Structure-properties relationships in melt reprocessed PLA/hydrotalcites nanocomposites
| Autor: | F. P. La Mantia, Luigi Botta, Fiorenza Sutera, Maria Chiara Mistretta, Roberto Scaffaro |
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| Přispěvatelé: | Scaffaro, R., Sutera, F., Mistretta, M., Botta, L., La Mantia, F. |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Polymers and Plastics General Chemical Engineering Hydrotalcite 02 engineering and technology 010402 general chemistry lcsh:Chemical technology 01 natural sciences Nanocomposites Materials Chemistry lcsh:TA401-492 lcsh:TP1-1185 Recycling Physical and Theoretical Chemistry Hydrotalcites Nanocomposite Organic Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Chemical engineering PLA lcsh:Materials of engineering and construction. Mechanics of materials 0210 nano-technology Melt processing |
| Zdroj: | eXPRESS Polymer Letters, Vol 11, Iss 7, Pp 555-564 (2017) |
| Popis: | In this work the effect of multiple reprocessing was studied on molecular structure, morphology and properties of poly(lactic acid)/hydrotalcites (PLA/HT) nanocomposites compared to neat PLA. In addition, the influence of two different kinds of HT – organically modified (OM-HT) and unmodified (U-HT) – was evaluated. Thermo-mechanical degradation was induced by means of five subsequent extrusion cycles. The performance of the recycled materials was investigated by mechanical and rheological tests, differential scanning calorimetry (DSC), intrinsic viscosity measurements and SEM observation. The results indicated that the best morphology was achieved in the systems incorporating OM-HT. On increasing the extrusion reprocessing cycles, the properties showed behavior due to two opposite effects: i) chain scission due to thermo-mechanical degradation and ii) filler dispersion effect resulting from multiple processing. In particular, at low reprocessing cycles, both tensile and rheological properties seem to be mainly affected by HT dispersion, especially when OM-HT was added. After five reprocessing cycles, on the contrary, chain scission, i.e. thermo-mechanical degradation, dominated. As regards the effect of the presence of organic modifier in HT, the results indicated that this variable apparently did not affect the macroscopic performance of the nanocomposites, especially at high reprocessing cycles. |
| Databáze: | OpenAIRE |
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