Nonaffine Deformations in ULK Dielectric Glasses

We show that there is a strong relation between the bulk modulus and elastic deformation characteristics of ULK organosilicate glasses. Our results indicate that the degree of deviation from homogeneous translation of the simulation cell deformation to molecular level is related to the constraints imposed by the precursor geometry and mean network connectivity of the structure. Characterization of this relation for a range of hybrid glasses that have different precursor geometries and network connectivity values is an important step towards establishing a robust molecular level design criteria to achieve desired mechanical properties of ULK glass materials.