论文标题
辅助插入剂对扩展的石墨/聚醚酰亚胺复合材料的热导率的比较研究
A comparative study of auxiliary intercalating agents on thermal conductivity of expanded graphite/polyetherimide composite
论文作者
论文摘要
在这项工作中，我们全面研究了辅助互化剂对扩展石墨（EG）聚合物复合材料的热导率的影响。我们报告了通过将EG与EG与过氧化氢（H2O2）一起用作辅助插入剂，以10 wt％组成（k k k k k k k k k k k k k k k k k k k = k = 9.5 wm-1k-1），多醚/石墨烯纳米复合材料的导热率（k = 9.5 wm-1k-1）的超高增强功率（k = 9.5 wm-1k-1），以10 wt％组成（纯Pure polyetherimide〜0.23 wm-1k-1 k k k）。发现该超高的热导率值是由于整个复合材料的EG介导的相互连接的石墨烯网络引起的，建立了一个渗透性环境，该环境可以在复合材料中实现高效的热传输。还使用氯酸钠（NaClo3）作为辅助插入剂进行了比较研究。在10 wt％的组成下，发现NaClo3插入的EG导致k复合材料的2190％较小增强。进行详细的表征是为了阐明这一优势，表明过氧化氢主要导致EG内石墨烯片的边缘氧化，使基础平面完整，从而保持了超高的平面内电导率约为2000 wm-1k-1。另一方面，氯酸钠导致了更高程度的氧化，在石墨烯的基础平面上有大量的氧基团，从而大大降低了其平面内导热率。制备的H2O2的热扩散率，例如测量的纸为9.5 mm2/s，而NaClo3病例的热扩散率为6.7 mm2/s，因此直接证实了H2O2对石墨烯本身的H2O2的有益影响。这项研究是第一个解决互化剂对扩展的石墨/聚合物复合材料K的作用的作用，并导致发现H2O2是实现超高热导率值的有效插入剂。
In this work, we have comprehensively studied the effect of auxiliary intercalating agents on the thermal conductivity of expanded graphite (EG) polymer composites. We report an ultra-high enhancement of 4030% in thermal conductivity of polyetherimide/graphene nanocomposite (k = 9.5 Wm-1K-1) prepared through the use of EG with hydrogen peroxide (H2O2) as an auxiliary intercalating agent at 10 wt% compositions (k of pure polyetherimide ~ 0.23 Wm-1K-1). This ultra-high thermal conductivity value is found to be due to an EG-mediated interconnected graphene network throughout the composite, establishing a percolative environment that enables highly efficient thermal transport in the composite. Comparative studies were also performed using sodium chlorate (NaClO3) as an auxiliary intercalating agent. At 10 wt% composition, NaClO3 intercalated EG was found to lead to a smaller enhancement of 2190% in k of composite. Detailed characterization performed to elucidate this advantage, revealed that hydrogen peroxide led to primarily edge oxidation of graphene sheets within EG, leaving the basal plane intact, thus preserving the ultra-high in-plane thermal conductivity of ~ 2000 Wm-1K-1. Sodium chlorate, on the other hand, led to a higher degree of oxidation, with a large number of oxygen groups on the basal plane of graphene, dramatically lowering its in-plane thermal conductivity. Thermal diffusivity of H2O2 prepared EG paper was measured to be 9.5 mm2/s while that of NaClO3 case was measured to be 6.7 mm2/s, thus directly confirming the beneficial impact of H2O2 on k of graphene itself. This study is the first to address the role of intercalating agents on k of expanded graphite/polymer composites and has led to the discovery of H2O2 as an effective intercalating agent for achieving ultra-high thermal conductivity values.
