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Development of biodegradable flexible films of starch and poly(lactic acid) plasticized with adipate or citrate esters.

Carbohydrate polymers (2012-12-12)
M A Shirai, M V E Grossmann, S Mali, F Yamashita, P S Garcia, C M O Müller
ABSTRACT

Biodegradable films were produced from blends contained a high amount of thermoplastic starch (TPS) and poly(lactic acid) (PLA) plasticized with different adipate or citrate esters. It was not possible to obtain pellets for the production of films using only glycerol as a plasticizer. The plasticization of the PLA with the esters and mixture stages added through extrusion was critical to achieve a blend capable of producing films by blow extrusion. Adipate esters were the most effective plasticizers because they interacted best with the PLA and yielded films with appropriate mechanical properties.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Diisodecyl adipate, technical grade
Sigma-Aldrich
Adipic acid, ≥99.5%
Sigma-Aldrich
Adipic acid, 99%
Sigma-Aldrich
Adipic acid, BioXtra, ≥99.5% (HPLC)
Supelco
Adipic acid, certified reference material, TraceCERT®