Manipulation of Crystallization Sequence in PEO-b-PCL Films Using Solvent Interactions
| Autor: | Kristi Allen, Allison Carandang, Christopher Nardi, Natasha Brigham, Ryan M. Van Horn |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Polymers and Plastics Nucleation Ethyl acetate 02 engineering and technology 010402 general chemistry 01 natural sciences law.invention Inorganic Chemistry chemistry.chemical_compound Optical microscope law Polymer chemistry Materials Chemistry Copolymer Crystallization chemistry.chemical_classification Ethylene oxide Organic Chemistry Polymer 021001 nanoscience & nanotechnology 0104 chemical sciences Solvent chemistry Chemical engineering 0210 nano-technology |
| Zdroj: | Macromolecules. 50:8996-9007 |
| ISSN: | 1520-5835 0024-9297 |
| Popis: | The physical structure of polymer films is important for understanding the observed macroscopic properties. In crystalline–crystalline block copolymers, the hierarchical nature of assembly is even more influential. Controlling this assembly process is crucial for tailoring film properties. In materials where crystallization of each block occurs nearly simultaneously, the ability to manipulate crystallization order is desirable. Poly(ethylene oxide)-b-poly(e-caprolactone) (PEO-b-PCL) films were monitored via ATR-FTIR to determine the crystallization order during drying from varying solvents. PCL crystallized first from most solvents except toluene and ethyl acetate, where PEO nucleation occurred first. Moreover, after melting the sample to remove solvent–polymer interaction effects, PCL was first to crystallize from the melt, as has been previously reported. Differences in the films’ morphologies based on crystallization order were observed using polarized optical microscopy. These results demonstrate that... |
| Databáze: | OpenAIRE |
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