Significantly enhanced and precisely modeled thermal conductivity in polyimide nanocomposites with chemically modified graphene via in situ polymerization and electrospinning-hot press technology. Issue 12 (8th March 2018)

• Record Type: Journal Article
• Authors: Guo, Yongqiang; Xu, Genjiu; Yang, Xutong; Ruan, Kunpeng; Ma, Tengbo; Zhang, Qiuyu; Gu, Junwei; Wu, Yalan; Liu, Hu; Guo, Zhanhu
• Is Part Of: Journal of materials chemistry. Volume 6:Issue 12(2018)
• Page Start: 3004
• Page End: 3015
• Publication Date: 2018-03-08
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c8tc00452h
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : Significantly improved thermal conductivities and a more accurate thermal conductivity model were achieved. Abstract : Both aminopropylisobutyl polyhedral oligomeric silsesquioxane (NH2 -POSS) and hydrazine monohydrate were utilized to functionalize graphene oxide (GO), and to obtain chemically modified graphene (CMG), which was then used for preparing thermally conductive CMG/polyimide (CMG/PI) nanocomposites via a sequential in situ polymerization and electrospinning-hot press technology. NH2 -POSS molecules were grafted on the GO surface, and CMG was obtained by the reaction between NH2 -POSS and GO. The thermal conductivity coefficient ( λ ), glass transition temperature ( T g ) and heat resistance index ( T HRI ) of the prepared CMG/PI nanocomposites were all increased with increasing the CMG loading. The λ value of the CMG/PI nanocomposites with 5 wt% CMG was significantly improved to 1.05 W m −1 K −1, about 4 times higher than that of the pristine PI matrix (0.28 W m −1 K −1 ). The corresponding T g and T HRI values were also increased to 213.0 and 282.3 °C, respectively. Moreover, an improved thermal conductivity model was proposed and predicted the λ values of the nanocomposites more precisely than those obtained from the typical Maxwell, Russell and Bruggemen classical models.