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Thursday, February 28 • 10:30am - 11:00am
Influence of Continuous Reactor B-Staging on Rheological and Thermomechanical Behavior of a Benzoxazine Matrix - Western Washington University

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Abstract
Influence of Continuous Reactor B-Staging on Rheological and Thermomechanical Behavior of a Benzoxazine Matrix

Co-authors: Cecile Grubb, and John Misasi

The use of benzoxazine resin as a matrix in aerospace composite prepreg applications is desirable due to its inherent flame retardance and relatively low cost.  Prepreg performance properties before cure, such as matrix volume fraction, flow, and tack, are driven by the matrix prepolymer and are highly dependent on its level of conversion, or b-stage, as this impacts the viscosity during pre-impregnation.  This research sought to determine the impact of processing technique on matrix properties by comparing two b-staging methods: a traditional batch process and a continuous process using a twin-screw extruder.  The enthalpy of reaction and glass transition temperature were determined via differential scanning calorimetry and used to quantify the level of prepolymer b-stage from each process.  Prepolymer b-stage was then related to flow properties through study of viscosity profiles and gel points via parallel plate rheometry.  Finally, the effects of processing were analyzed in terms of cured thermomechanical behavior using dynamic mechanical analysis.  Significant reductions in the time to conversion were observed in materials processed using the continuous reactor.  Comparable rheological and thermomechanical properties were observed in material produced via both b-staging methods.

Speakers
avatar for Lina Ghanbari

Lina Ghanbari

Undergraduate Student, Western Washington University
Lina is a senior in the Plastics and Composites Engineering program at Western Washington University. She intends to go to graduate school to further pursue her education studying polymer science. Her research over the past three years has focused on the development of materials and... Read More →



Thursday February 28, 2019 10:30am - 11:00am CST
Astor Grand Ballroom C - 2nd Floor

Attendees (6)