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Properties of epoxy nanoclay system based on diaminodiphenyl sulfone and diglycidyl ether of bisphenol f: influence of post cure and structure of amine and epoxy

Ingram, S.E. and Liggat, J.J. and Pethrick, R.A. (2007) Properties of epoxy nanoclay system based on diaminodiphenyl sulfone and diglycidyl ether of bisphenol f: influence of post cure and structure of amine and epoxy. Polymer International, 56 (8). pp. 1029-1034.

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Abstract

Materials were prepared with Cloisite 30B, diglycidyl ether of bisphenol F and diaminodiphenyl sulfone (DDS) to investigate the relationship between exfoliation and property enhancement. A higher level of exfoliation was found with 4,4-DDS than in the material cured with 3,3-DDS. The material with 4,4-DDS that exhibited a higher degree of exfoliation also resulted in larger improvements in physical properties with nanoclay. Increasing the ratio of trifunctional to difunctional epoxy led to a significant decrease in the level of clay dispersion. Increasing the ratio of trifunctional epoxy in the nanocomposite also caused a decrease in Tg with the addition of nanoclay. However, an increase in Tg with increasing clay loadings was detected in samples with a higher degree of exfoliation, with only difunctional epoxy. Similar behaviour was found for samples with and without a post cure. Excessive post cure led to a decrease in thermal stability in Cloisite 30B-containing samples.