کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5207101 | 1382335 | 2010 | 8 صفحه PDF | دانلود رایگان |

This paper describes the process of mixing carboxyl-terminated butadiene-acrylonitrile (CTBN) with nano-clay to improve the toughness and mechanical strength of bisphenol A type epoxy, which tends to exhibit brittle fracture behavior. For evaluation of the degradation by radiation, gamma rays of 500Â kGy, 1000Â kGy, and 1500Â kGy were used to irradiate the samples at a dose rate of 8Â kGy/hr. The molecular structure changes, inter-layer distance of the clay, morphology, and radiation degradation behavior of epoxy and CTBN of the gamma-ray irradiated samples were measured using a Fourier transform infrared spectrometer (FTIR), X-ray diffractometer (XRD), thermogravimetric analyzer (TGA), tensile machine and a field emission scanning electron microscope (FESEM). The FTIR results verified the band stretching of the -CN and the CO bonding in CTBN from the spectra of CTBN-modified epoxies. The XRD results verified the easy intercalation of clay added to the epoxy and CTBN. In the TGA experiment, as the absorption dose increased and the heating rate decreased, the thermogravimetry-derivative thermogravimetry (TG-DTG) curves of the samples rapidly decreased. As the absorption dose increased, the tensile strengths of all the degraded samples sharply decreased, and morphologies, which were rubber particles fractured by gamma rays, were observed by FESEM.
Journal: Polymer Testing - Volume 29, Issue 1, February 2010, Pages 139-146