Abstract
In this letter, we report the first study of the molecular relaxation dynamics in the glass-rubber transition region in polyisobutylene by 2D correlation dielectric relaxation spectroscopy (2DC-DRS). With the help of the high resolution and high sensitivity of 2DC-DRS, it is also the first time to observe and locate the positions of the Rouse modes and sub-Rouse modes in type-B polymers in the dielectric spectrum. 2DC-DRS was also applied to compare the temperature dependences of different molecular motions. Moreover, 2DC-DRS has been demonstrated as a powerful tool for studying the molecular motions with different time/length scales.
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