Length Scales Which Perturb Chain Packing in Amorphous PolymersClick to copy article linkArticle link copied!
- Marcin Wachowicz
- Justyna Wolak
- Hanna Gracz
- Edward O. Stejskal
- Stefan Jurga
- Elizabeth F. McCord
- Jeffery L. White
Abstract
Direct spectroscopic probes of individual chain conformation and free volume are used to measure the increasing perturbation in the local glass-transition temperature of one polymer chain with decreasing length scale of mixing in binary polyolefin blends. Solid-state 2H and 129Xe NMR experiments reveal a compositional miscibility window in side-chain concentration for polyisobutylene (PIB)/poly(ethylene-co-butene) (PEB) blends. A combination of pulsed-field gradient and chemical shift data for xenon gas absorbed in these polymer blends indicates that the presence of polymer chains within a radius of ∼35 nm of a different chain structure will perturb the intermolecular packing contribution to the total conformational energy of that chain, thereby changing its Tg.
†
Department of Macromolecular Physics, Institute of Physics, Adam Mickiewicz University, ul. Umultowska 85, 61−614 Poznan, Poland.
‡
DuPont Central Research and Development, Experimental Station, Wilmington, DE.
*
To whom all correspondence should be addressed: e-mail [email protected].
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- Alan E. Tonelli, Jeffery L. White. NMR Spectroscopy of Polymers. 2007, 359-383. https://doi.org/10.1007/978-0-387-69002-5_20
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