Molecular Mobility of Molecular Brushes With a Polyimide Backbone and Polymethylmethacrylate Side Chains of Different Lengths
作者： Natalia Nikonorova , Tamara Meleshko , Dmitry Ilgach , Natalia Bogorad , Alexander Yakimansky
DOI: 10.1080/00222348.2013.808912
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摘要: The molecular mobility of polyimide (PI) brushes, i.e., graft-copolymers with a backbone and PMMA side chains different lengths, is studied by the dielectric spectroscopy method. Three dipolar polarization regions are found in temperature range from –150 to 200°C: β-, β1, α-processes. β-process due local polar groups PI glassy state. Ester polymethylmethacrylate (PMMA) responsible for two forms mobility: state (β1-process) cooperative segmental motion skeletons (α-process). parameters β- β1-processes weakly dependent on chain's length. For α-process, decreases increasing their
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