期刊
JOURNAL OF APPLIED POLYMER SCIENCE
卷 124, 期 5, 页码 4346-4351出版社
WILEY
DOI: 10.1002/app.35417
关键词
resin; microstructure; mechanical property; dielectric property; modification
资金
- National Science Foundation of China [51073180]
- China Postdoctoral Science Foundation [20070421113, 200801434]
- Shaanxi Provincial Education Commission [2010JK694]
- The Scientific Research Foundation of Xi'an University of Science and Technology [2009017, 2010019, 2010QDJ035]
In the present study, hydroxyl-terminated polybutadiene (HTPB) liquid rubber was employed to modify epoxy resin using 2,4,6-tri (dimethylaminomethyl) phenol as a catalyst, and methyl hexahydrophthalic anhydride as a curing agent. The reactions between HTPB and epoxy were monitored by Fourier transform infrared (FTIR); the mechanical and dielectric properties of HTPB modified epoxies were evaluated and the morphology was investigated through scanning electronic microscopy (SEM). The FTIR analysis evidenced the occurrence of a chemical reaction between the two components. The mechanical results indicated that the impact strength of HTPB-modified epoxy was superior to that of the pure epoxy. As the HTPB content increased up to 10 phr the best mechanical performances in terms of tensile and flexural properties were achieved when compared to the unmodified epoxy. Higher concentration of HTPB resulted in larger particles and gave lower mechanical strength values. The incorporation of HTPB into epoxy decreased the dielectric constant and dissipation factor over a wide frequency range from 1 to 106 Hz, and improved the electrical resistivity. SEM micrographs showed that the modified epoxy exhibited a two-phase morphology where the spherical rubber domains were dispersed in the epoxy matrix. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
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