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Dynamic mechanical and thermal behavior of epoxy resins based on soybean oil
Author(s) -
Gerbase Annelise E.,
Petzhold Cesar L.,
Costa Ana Paula O.
Publication year - 2002
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/s11746-002-0561-z
Subject(s) - epoxy , phthalic anhydride , succinic anhydride , thermosetting polymer , maleic anhydride , materials science , thermogravimetry , glass transition , epoxidized soybean oil , soybean oil , thermal stability , chemical resistance , curing (chemistry) , dynamic mechanical analysis , chemical modification , composite material , polymer chemistry , organic chemistry , chemical engineering , chemistry , polymer , copolymer , raw material , food science , catalysis , engineering
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 H 2 SO 4 solutions but poor chemical resistance in the presence of organic solvents.