This title appears in the Scientific Report :
2012
Please use the identifier:
http://dx.doi.org/10.1021/ma3004136 in citations.
Stepwise Swelling of a Thin JFilm of Lamellae-Forming Poly(styrene-b-butadiene) in Cyclohexane Vapor
Stepwise Swelling of a Thin JFilm of Lamellae-Forming Poly(styrene-b-butadiene) in Cyclohexane Vapor
We investigated the swelling of a thin film of lamellae-forming poly(styrene-b-butadiene) in cyclohexane vapor. The vapor pressure and thus the degree of swelling of the film are increased in a stepwise manner using a custom-built sample cell. The resulting structural changes during and after each s...
Saved in:
Personal Name(s): | Di, Z. |
---|---|
Posselt, D. / Smilgies, D.-M. / Li, R. / Rauscher, M. / Potemkin, I.I. / Papadakis, C.M. | |
Contributing Institute: |
Neutronenstreuung; ICS-1 Neutronenstreuung; JCNS-1 JCNS-FRM-II; JCNS-FRM-II |
Published in: | Macromolecules, 45 (2012) S. 5185 - 5195 |
Imprint: |
Washington, DC
Soc.
2012
|
Physical Description: |
5185 - 5195 |
DOI: |
10.1021/ma3004136 |
Document Type: |
Journal Article |
Research Program: |
In-house Research with PNI BioSoft: Makromolekulare Systeme und biologische Informationsverarbeitung |
Series Title: |
Macromolecules
45 |
Subject (ZB): | |
Publikationsportal JuSER |
We investigated the swelling of a thin film of lamellae-forming poly(styrene-b-butadiene) in cyclohexane vapor. The vapor pressure and thus the degree of swelling of the film are increased in a stepwise manner using a custom-built sample cell. The resulting structural changes during and after each step were followed in situ using time-resolved grazing-incidence small-angle X-ray scattering (GISAXS). During the first step, the lamellar thickness increases strongly, before it decreases again. At the same time, the full width at half-maximum (FWHM) of the diffuse Bragg reflection along the film normal has a sharp maximum. These observations point to the formation of new lamellae. During the subsequent swelling steps, the lamellar thickness overshoots only weakly. The behavior thus resembles qualitatively our previous results on a similar thin film during swelling in saturated vapor of cyclohexane; however, it deviates from earlier theoretical predictions. We propose a theory that is quantitatively correct for the description of the dependence of the lamellar thickness on the polymer volume fraction in the late stage of the swelling steps. |