What are alpha and beta relaxation, seen in polymeric materials (observed in dielectric studies)? I wanted to know the physical origin and the way to identify them in dielectric spectra.
Dear Vipin Cyriac, these are types of local segmental motions each related to a special sequence of repeating units along and by side of the main chain backbone. They are detected in amorphous (co)polymer (and blends) in the range of the glass transition temperature Tg. Please have a look at the following links. My Regards
https://www.researchgate.net/publication/231693638_Dielectric_a-_and_b-Relaxations_in_Uncured_Styrene_Butadiene_Rubber
https://doi.org/10.1063/1.5009442
https://doi.org/10.1021/ma00109a025
https://doi.org/10.1002/polb.21064
Dear Vipin Cyriac . See the following useful link: https://chem.utk.edu/wp-content/uploads/2020/03/PhysChem-of-Polymers-parts-7.pdf
Kindly check also the following useful RG link: Article Relationship between the α‐ and β‐relaxation processes in am...
Also check please the following useful RG link: Chapter Relaxations in Polymers