Journal of Membrane Science and Research 2022: Molecular mobiluty of Polynorbornenes with Trimethylsiloxyxilyl side groups: Influence of the polymerization mechanism
Dielectric and calorimetric studies on metathesis and addition-type polytricyclononenes, both based on the same monomer bearing three pendant -OSiMe3 groups, are reported.
• For the addition-type polymer, dielectric spectroscopy reveals a ß*-process related to the microporosity, whereas for its metathesis counterpart, the segmental dynamics (α-process) manifests.
• A significant conductivity contribution is detected for both samples which for the microporous addition-type polymer is three orders of magnitude greater than for the metathesis polymer.
• The calorimetric methods detected the glass transition for the metathesis polymer in agreement with the observed dielectric α-process.
• The discussed results reflect significant differences in molecular mobility of the two polymers affecting the appearance of microporosity which strongly determines the gas transport properties.Learn more in Journal of Membrane Science and Research 2022