Effect of defect-healing in graphene nanosheets on the mechanical properties of polyimide nanocomposites

Title
Effect of defect-healing in graphene nanosheets on the mechanical properties of polyimide nanocomposites
Authors
구본철유남호고문주남기호김경민이재관김호중
Keywords
graphene; Reduced graphene oxide; polyimide; Mechanical properties; Defect-healing
Issue Date
2017-10
Publisher
Carbon
Citation
VOL 122-621
Abstract
We report an effective method for fabricating graphene-based multifunctional polyimide (PI) nanocomposites via in situ polymerization, by the chemical defect-healing of pyridine functionalized reduced graphene oxide (H-Py-RGO). H-Py-RGO was successfully obtained through intramolecular cross-dehydrogenative coupling (ICDC). The mechanical properties, and thermal stability of the PI/H-Py-RGO nanocomposites were significantly improved compared with those of pristine PI film due to the restoration of the defect sites on the graphene surface, and the resulting high compatibility between the H-Py-RGO and the PI matrix. The tensile strength and modulus of the PI/H-Py-RGO nanocomposites with 1 wt% of added H-Py-RGO were increased by about 598% (883.5 MPa) and 535% (39.4 GPa) compared to those of pristine PI, respectively. Furthermore, 5 wt% H-Py-RGO loading resulted in a 91% reduction in the coefficient of thermal expansion (CTE) of the PI/H-Py-RGO nanocomposite.
URI
http://pubs.kist.re.kr/handle/201004/65904
ISSN
0008-6223
Appears in Collections:
KIST Publication > Article
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