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Unsaturated polyester resins based on itaconic acid and methyl methacrylate with vanadium containing initiation system

Authors: Rubeš David | Honzíček Jan | Vinklárek Jaromír

Year: 2022

Type of publication: ostatní - přednáška nebo poster

Page from-to: nestránkováno

Titles:

Language	Name	Abstract	Keywords
eng	Unsaturated polyester resins based on itaconic acid and methyl methacrylate with vanadium containing initiation system	The focus of this study was to find suitable unsaturated polyester resin free of styrene and cobalt-based initiation catalyst. Several polyesters were synthesized from, phthalic anhydride (Pa) and itaconic acid (IA) in a 1:1 ratio with various ratios of propylene glycol (Pg) and diethylene glycol (DEG). The synthesis was carried until an acid value of approximately 50 mg KOH/g was reached, which corresponds to an average molecular weight of around 1200 g/mol. This polyester was then diluted with methyl methacrylate (MMA) and other acrylates containing one, two or three free double bonds so that the reactive diluent would in total make up 30wt. % of the resin. The crosslinking of the resulting resin was then initiated with methyl ethyl ketone peroxide and vanadium-based catalyst at laboratory temperature. The degree of cross-linking was compared by the use of DMA, stress strain measurement determined ultimate tensile strength of 70.3 MPa for resin containing 1.4Pg:0,6DEG ratio and 28wt. % of MMA plus 2wt. % of EDMA (ethylene dimethacrylate). The maximum elongation at break of 12.3 % was achieved in a resin containing 1Pg:1DEG ratio and 20wt. % MMA plus 10wt. % MA (methyl acrylate). The highest impact toughness of 5.0kJ∙m–2 was obtained by Charpy test in a resin containing 1Pg:1DEG and 28wt. % MMA plus 2wt. % EDMA. The Young modulus ranged between 1.17 GPa and 2.65 GPa, and the glass transition temperature between 66°C and 86°.	Unsaturated polyester resin; itaconic acid; styrene-free; vanadium; acrylate reactive diluent