title: Effect of chemical cross-linking on gelatin membrane solubility with a non-toxic and non-volatile agent: terephthalaldehyde.
abstract: In this paper, terephthalaldehyde (TPA) is proposed as non-toxic and non-volatile gelatin cross-linker. Optimal cross-linking parameters (TPA/gelatin ratio, temperature) were first determined from in situ rheological measurements on gelatin solutions and from chemical tests with 2,4,6-trinitrobenzenesulfonic acid (TNBS assays) on gelatin gel. The highest cross-linking ratio was achieved for a concentration of 0.005 g TPA/g gelatin at 60°C. The impact of TPA cross-linking on gelatin membrane functional properties (water swelling ratio, water vapor sorption and mechanical properties) was measured. TPA cross-linking increased 17 times the liquid water resistance duration of gelatin films, and delayed the entry of vapor water in the polymer matrix for 7 days, indicating that TPA increased the hydrophobic character of the gelatin matrix.
authors.affiliation: IEM (Institut Europeen des Membranes), UMR 5635 (CNRS-ENSCM-UM2), Universite Montpellier 2, Place E. Bataillon, F-34095 Montpellier, France.
authors.forename: Jennifer
authors.initials: J
authors.lastname: Biscarat
authors.affiliation: IEM (Institut Europeen des Membranes), UMR 5635 (CNRS-ENSCM-UM2), Universite Montpellier 2, Place E. Bataillon, F-34095 Montpellier, France.
authors.forename: Benjamin
authors.initials: B
authors.lastname: Galea
authors.affiliation: IEM (Institut Europeen des Membranes), UMR 5635 (CNRS-ENSCM-UM2), Universite Montpellier 2, Place E. Bataillon, F-34095 Montpellier, France.
authors.forename: José
authors.initials: J
authors.lastname: Sanchez
authors.affiliation: IEM (Institut Europeen des Membranes), UMR 5635 (CNRS-ENSCM-UM2), Universite Montpellier 2, Place E. Bataillon, F-34095 Montpellier, France. Electronic address: Celine.Pochat@univ-montp2.fr.
authors.forename: Celine
authors.initials: C
authors.lastname: Pochat-Bohatier
mesh_terms: D003432:Cross-Linking Reagents / Q000737:chemistry*; D005780:Gelatin / Q000737:chemistry*; D008422:Materials Testing; D015394:Molecular Structure; D012212:Rheology; D012995:Solubility; D013816:Thermodynamics
chemical_list: D003432:Cross-Linking Reagents; C015233:gelatin film; D005780:Gelatin
keywords: Cross-linking; Gelatin; Rheology; Terephthalaldehyde; Water solubility