Dissertation/Thesis Abstract

Hygrothermal Aging of Benzoxazine and Benzoxazine Epoxy Systems
by Banuelos, Josecruz, M.Sc., California State University, Long Beach, 2020, 76; 27834321
Abstract (Summary)

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.

Indexing (document details)
Advisor: Barjasteh, Ehsan
Commitee: Lo, Roger, Moghtadernejad, Sara
School: California State University, Long Beach
Department: Chemical Engineering
School Location: United States -- California
Source: MAI 82/3(E), Masters Abstracts International
Source Type: DISSERTATION
Subjects: Materials science, Polymer chemistry
Keywords: Benzoxazine epoxy copolymers, Copolymerization, Hygrothermal aging
Publication Number: 27834321
ISBN: 9798664789904
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