TY - JOUR
T1 - Significantly enhanced and precisely modeled thermal conductivity in polyimide nanocomposites with chemically modified graphene
T2 - Via in situ polymerization and electrospinning-hot press technology
AU - Guo, Yongqiang
AU - Xu, Genjiu
AU - Yang, Xutong
AU - Ruan, Kunpeng
AU - Ma, Tengbo
AU - Zhang, Qiuyu
AU - Gu, Junwei
AU - Wu, Yalan
AU - Liu, Hu
AU - Guo, Zhanhu
N1 - Publisher Copyright:
© 2018 The Royal Society of Chemistry.
PY - 2018
Y1 - 2018
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85044283568&partnerID=8YFLogxK
U2 - 10.1039/c8tc00452h
DO - 10.1039/c8tc00452h
M3 - 文章
AN - SCOPUS:85044283568
SN - 2050-7534
VL - 6
SP - 3004
EP - 3015
JO - Journal of Materials Chemistry C
JF - Journal of Materials Chemistry C
IS - 12
ER -