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.
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