AGEING OF SOLID STATE PHOTOCROSSLINKED STARCH BASED FILMS

J. Delville1, C. Joly2, P. Dole2, C. Bliard1

1 Laboratoire de Pharmacognosie - U MR 6013 URCA/CNRS – Bât 18 B.P : 1039 51687 Reims cedex 2, France

2 Equipe EMOI, UMR 614 URCA/INRA FARE – Bât 18 – B.P : 1039 51687 Reims cedex 2, France

* Corresponding author. E-mail: catherine.joly@univ-reims.fr

Received : 15 February 2003 ; revised version accepted : 01 June 2003

Abstract

A new family of crosslinked starch was synthesised in the solid state by UV irradiation without the use of any crosslinking agent. The original photosensitiser used was sodium benzoate. Although the final crosslinking density is relatively low, it is still sufficient to render starch nearly insoluble and to modify the "ageing" behaviour. Physical ageing (at T<Tg) is only slightly affected by the crosslinking bonds whereas recristallisation (also called retrogradation) is highly modified.

Keywords : Starch; Crosslink; UV irradiation; Sodium benzoate; Ageing.

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