Significantly enhanced and precisely modeled thermal conductivity in polyimide nanocomposites with chemically modified graphene: Via in situ polymerization and electrospinning-hot press technology

Yongqiang Guo, Genjiu Xu, Xutong Yang, Kunpeng Ruan, Tengbo Ma, Qiuyu Zhang, Junwei Gu, Yalan Wu, Hu Liu, Zhanhu Guo

Research output: Contribution to journalArticlepeer-review

402 Scopus citations

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 (Tg) and heat resistance index (THRI) 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 Tg and THRI 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.

Original languageEnglish
Pages (from-to)3004-3015
Number of pages12
JournalJournal of Materials Chemistry C
Volume6
Issue number12
DOIs
StatePublished - 2018

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