期刊
MACROMOLECULES
卷 43, 期 21, 页码 9004-9013出版社
AMER CHEMICAL SOC
DOI: 10.1021/ma1020352
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资金
- National Science Foundation [DMR-0605627, DMR-0907139, DMR-0901180]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0907139] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0901180] Funding Source: National Science Foundation
The dynamics of intermolecularly hydrogen-bonded polymer blends of poly(p-(hexafluoro-2-hydroxy1-2-propyl)styrene) with poly(vinyl acetate), poly(ethylene[30]-co-vinyl acetate[70]) and poly(ethylene-[55]-co-vinyl acetate[45]) are investigated by broadband dielectric relaxation spectroscopy and Fourier transform infrared spectroscopy. Each blend component exhibits a glassy state (beta) relaxation, and these relaxations are affected by the formation of intermolecular associations. The glassy state behavior of the blends can be modeled using the Painter-Coleman association model. All blends exhibit a single T-g and a single dielectric segmental (alpha) relaxation, indicative of strong segmental-level coupling. The fragility of the glass-formers depends on the volume fraction of intermolecularly associated segments, and the association model predicts which compositions have the highest fragilities. A relaxation related to the breaking and reforming of hydrogen bonds is observed at temperatures above the a process, and its temperature dependence varies systematically with ethylene content.
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