DOI: 10.1002/macp.202300177 ISSN:

Structure And Mechanical Behavior of Fully Substituted Acid Starch Esters

Adelina David, Grégory Stoclet, Nicolas Joly, Cédric Ribeiro, Nicolas Descamps, Denis Lourdin, Valérie Gaucher
  • Materials Chemistry
  • Organic Chemistry
  • Polymers and Plastics
  • Physical and Theoretical Chemistry
  • Condensed Matter Physics
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Abstract

This study deals with the evolution of structural, thermal and mechanical properties of a series of fully substituted fatty acid starch esters (FASE) according to side chain length (from C2 to C16). FASE 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 stronger 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 FASE (<C8) whereas for long chain starch ester from C8 to C16 length, an orientation of starch backbone in the drawing direction is observed.

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