Hybrid Polymer Grafted Nanoparticle Composites for Blast-Induced Shock-Wave Mitigation

Abstract

In this work, we seek to create elastomeric nano composites for blast-induced shock-wave management. There are three main elements of nano composite structure, namely the particle (hard), the matrix (soft), and the interfacial chemistry connecting these two. For compositing, the blending approach allows for superb control of particle size, shape, and density; however, the hard/soft interface is typically weak for simple blends. Here we develop hybrid polymer grafted nanoparticle composites, which allow for tuning of the interface to overcome this deficiency. These nanoparticles have tethered polymer chains that can interact with their surrounding environment and provide a method to control enhanced nano-composites. We have established a “grow-from” method to covalently link polymers of variable molecular weight and chemical functionality to the surface of silica nanoparticles. The resulting nano-composite consists of homogeneously dispersed silica nanoparticles with tethered polymer chains within a bulk elastomeric matrix. Such a composite can manage shock-wave energy via dissipation and resonant trapping. The work described here is part of an ongoing effort to develop and verify rules and tools for creating elastomeric composites with optimally designed compositions and characteristics to manage blast-induced shock-wave energy.