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New biobased carboxylic acid hardeners for epoxy resins
Author(s) -
Jaillet Fanny,
Desroches Myriam,
Auvergne Rémi,
Boutevin Bernard,
Caillol Sylvain
Publication year - 2013
Publication title -
european journal of lipid science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.614
H-Index - 94
eISSN - 1438-9312
pISSN - 1438-7697
DOI - 10.1002/ejlt.201200363
Subject(s) - epoxy , thioglycolic acid , phthalate , soybean oil , materials science , curing (chemistry) , diglycidyl ether , differential scanning calorimetry , organic chemistry , thermogravimetry , polymer chemistry , epoxidized soybean oil , bisphenol a , chemical engineering , chemistry , raw material , physics , food science , thermodynamics , engineering
Soybean oil was modified into a novel biobased polyacid hardener by thiol‐ene coupling with thioglycolic acid. The structure of the initial soybean oil and polyacid triglyceride was carefully analyzed using 1 H NMR and titration. The thermal crosslinking reaction between acid hardener and epoxidized resin was studied by differential scanning calorimetry (DSC) and rheology. Then, the synthesized biobased acid hardener was employed as a novel curing agent for bisphenol A diglycidyl ether to elaborate new partially biobased materials. These materials, formulated in stoichiometry ratio, were characterized by DSC, thermogravimetry analyses, dynamic mechanical analyses and exhibit interesting properties for coatings. Practical applications: The products of the chemistry described in this contribution, i.e., polyacid from soybean oil and thioglycolic acid, provide biobased building blocks for further epoxy resin syntheses by reaction with epoxy groups. The obtained epoxy resins are partially biobased and may be applied as binders and coatings.