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Experimental and modeling studies on the synthesis and properties of higher fatty esters of corn starch
Authors
Aburto
Aburto
+23 more
Aburto
Aburto
Aburto
Ashby
Bastioli
Day
de Graaf
de Graaf
Dicke
Ehrenstein
Hernandez
Junistia
Laignel
Marsden
Montgomery
Mormann
Mullen
Mullen
Otey
Sagar
Stevens
Thiebaud
Wang
Publication date
1 January 2009
Publisher
Doi
Abstract
This paper describes a systematic study on the synthesis of higher fatty esters of corn starch (starch laurate and starch stéarate) by using the corresponding vinyl esters. The reactions were carried out in DMSO using basic catalysts (Na2HPO4, K2CO3, and Naacetate). The effect of the process variables (vinyl ester to starch ratio, catalyst intake, reaction temperature and type of the catalyst) on the degree of substitution (DS) of the starch laurate and starch stearate esters was determined by performing a total of 54 experiments. The results were adequately modeled using a non-linear multivariable regression model (R2≥0. 96). The basicity of the catalyst and the reaction temperature have the highest impact on the product DS. The thermal and mechanical properties of some representative product samples were determined. High-DS products (DS = 2.26-2.39) are totally amorphous whereas the low-DS ones (DS = 1.45-1.75) are still partially crystalline. The thermal stability of the esterlfied products is higher than that of native starch. Mechanical tests show that the products have a tensile strength (stress at break) between 2.7-3.5 MPa, elongation at break of 3-26%, and modulus of elasticity of 46-113 MPa.
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