The traditional way to make PBO its full name is polybenzoxazole involves the use of polyphosphoric acid PPA as both a catalyst for necessary chemical reactions and as a solvent. PPA is a strong, highly corrosive acid and scientists have pinpointed it as the source of PBO degradation. That degradation has led to the recall of PBO-based body armor in the past.
Catalyzing the reactions with nanoparticles would also require less energy and researchers can perform the process using renewable formic acid as a hydrogen source. All of that makes the production process greener. Up to now, however, researchers have largely used composite nanoparticle catalysts to make only small organic molecules. Scientists did not know whether a composite catalyst, which in this case the researchers made from particles of gold and palladium alloys, could be useful in catalyzing the controlled growth of polymer chains.
Tests showed that the PBO polymers researchers made were more resistant to degradation than commercially available Zylon. Particles around 8-nanometers in size produced a reaction speed that maximized the molecular weight of the PBO polymers.
To find out if the PBO would indeed resist degradation, the team worked with engineers to perform mechanical testing. At one time, this was a product pretty much only used in government installations. Share this Post. The five most common types of bulletproof glass are: traditional laminated glass insulated ballistic glass acrylic polycarbonate glass-clad polycarbonate.
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