I have a homopolymer with a number of OH groups upon the pendant group. Characterization using dynamic mechanical analysis (powder pockets) gives two Tgs. When i add water to the polymer and run the sample again, one of these peaks disappears, I believe indicating it was due to hydrogen bonding between the chains.
Has anyone observed this before, anyone know of any publications?
Hi Olivia,
I do not know any publication but I believe that polymerization of your homopolymer will result in a polymer with phase segregation: A hydrophobic part due to the main chain and a hydrophilic one due to the side chains (with OH groups). Then, you will be observing a Tg from each phase.
PAN (Polyacrylonitrile) shows two Tgs, but the intensity of tan (delta) depends on its crystallinity. Better reconfirm your 2 Tgs with other methods especially DSC .
- Badges
- Science topic
- Similar topics
- Biological Science
- Kinesiology
- Running