Influence of fatty chain length and starch composition on structure and properties of fully substituted fatty acid starch esters.
A series of almost fully substituted Fatty Acid Starch Esters (FASEs) has been obtained in a homogeneous LiCl/DMAc medium by grafting octanoyl (C8), lauroyl (C12) and palmitoyl (C16) chlorides onto 3 starch species: Amylo-Maize, Potato and Waxy Maize. Structure-property relationships of FASEs are investigated as a function of both fatty acid chain length and amylose/amylopectin ratio of the starch. The structural study has revealed a layered type organization in which starch chain planes are separated by fatty chains. The latter are interpenetrated and/or tilted for FASE-C16 whatever the origin of the starch is, and fatty chains partially crystallizes into a structure with hexagonal symmetry. FASEs with C8 and C12 side chains are totally amorphous. The mechanical behavior of FASEs is shown to depend on both side chain length and amylose/amylopectin ratio, and an increase in material ductility is observed at increasing amylose content for C8 and C12 side chains.
Univ Lille Nord France, 59000 Lille, France; Unité Matériaux Et Transformations, UMR CNRS 8207, Université Lille 1, France.
Audrey
A
Vanmarcke
Univ Lille Nord France, 59000 Lille, France; Unité Matériaux Et Transformations, UMR CNRS 8207, Université Lille 1, France.
Lise
L
Leroy
Univ Lille Nord France, 59000 Lille, France; Unité Matériaux Et Transformations, UMR CNRS 8207, Université Lille 1, France.
Gregory
G
Stoclet
Univ Lille Nord France, 59000 Lille, France; UArtois, IUT Béthune, 62408 Béthune, France; IUT de Béthune, 1230 rue de l'Université, CS 20819, 62408 Béthune, France.
Lucie
L
Duchatel-Crépy
Univ Lille Nord France, 59000 Lille, France; Unité Matériaux Et Transformations, UMR CNRS 8207, Université Lille 1, France.
Jean-Marc
JM
Lefebvre
Univ Lille Nord France, 59000 Lille, France; UArtois, IUT Béthune, 62408 Béthune, France; IUT de Béthune, 1230 rue de l'Université, CS 20819, 62408 Béthune, France. Electronic address: nicolas.joly@univ-artois.fr.
Nicolas
N
Joly
Univ Lille Nord France, 59000 Lille, France; Unité Matériaux Et Transformations, UMR CNRS 8207, Université Lille 1, France. Electronic address: valerie.gaucher@univ-lille1.fr.
Valérie
V
Gaucher
Fatty acid starch ester (FASE); Layered type structure; Side-chain crystallinity; Structure-property relationships