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P. Penczek, J. Rejdych, B. Szczepaniak, A. Winiarska



Crosslinking as a result of cyclotrimerization of new resins with acetylenic bonds

Polimery 1998, No 1, 28


DOI: dx.doi.org/10.14314/polimery.1998.028


Summary

Cyclotrimerization of compounds containing at least two -CºC-bonds was studied. The compounds (I-A, I-B, III) were prepared by adding propargyl alcohol (2-propyn-l-ol) or 2-butyne-1,4-diol to polyepoxides, viz., glycidyl ethers of ethylene glycol, bisphenol A or o-cresol novolac. I-A, I-B and III were cyclotrimerized in the presence of complex cobalt or rhodium salts as catalysts. Reaction courses were followed by differential scanning calorimetry (DSC). A triphenylphosphine—rhodium(III) chloride complex, {Rh[Р(С6Н5)з]з}Сlз, was found to catalyze the reactions most efficiently. Satisfactory crosslinking was obtained only with III and the resulting product had a glass transition temperature (Tg ) of 93°C. A mixture of this product and an oxazolidone epoxy resin cured with phthalic anhydride gave a polymer with an interpenetrating network (IPN) structure, having a higher Tg (104°C) and a higher thermal stability, and exhibiting a TGA mass loss lower than that of any component crosslinked individually.


Keywords: cyclotrimerization reaction and catalysts, propargyl derivatives of polyepoxides, crosslinking, interpenetrating polymer networks, oxazolidone epoxy resin


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