Journal
MACROMOLECULES
Volume 51, Issue 21, Pages 8561-8573Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.macromol.8b01210
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Funding
- NSF Polymer program [DMR-1408811]
- Alexander von Humboldt Foundation
- U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Science & Engineering Division
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Broadband dielectric spectroscopy, differential scanning calorimetry, and rheology were employed to study the impact of hydrogen (H)-bonding end-groups on segmental and chain dynamics of telechelic polypropylene glycol (PPG) and poly(dimethylsiloxane) (PDMS). Polymer chains with three types of H-bonding end-groups possessing different interaction strengths and a non-H-bonding end-group as reference were compared. The glass transition temperature (T-g) of H-bonding PPG systems with low molecular weight increases compared to the reference, and the T-g difference varies with chain-end interaction strength. In contrast, their shear viscosities (for T-g-scaled temperature, i.e., when the shift in T-g is accounted for) are similar to that one of the reference. This is in strong contrast to the behavior of telechelic PDMS with the same set of end groups, where the T-g increase of all H-bonding systems is independent of H-bond strengths, while shear viscosity increases significantly only for the strongest H-bonding end-groups. These observations are explained by the difference in lifetime of the end-group associations relative to segmental and chain relaxation times.
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