After the polymer is carbonized in an inert atmosphere or vacuum thermal decomposition, who can break down into low molecular weight have become part of the structure of a gas escape, the remaining solid consisting mainly of carbon. Either in the form of amorphous carbon, or it may be graphitized carbon. Structure and properties of carbon materials is determined by the structure of the intermediate product of pyrolysis characteristics and conditions of carbonization and graphitization polymer, control conditions can be obtained in a scanning electron microscope can not be found carbonized film cracking and pinholes.
Carbonized polyimide is an electrically conductive material can be used for the carbon electrodes, biomedical devices, low-temperature heating element, a pattern of conductive traces, electronic shielding, and radiation detection element may be a gas. The thickness of the polyimide is greater than the carbon material of the carbon material obtained from the phenol. Cermet for purifying the air filter has been manufactured with carbonized polyimide. This filter has a stable permeability and high degree of purification. Polyimide carbonized material is also used as a lubricant, above 300 ℃ has a low coefficient of friction. This material even in a mixture of sulfuric acid and nitric acid at boiling point in the middle of the KOH solution and boiling is stable.
In the past used to produce carbonized polymeric material is a phenolic resin, the drawback is low carbonization yield after pyrolysis, also brought a large shrinkage. Also not much variety, limited thickness, brittleness and unpredictable presence in airtight product defects also makes use of such a resin is limited.