Negative normal stress differences in graphene/polycarbonate composites

作者：Jun Sang Il; Lee Heon Sang^*

来源：Applied Physics Letters, 2012, 100(16): 164108.

DOI：10.1063/1.4704929

• Brownian motion
• elastic moduli
• graphene
• nanocomposites
• polymer gels
• polymer melts
• shear deformation
• shear flow

We measured the negative normal stress differences in graphene (0.5 wt. %)/polycarbonate composites during shear flow. The Peclet number in graphene/PC melt is estimated to be 10(5) similar to 10(8), indicating the graphene sheets are non-Brownian. The negative normal stress is related with the deformations of gel-like structure of graphene sheets in PC. The storage modulus of graphene/PC composite melts approaches to a solid-like plateau in the terminal region at low concentration of 0.05 similar to 0.70 wt. % graphene.

• 出版日期2012-4-16