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首页> 外文期刊>Journal of Applied Polymer Science >Relationship between microstructure of lamellar graphene sheets and properties of polyimide/graphene nanocomposites film under different imidization stages
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Relationship between microstructure of lamellar graphene sheets and properties of polyimide/graphene nanocomposites film under different imidization stages

机译：不同酰亚胺化阶段层状石墨烯片的微观结构与聚酰亚胺/石墨烯纳米复合薄膜性能的关系

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摘要

Herein, polyimide/graphene sheets (PI/GS) nanocomposite films with different GS distribution structures have been successfully obtained by controlling the imidization degrees, and the effect of the lamellar structure on the properties of PI film has been investigated. The results show that GS are gradually parallel to the surface of PI nanocomposite film with the increase of the imidization temperature, and 150 degrees C is the critical temperature, where the imidization rate is the fastest and the lamellar structure begins to form. Furthermore, with the drying temperature increasing, the corresponding thermal, electrical and mechanical properties of PI/GS nanocomposite films are significantly improved compared with that of pure PI films, which are ascribed to both the higher imidization degree and the lamellar GS structure. It is noteworthy that the formation process of the lamellar structure at different imidization stages can be directly observed by scanning electron microscope. Based on these results, a model has been proposed to explain the relationship between the lamellar structure and properties of PI composite film under different imidization stages, and the confinement of the thickness may be the most important factor for the formation of lamellar GS structure. (c) 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43575.
机译：通过控制酰亚胺化程度，成功地获得了具有不同GS分布结构的聚酰亚胺/石墨烯片（PI / GS）纳米复合薄膜，并研究了层状结构对PI薄膜性能的影响。结果表明，随着酰亚胺化温度的升高，GS逐渐与PI纳米复合膜的表面平行，临界温度为150℃，其中酰亚胺化速度最快，层状结构开始形成。此外，随着干燥温度的升高，与纯PI膜相比，PI / GS纳米复合膜的相应热，电和机械性能得到显着改善，这归因于较高的酰亚胺化度和层状GS结构。值得注意的是，可以通过扫描电子显微镜直接观察在不同的酰亚胺化阶段的层状结构的形成过程。基于这些结果，提出了一个模型来解释PI复合膜在不同酰亚胺化阶段的层状结构与性能之间的关系，而厚度的限制可能是形成层状GS结构的最重要因素。 （c）2016 Wiley Periodicals，Inc. J. Appl。 Polym。科学2016，133，43575。

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