Monomer and Polyimide Production in the Search for Radiation Shielding for Space Exploration

Current forms of radiation shielding fail to adequately protect either equipment or personnel during extended space travel beyond the Van Allen radiation belts. Radiation such as galactic cosmic radiation, neutrons, and high energy electromagnetic radiation is of great concern and must be taken into account in the planning of any future mission. In light of this, it is necessary to produce new lightweight shielding materials which are both structurally functional and effective in blocking these dangerous forms of radiation. Polyimides have excellent thermal and mechanical stability and this stability is increased when the aromatic content of the backbone is increased. In addition, methods for monomer synthesis provide a convenient route for increasing hydrogen content in the monomer and thereby increasing the polymer’s radiation shielding capabilities. This research has concentrated primarily on the synthesis of bisphenol monomers as well as subsequent steps toward polyimidization. Tungsten additives and their effects on thermal and mechanical properties were also explored. These syntheses as well as future research into similar compounds will advance the search for more effective shielding materials.