The methyl groups in the methyl silicone resin are all replaced by the phenyl groups to obtain the phenyl silicone resin, which is made from the hydrolysis of phenyl trichloro (or trialkoxy) silane condensation. It is a kind of trapezoidal polymer which is hydrolyzed by phenyl trichlorosilane under certain conditions and then rearranged by equilibrium reaction.
Silicon ladder polymer soluble in benzene, tetrahydrofuran, methylene chloride and other solvents, can flow into colorless, transparent, tough film, this polymer is more superior than ordinary organic silicon resin has damp and hot resistance, in the steam heat aging resistance, as well as in the air, almost tensile strength is about twice as many ordinary organic silicon resin, can reach 27.5 41.2 MPa, The most outstanding property of silicon ladder polymer is its heat resistance. It loses weight only when heated to 525℃ in air. The chemical structure defects of this trapezoidal polymer, such as uncondensed hydroxyl groups, branching, crosslinking, etc. have a great influence on the performance.