Synthesis of Polysulfone-Containing Poly(butylene terephthalate) Segmented Block Copolymers: Influence of Segment Length on Thermomechanical Performance
| Autor: | Robert B. Moore, Nicholas G. Moon, Ryan J. Mondschein, Joseph M. Dennis, Gregory B. Fahs, Timothy Edward Long, Garth L. Wilkes |
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| Rok vydání: | 2017 |
| Předmět: |
Dimethyl terephthalate
Materials science Polymers and Plastics Organic Chemistry 02 engineering and technology Transesterification Nuclear magnetic resonance spectroscopy 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention Inorganic Chemistry chemistry.chemical_compound chemistry Chemical engineering law Polymer chemistry Materials Chemistry Copolymer Lamellar structure Polysulfone Crystallization Solubility 0210 nano-technology |
| Zdroj: | Macromolecules. 50:5107-5113 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/acs.macromol.7b00557 |
| Popis: | A facile synthesis of hydroxyethyl-functionalized poly(ether sulfone) (PESu) oligomers permitted subsequent melt transesterification into segmented block copolymers with poly(butylene terephthalate). The unique solubility of the PESu oligomers in the melt with 1,4-butanediol and dimethyl terephthalate enabled a systematic study of segment length on thermomechanical properties of the resulting block copolymers. 1H NMR spectroscopy revealed a compositional dependence on the average segment length of the PBT. Additionally, the concert of NMR spectroscopy, DSC, and DMA highlighted critical segment lengths for crystallization and phase separation. In agreement with a relatively constant Tm and phase separation observed with DSC and DMA, respectively, small-angle X-ray scattering identified a compositionally independent lamellar thickness, while the amorphous layer thickness increased with PESu incorporation. As a result, the complementary analytical techniques provided an understanding of the morphological inf... |
| Databáze: | OpenAIRE |
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