I have tried to quaternise P4VP and the mass residue increases from 0 to 12% at 750oC. I have tried to quaternise by chloroacetamide and confirmed it through FTIR and NMR
Aswin Arakkal it is extremely possible for mass residues in samples to increase, especially after their surface modification.
Surface modification is known to affect the chemical contents of materials and therefore deter its fire or thermal properties.
In your case, the modified polymer is more thermally stable, leaving more carbonaceous residues. this result is common in many modified samples compared to raw/unmodified samples.
Dear all, what is the counter ion of the quaternized polymer ? Possibly, it is not excluded even at high temperature. Thus it counts for residual mass increase. My Regards