Benzoxazine resin can be copolymerized with low-viscosity epoxy resin to create a processable system with superior thermal properties upon cure. In this study the hygrothermal aging of Benzoxazine-Epoxy copolymers were investigated. The moisture sorption-desorption behaviors of the bisphenol A-based benzoxazine (BZ - a) copolymerized with various bi-functional epoxies were studied by aging the specimens in water bath at: 50 oC, 70 oC and 90 oC. The effects of moisture on the change in the physical, thermal, and mechanical properties of the copolymer systems were investigated by thermo-gravimetric analysis, dynamic mechanical analysis (DMA), and Fourier Transform Infrared Spectroscopy (FTIR), respectively. Results showed that the choice of epoxy affected mass adsorption and viscoelastic response of the specimen during exposure. No direct correlation was observed between the Tg and the amount of absorbed water. The results show that pure Benzoxazines adsorb less moisture than either of the Benzoxazine Epoxy copolymers, even though it has the lowest Tg.
|Commitee:||Lo, Roger, Moghtadernejad, Sara|
|School:||California State University, Long Beach|
|School Location:||United States -- California|
|Source:||MAI 82/3(E), Masters Abstracts International|
|Subjects:||Materials science, Polymer chemistry|
|Keywords:||Benzoxazine epoxy copolymers, Copolymerization, Hygrothermal aging|
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