even at high temperature. Is there any relation with homopolymer/co-polymer?
Char residue is carbon or carbonaceous material that cannot be further dissociated into smaller volatile fragments and remain there at the highest temperature of the TGA analysis.
Char residue is carbon or carbonaceous material that cannot be further dissociated into smaller volatile fragments and remain there at the highest temperature of the TGA analysis.
Generally, the polymers with aromatic rings tends to yield some char residue which is stable up to 600 °C in nitrogen atmosphere. As a rule of thumb, one can say more aromatic rings leads to more char residue.
Mostly presence of aromatic rings yield char yield in TGA, mostly under nitrogen gas as residual carbon can not be decomposed. Further, presence of inorganic matters yield chars and may form the basis of quantitative estimation.
Try running TGA under air atmosphere, the organic molecules will burn and leave behind just ashes of inorganics. When TGA is run under inert nitrogen atmosphere, pyrolysis reaction will take place. It drives away all atoms but carbon. Hence the residue.
If I have correctly understood your question/remark; high temperature residues will be generated regardless of polymer being homo or co! Of course the temperature must be high enough or the time of exposure must be long enough to generate such chemical changes in the polymer.
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