Correlation between Structure and Vapor Sorption in Semicrystalline Linear Polyethylene: One Dimensional Nano-Swelling Measured Using in Situ Vapor Sorption Small Angle Neutron Scattering (iVSANS)
| Autor: | Man-Ho Kim, Charles J. Glinka |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Polymers and Plastics
Vapor pressure Diffusion Organic Chemistry technology industry and agriculture Analytical chemistry Mineralogy Sorption Spherulite (polymer physics) Polyethylene complex mixtures Small-angle neutron scattering eye diseases Inorganic Chemistry Linear low-density polyethylene chemistry.chemical_compound Crystallinity chemistry Materials Chemistry sense organs |
| Zdroj: | Macromolecules. 42:2618-2625 |
| ISSN: | 1520-5835 0024-9297 |
| Popis: | Changes in the nanoscale structure of semicrystalline polyethylene (PE) resulting from the sorption/diffusion of hexane-d14 vapor have been observed and quantified by in situ vapor sorption small-angle neutron scattering (iVSANS). We find a linear correlation between vapor sorption/diffusion and nanoexpansion of the amorphous phase within the lamellae confined in the spherulite domains. The expansion depends on the degree of crystallinity and spherulite perfection. We measured the structure-based sorption kinetics and isotherms of samples with two different crystalline volume fractions (ϕvc). The low crystalline polyethylene shows a larger expansion in the long period, L, than the high crystalline polyethylene. Low crystalline PE shows a Fickian-like diffusion profile with sorption time while the high crystalline PE (ϕvc = 78%) shows a S-shape diffusion profile (non-Fickian) at P/P° = 0.95. The diffusion coefficient increases with relative vapor pressure (P/P°) in both materials. The apparent diffusion co... |
| Databáze: | OpenAIRE |
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