Surface-decorated polymeric amphiphile porogens for the templation of a nanoporous materials

摘要

A nanoparticle which includes a multi-armed core and surface decoration which is attached to the core is prepared. A multi-armed core is provided by any of a number of possible routes, exemplary preferred routes being living anionic polymerization that is initiated by a reactive, functionalized anionic initiator and ∈-caprolactone polymerization of a bis-MPA dendrimer. The multi-armed core is preferably functionalized on some or all arms. A coupling reaction is then employed to bond surface decoration to one or more arms of the multi-armed core. The surface decoration is a small molecule or oligomer with a degree of polymerization less than 50, a preferred decoration being a PEG oligomer with degree of polymerization between 2 and 24. The nanoparticles (particle size ≦10 nm) are employed as sacrificial templating porogens to form porous dielectrics. The porogens are mixed with matrix precursors (e.g., methyl silsesquioxane resin), the matrix vitrifies, and the porogens are removed via burnout. Greater porosity reduces the dielectric constant k of the resulting dielectrics. The porous dielectrics are incorporated into integrated circuits as lower k alternatives to silicon dioxide.

主权项

1. A unimolecular amphiphilic nanoparticle, comprising:
a star polymer with a multi-armed core including at least 3 arms, wherein the multi-armed core comprises linear, dendritic, or hyperbranched aliphatic polyester segments; and surface decoration attached to said polyester segments, wherein the surface decoration is compatible with a matrix material, and wherein the surface decoration comprises polyethylene glycol or polypropylene glycol oligomers having a degree of polymerization less than 50.