Nanomechanics of Micron-Sized Polymer Particles
The field of nanomaterials has witnessed remarkable progress in Norway as well as in the world, with many different types of new materials being synthesized for a potentially wide spectrum of applications. Before being transferred to industrial applications, it is essential to understand and characterize the mechanical properties of these new materials at nanoscale. This talk will focus on the mechanical characterization of polymer particles. Recently Norway has sparked a renewed interest in exploiting mono-sized particle (500nm- 10μm in diameter) technology for use in Anisotropic Conductive Adhesives as well as Liquid Crystal Displays. In these applications, the characterization, analysis and control of mechanical properties of the particles are of crucial importance. Due to temperature and mechanically induced loading, various failure mechanisms such as deformation, creep, cracking and fracture can occur during production and service. A flat-punch based nanoindentation method for testing individual particles has been recently developed by the authors for testing the mechanical properties of polymer particles with deformation up to 80％. A series of polymer particles with various diameters has been tested. The polymer particles show peculiar rate-dependent, yielding, hardening and fracture behaviour. It has been found that for same deformation rate the resulting contact stress-strain curve is strongly dependent on particle diameter, and traditional material models are of limited accuracy. Specific constitutive models that include viscoelastic response, size effect, large deformation, and nanoscale adhesion are greatly needed to understand the mechanical behaviour of polymer particles.
Zhiliang Zhang Jianying He Helge Kristiansen
NTNU Nanomechanical Lab,Norwegian University of Science and Technology (NTNU),(挪威科技大学),Trondheim,Nor Conpart As,Kjeller,Norway
国际会议
成都
英文
2007-11-19（万方平台首次上网日期，不代表论文的发表时间）