PLA Melt Stabilization by High-Surface-Area Graphite and Carbon Black
AbstractSmall 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. View Full-Text
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D’Urso, L.; Acocella, M.R.; Guerra, G.; Iozzino, V.; De Santis, F.; Pantani, R. PLA Melt Stabilization by High-Surface-Area Graphite and Carbon Black. Polymers 2018, 10, 139.
D’Urso L, Acocella MR, Guerra G, Iozzino V, De Santis F, Pantani R. PLA Melt Stabilization by High-Surface-Area Graphite and Carbon Black. Polymers. 2018; 10(2):139.Chicago/Turabian Style
D’Urso, Luciana; Acocella, Maria R.; Guerra, Gaetano; Iozzino, Valentina; De Santis, Felice; Pantani, Roberto. 2018. "PLA Melt Stabilization by High-Surface-Area Graphite and Carbon Black." Polymers 10, no. 2: 139.
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