Scattering from Polymer Systems

Ruegg, Megan L.; Balsara, Nitash P.

doi:10.1002/9783527631421.ch37

Macromolecular Engineering 2007

DOI: 10.1002/9783527631421.ch37

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Scattering from Polymer Systems

Megan L. Ruegg

Nitash P. Balsara

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2016

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“…This could be due to contrast matching between the PS phase and the PEO + water phase. The scattering length density, Bi, for X-rays can be calculated using64…”

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confidence: 99%

Crystallite dissolution in PEO-based polymers induced by water sorption

Oparaji

Zuo

Hallinan

2016

Polymer

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Poly(styrene-block-ethylene oxide) (PS-b-PEO) is a model hierarchically nanostructured polymer that contains PEO crystallites within microphase segregated block copolymer morphology. In order to investigate dynamics in this hierarchically nanostructured polymer, water was used as a selective, interacting probe molecule. First, the equilibrium effect of water sorption on the polymer structure was examined. Then, the coupled dynamics of structural changes and water diffusion were studied. At moderate water activity, crystallite dissolution caused water diffusion to appear non-Fickian (determined by Fourier Transform infraredattenuated total reflectance spectroscopy). PEO deliquescence was so extreme at high water activity that dynamics could not be measured in a homopolymer control. In the block copolymer at unity water activity, a second stage of water sorption occurred that was attributed to relaxation of the glassy PS phase. Water desorption was ten times faster than sorption. Desorption is thought to be less hindered by tortuosity resulting from PEO crystallites. These results are of interest for a wide-range of applications including batteries and fuel cells, water desalination, food packaging, and biomedical implants.

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“…This could be due to contrast matching between the PS phase and the PEO + water phase. The scattering length density, Bi, for X-rays can be calculated using64…”

mentioning

confidence: 99%

Crystallite dissolution in PEO-based polymers induced by water sorption

Oparaji

Zuo

Hallinan

2016

Polymer

View full text Add to dashboard Cite

show abstract

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Scattering from Polymer Systems

Cited by 1 publication

References 25 publications

Crystallite dissolution in PEO-based polymers induced by water sorption

Crystallite dissolution in PEO-based polymers induced by water sorption

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