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Tunable and Durable Toughening of Polylactide Materials Via Reactive Extrusion
Ist Teil von
Macromolecular materials and engineering, 2014-05, Vol.299 (5), p.583-595
Ort / Verlag
Weinheim: Blackwell Publishing Ltd
Erscheinungsjahr
2014
Link zum Volltext
Quelle
Wiley Online Library
Beschreibungen/Notizen
To tune the toughness of PLA, a novel pathway to chemically modify PLA via reactive extrusion in the presence of “reactive” PEG derivatives is proposed. PEG methyl ether methacrylate (MAPEG) and PEG methyl ether acrylate (AcrylPEG) are melt‐mixed and extruded with PLA in the presence of 2,5‐dimethyl‐2,5‐di(tert‐butylperoxy)hexane (L101) as a free‐radical initiator. Molecular characterization reveals that about 20 and 65%, respectively, of the initially introduced MAPEG and AcrylPEG can be grafted onto the PLA backbone. The plasticization effect is demonstrated by a significant decrease of the glass transition temperature and storage modulus together with a significant increase of the elongation at break as compared to neat PLA.
In situ grafting of methacryl‐ and acryl‐functionalized PEG co‐monomers (MAPEG and AcrylPEG) onto PLA via reactive extrusion in the presence of peroxide is studied. As compared to conventional plasticization, the reactive grafting of plasticizers allows improving the impact resistance of the materials while conserving the plasticized blend flexibility.