PLA melt stabilization by high-surface-area graphite and carbon black
| Autor: | Gaetano Guerra, Luciana D'Urso, Roberto Pantani, Felice De Santis, Maria Rosaria Acocella, Valentina Iozzino |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Thermogravimetric analysis
Materials science Polymers and Plastics chemistry.chemical_element 02 engineering and technology 010402 general chemistry 01 natural sciences Article lcsh:QD241-441 lcsh:Organic chemistry Carbon black Poly(lactic acid) Graphite poly(lactic acid) carbon black graphite chemistry.chemical_classification Chemistry (all) General Chemistry Polymer 021001 nanoscience & nanotechnology Biodegradable polymer 0104 chemical sciences Polyester chemistry Chemical engineering Extrusion 0210 nano-technology Carbon |
| Zdroj: | Polymers Polymers, Vol 10, Iss 2, p 139 (2018) Polymers; Volume 10; Issue 2; Pages: 139 |
| Popis: | Small amounts of carbon nanofillers, specifically high-surface-area graphite (HSAG) and more effectively carbon black (CB), are able to solve the well-known problem of degradation (molecular weight reduction) during melt processing, for the most relevant biodegradable polymer, namely poly(lactic acid), PLA. This behavior is shown by rheological measurements (melt viscosity during extrusion experiments and time sweep-complex viscosity) combined with gel permeation chromatography (GPC) experiments. PLA’s molecular weight, which is heavily reduced during melt extrusion of the neat polymer, can remain essentially unaltered by simple compounding with only 0.1 wt % of CB. At temperatures close to polymer melting by compounding with graphitic fillers, the observed stabilization of PLA melt could be rationalized by scavenging traces of water, which reduces hydrolysis of polyester bonds. Thermogravimetric analyses (TGA) indicate that the same carbon fillers, on the contrary, slightly destabilize PLA toward decomposition reactions, leading to the loss of volatile byproducts, which occur at temperatures higher than 300 °C, i.e., far from melt processing conditions. |
| Databáze: | OpenAIRE |
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