Preparation and Characterization of Poly(Lactic Acid)-g-Maleic Anhydride + Starch Blends

Poly(lactic acid) (PLA) and starch copolymers are obtained by reactive blending - varying the starch compositions from 0 to 60%. PLA is functionalized with maleic anhydride (MA), obtaining PLA-g-MA copolymers using dicumyl peroxide as an initiator of grafting in order to improve the compatibility an...

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Veröffentlicht in:Macromolecular symposia 2009-02, Vol.277 (1), p.69-80
Hauptverfasser: Orozco, Victor H, Brostow, Witold, Chonkaew, Wunpen, López, Betty L
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Sprache:eng
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Zusammenfassung:Poly(lactic acid) (PLA) and starch copolymers are obtained by reactive blending - varying the starch compositions from 0 to 60%. PLA is functionalized with maleic anhydride (MA), obtaining PLA-g-MA copolymers using dicumyl peroxide as an initiator of grafting in order to improve the compatibility and interfacial adhesion between the constituents. PLA + starch blends without a compatibilizer do not have sufficient interfacial adhesion. Decomposition temperature of PLA is not affected by grafting. Glass transition temperatures and dynamic mechanical properties are affected since MA has a plasticizing effect. Along with an increasing starch content friction decreases while wear loss volume in pin-on-disk tribometry has a minimum at nominal 15% wt. starch but increases at higher starch concentrations. The residual depth in scratching and sliding wear testing has a maximum at 15% starch; there is a minimum of storage modulus E' determined in dynamic mechanical testing at the same concentration. Microhardness results also reflect the plasticization by MA.
ISSN:1022-1360
1521-3900
DOI:10.1002/masy.200950309