型聚合物纳米复合泡沫材料。以水为良性溶剂，在温和超声的辅助下，将氧化石墨烯薄片充分剥落并均匀分散到PVA基体中，然后经过热处理得到PVA/GO纳米复合材料。结果表明，与纯PVA相比，分散良好的PVA/GO纳米复合材料的机械强度有显著提高。在随后的发泡过程中，氧化石墨烯片作为细胞壁的增强元素，在细胞生长过程中起到稳定细胞结构的有效作用。由于氧化石墨烯片的非均质成核，使得PVA/GO纳米复合泡沫具有更小的孔尺寸和更大的孔密度，从而显著提高了PVA/GO纳米复合泡沫的抗压强度。
In this study, we presented a novel polymer nanocomposite foam based on poly(vinyl alcohol) (PVA) and graphene oxide (GO) prepared via the supercritical fluid foaming technology. By using water as the benign solvent, GO sheets were fully exfoliated and homogeneously dispersed into PVA matrix with the assistance of mild sonication, and then the PVA/GO nanocomposite was obtained after thermal processing. The results indicated that the well-dispersed PVA/GO nanocomposite showed significantly improved mechanical strength, compared with neat PVA. In subsequent foaming procedure, GO sheets served as the reinforcing element for cell walls and played an effective role in stabilizing the cellular structure during cell growth. Benefiting from the heterogeneous nucleation of GO sheets, the nanocomposite foams exhibited smaller cell size and larger cell density, thus a remarkable enhancement in compressive strength was obtained for PVA/GO nanocomposite foams.