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Castor-oil-modified epoxy resins as model systems of rubber-modified thermosets. 3: Use of nucleating agent to modify the particle-size distribution

✍ Scribed by Roxana A. Ruseckaite; Diana P. Fasce; Roberto J. J. Williams

Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
345 KB
Volume
30
Category
Article
ISSN
0959-8103

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✦ Synopsis

Abstract

Phase separation during polymerization was produced in a model system consisting of a diepoxide based on the diglycidyl ether of bisphenol A (DGEBA), ethylenediamine (EDA), and a 15% mass fraction of either pure castor oil (CO) or a 95:5 mass ratio of CO and a polyester (PE) based on CO and oxalic acid. PE acted as a nucleating agent, leading to a significant decrease in the concentration of dispersed‐phase particles and the appearance of a fraction of large particles. Unimodal particle‐size distributions turned into bimodal distributions when adding PE, but the total volume fraction of dispersed phase remained constant. The addition of nucleating agents may be useful to develop formulations with optimum particle‐size distributions for toughening purposes.

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