The value of a for the Mark-Houwink equation reaches a theoretical maximum value of 2.0 for rigid rods.
Rigid rod polymers do not exhibit a glass transition, because their amorphous fraction is negligibly small.
Rigid rod polymers decompose before their melting temperature.
Rigid rod polymers include:
- aromatic polyamides
- polyheterocyclic polymers (PBT, PBO)
