On the strain-induced structural evolution of Poly(ethylene-2,5-furanoate) upon uniaxial stretching: An in-situ SAXS-WAXS study
| Autor: | S. De Vos, G. Gobius Du Sart, Bahar Yeniad, Jean-Marc Lefebvre, Grégory Stoclet |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Polymers and Plastics Crazing Small-angle X-ray scattering Organic Chemistry 02 engineering and technology Polyethylene 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention Amorphous solid Polyester chemistry.chemical_compound Chemical engineering chemistry law Phase (matter) Materials Chemistry Fiber Crystallization 0210 nano-technology |
| Zdroj: | Polymer. 134:227-241 |
| ISSN: | 0032-3861 |
| DOI: | 10.1016/j.polymer.2017.11.071 |
| Popis: | Among “green” alternatives for oil-based commodity plastics like Polyethylene, Polyamides, and Poly(Ethylene Terephthalate) (PET), a new class of polyesters synthesized from furanedicarboxylic acids (FDCAs) is currently in the spotlight of both the academic and industrial communities. Of particular interest is Poly(Ethylene-2,5-Furanoate) (PEF), which can be synthesized from biobased monomers. Owing to its physical properties, PEF qualifies as a strong candidate for PET substitution particularly in bottle, fiber and film packaging applications. In the present study the structural evolution of PEF upon uniaxial stretching has been investigated by means of in-situ Wide Angle and Small Angle X-ray Scattering experiments. At room temperature, initially un-oriented amorphous PEF exhibits brittle behavior in relation to its ability to deform by crazing. The mechanical behavior of PEF as a function of temperature is quite similar to the one observed in the case of oil-based aromatic polyesters like PET or Poly(Ethylene Naphtalate) (PEN). However, the processing range where a strain-hardening phenomenon occurs, caused by strain-induced crystallization is clearly more narrow in PEF. As a main result of this work, characterization of the structure induced upon stretching PEF provided evidence for the formation of a mesomorphic phase at low stretching temperatures. This transient phase is characterized by the presence of a meridional diffraction peak at low Bragg Angles. Under appropriate drawing conditions, strain-induced crystallization occurs, although quantitatively to a lesser extent than is established for PET. Examination of the crystalline structure of this strain-induced phase revealed that it differs from the thermally induced one. This has been ascribed to the fact that the macromolecules crystallize in an extended conformation upon drawing. |
| Databáze: | OpenAIRE |
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