Dynamic mechanical and thermal behavior of epoxy resins based on soybean oil |
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Authors: | Annelise E Gerbase Cesar L Petzhold Ana Paula O Costa |
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Affiliation: | (1) Instituto de Química, Universidade Federal do Rio Grande do Sul (UFRGS), CP 15003, 91501-970 Porto Alegre, RS, Brazil |
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Abstract: | Mechanical and thermal properties of materials prepared by curing epoxidized soybean oil with various cyclic acid anhydrides
in the presence of tertiary amines were investigated by dynamic mechanical thermal analysis and thermogravimetry. All samples
presented thermoset material characteristics that were dependent upon the type of anhydride, the anhydride/epoxy molar ratio,
and epoxy group content. The thermosets obtained from anhydrides with rigid structures as such phthalic, maleic, and hexahydrophthalic
showed higher glass transition temperatures (Tg) and cross-linking densities. As expected, the Tg decreased as the anhydride/epoxy
ratio decreased. The influence of the degree of epoxidation of soybean oil on the mechanical properties and Tg was also investigated.
It was found that the higher the epoxy group amount, the higher the Tg and hardness. Cured resins exhibited thermal stability
up to 300°C, except for those prepared with dodecenyl succinic anhydride, which began to decompose at lower temperature. They
presented excellent chemical resistance when immersed in 1% wt/vol NaOH and 3% wt/vol H2SO4 solutions but poor chemical resistance in the presence of organic solvents. |
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Keywords: | Chemical resistance dynamical mechanical properties epoxidized soybean oil epoxy resins thermogravimetric analysis thermosetting polymers |
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