期刊
JOURNAL OF APPLIED POLYMER SCIENCE
卷 132, 期 8, 页码 -出版社
WILEY
DOI: 10.1002/app.41503
关键词
glass transition; mechanical properties; properties and characterization; resins; thermosets
资金
- US Army Research Laboratory under the Army Materials Center of Excellence Program [W911NF-06-2-0013]
- Oak Ridge Institute for Science and Education
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.
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