Structure and Mechanical Behavior of Fully Substituted Acid Starch Esters

This study deals with the evolution of structural, thermal, and mechanical properties of a series of fully substituted fatty acid starch esters (FASEs) according to side chain length (from 2 (C2) up to 16 (C16) Carbons). FASEs with C2 to C12 side chains are fully amorphous with a glass transition temperature depending on chain length while in the case of FASE with C16 side chains, a part of side chains is able to crystallize. Thermomechanical behavior depends strongly on both the alkyl chain length and crystallinity of samples. In particular, for FASE-C16, the presence of crystals leads to a brittle behavior. During stretching, no macromolecular orientation is evidenced for short-chain FASEs (更多