Thermally stable exfoliated poly(ethylene terephthalate) (PET) nanocomposites as prepared by selective removal of organic modifiers of layered silicate
| Autor: | Sang-Wook Chun, Jae Woo Chung, Tae Jin Kang, Se-Bum Son, Seung-Yeop Kwak |
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| Rok vydání: | 2008 |
| Předmět: |
Thermogravimetric analysis
Materials science Nanocomposite Ethylene Polymers and Plastics Thermal decomposition Condensed Matter Physics law.invention chemistry.chemical_compound Differential scanning calorimetry Chemical engineering chemistry Mechanics of Materials law Transmission electron microscopy Polymer chemistry Materials Chemistry Thermal stability Crystallization |
| Zdroj: | Polymer Degradation and Stability. 93:252-259 |
| ISSN: | 0141-3910 |
| DOI: | 10.1016/j.polymdegradstab.2007.09.009 |
| Popis: | Exfoliated poly(ethylene terephthalate) (PET) nanocomposite excluding organic modifier (M-P et LSN eom ) was successfully prepared by the melt processing via solution method with solvent–nonsolvent system. PET nanocomposites including organic modifier (M-P et LSN iom and D-P et LSN) as counterpart of M-P et LSN eom were prepared by using the melt processing via solution method without solvent–nonsolvent system and the only conventional direct melt mixing process, respectively. From elemental analysis (EA) and thermogravimetric analysis (TGA), organic modifier in M-P et LSN eom was confirmed to be well removed by solution method with solvent–nonsolvent system. Then, it was found that M-P et LSN eom and M-P et LSN iom had exfoliated structure by wide angle X-ray diffraction (WAXD) and high-resolution transmission electron microscopy (HR-TEM), whereas no expansion of gallery height was observed for D-P et LSN. To elucidate the effect of organic modifier on the physical properties of PET nanocomposites, the crystallization behavior, optical transparency, thermal stability, and mechanical properties of M-P et LSN eom , M-P et LSN iom , D-P et LSN, and neat PET were evaluated by differential scanning calorimetry (DSC), UV–visible (UV–vis) spectroscopy, TGA, and universal testing machine (UTM). All of the PET nanocomposites exhibited faster crystallization kinetics and better thermal and mechanical properties compared to neat PET due to the presence of silicate layer in PET. However, M-P et LSN iom and D-P et LSN including organic modifier showed lower crystallization constant rates, longer crystallization half times, and poorer optical, thermal, and mechanical properties than M-P et LSN eom . These results were ascribed to the thermal decomposition of the organic modifiers presented in M-P et LSN iom and D-P et LSN during the melt processing. |
| Databáze: | OpenAIRE |
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