Logo image
Back
Epoxy-Amine Networks with Varying Epoxy Polydispersity
Journal article   Peer reviewed

Epoxy-Amine Networks with Varying Epoxy Polydispersity

Ian M. Mc Aninch, Giuseppe R. Palmese, Joseph L. Lenhart and John J. La Scala
Journal of applied polymer science, v 132(8), pp np-n/a
20 Feb 2015
DOI: https://doi.org/10.1002/app.41503

Abstract

Physical Sciences Polymer Science Science & Technology
Solid, high molecular weight DGEBA-based epoxies were blended with high purity liquid DGEBA to create several resins with equivalent epoxy equivalent weights, but with polydispersity indices (PDIs) ranging from 3 to over 10. The resins were cured with a stoichiometric amount of polyetheramine and compared to a nonblended epoxy with PDI of 1.8. Modulus, glass transition temperatures, and molecular weight between cross-links were measured using dynamic mechanical analysis. Coefficients of thermal expansion (CTE) were measured and used to extend room temperature density measurements as a function of temperature. Fracture properties were also measured. Overall, the increased polydispersity has almost negligible effect, with the main difference occurring in the slope of the glassy CTE, with more polydisperse epoxies having a slower increase in CTE. In comparison to previous work where bimodal amines were blended with DGEBA, we conclude that epoxy resins are far more sensitive to distributions in the flexible portion, rather than the more rigid one. (c) 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41503.

Metrics

8 Record Views
13 citations in Web of Science
11 citations in Scopus

Details

InCites Highlights

Data related to this publication, from InCites Benchmarking & Analytics tool:

Collaboration types
Domestic collaboration
Web of Science research areas
Polymer Science
Logo image