Recently a series of bio-based epoxies (DGEDP) derived from diphenolic acid as alternative to the diglycidyl ether of bisphenol-A (DGEBA) have been synthesized. DGEDP epoxies with different n-alkyl side chain lengths have been modified for particular use in composites, adhesives and coatings.<br/>For fiber reinforced composites an appropriate DGEDP was mixed with a bio-based reactive diluent (glycidyl ether of eugenol) in order to decrease system viscosity and increase gelation time without affecting overall mechanical properties.<br/>In the case of adhesives, surface energy, failure mechanisms as well as curing kinetics play a dominant role. DGEDP epoxy blended with a cashew nut shell liquid toughened epoxy resin (CNSL) was formulated for very fast curing times.<br/>DGEDP with thermoplastic polyurethane (TPU) was formulated to obtain toughened self-healing coatings with excellent transparency. TPU prepolymer was incorporated within the epoxy monomer to optimize crystallization kinetics and the processing window for the resultant coating.

Tailoring bio-based epoxies for various applications

254th National Meeting (2017)

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