EFFECTS OF ULTRAHIGH PRESSURES ON THE FORMATION AND PROPERTIES OF ORGANIC, SEMIORGANIC,AND INORGANIC MATERIALS.

摘要

It was found that superpressure alone could effect crosslinking of polybutadiene and apparent copolymerization of vinyl monomers to polybutadiene. In a somewhat similar fashion,methylmethacrylate was added to poly to give increasedmolecular-weight products. Polymerization of quinone to a relatively heat-stable material was effected by pressurization. Dimethyldicyanosilane was converted to an insoluble polymeric material by pressurizing to 105,000atmospheres at room temperature. Aluminosiloxanes having either acetylacetone or isopropoxide bonded to the aluminum,and methyl,ethyl,or phenyl groups on the silicon,were polymerized further and probably crosslinked by a combination of pressure and heat. The equilibrium composition of stoichiometric and nonstoichiometric iron monosulfide was shown to be pressure-temperature dependent. A new high-pressure form of aluminum phosphate,probably (A12(PO4)2 . A1(OH)3),was synthesized from hydrated aluminum phosphate and from the quartz form of A1PO4plus water. At pressures between 50,000and 110,000atmospheres,another new high-pressure form of iron phosphate was found. Zirconium pyrophosphate transforms to a new high-pressure polymorph between 45,000and 105,000atmospheres which is 15per cent denser than the ambient pressure form. (Author)