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Sep 13, 2018
Polyimide carbonized product
After the polymer is carbonized in an inertatmosphere or vacuum thermal decomposition, who can break down into lowmolecular weight have become part of the structure of a gas escape, theremaining solid consisting mainly of carbon. Either in the form of amorphouscarbon, or it may be graphitized carbon. Structure and properties of carbonmaterials is determined by the structure of the intermediate product of pyrolysischaracteristics and conditions of carbonization and graphitization polymer, controlconditions can be obtained in a scanning electron microscope can not be foundcarbonized film cracking and pinholes.
Carbonized polyimide is an electricallyconductive material can be used for the carbon electrodes, biomedical devices,low-temperature heating element, a pattern of conductive traces, electronicshielding, and radiation detection element may be a gas. The thickness of thepolyimide is greater than the carbon material of the carbon material obtainedfrom the phenol. Cermet for purifying the air filter has been manufactured withcarbonized polyimide. This filter has a stable permeability and high degree ofpurification. Polyimide carbonized material is also used as a lubricant, above300 ℃ has a low coefficient of friction. This material even in a mixtureof sulfuric acid and nitric acid at boiling point in the middle of the KOHsolution and boiling is stable.
In the past used to produce carbonizedpolymeric material is a phenolic resin, the drawback is low carbonization yieldafter pyrolysis, also brought a large shrinkage. Also not much variety, limitedthickness, brittleness and unpredictable presence in airtight product defectsalso makes use of such a resin is limited.