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Influence of Isomerism on Thermal and Mechanical Properties of Aromatic Diamine Based Polybenzoxazines


Title: Influence of Isomerism on Thermal and Mechanical Properties of Aromatic Diamine Based Polybenzoxazines

Authors: Charles M. Davis, Trey J. Schneider, Isaac Fisher, Jeffrey S. Wiggins

DOI: 10.33599/nasampe/c.23.0150

Abstract: Polybenzoxazines are a class of thermoset network polymers that have gained significant interest as a matrix material for polymer matrix composites. Specifically, diamine based benzoxazines have shown promise as high temperature matrices for next generation composites. Despite the increasing number of papers reporting novel benzoxazine monomers and polymer properties, few have manufactured enough material to investigate their mechanical properties. Additionally, very little is known about the influence of polymer network architecture and isomerism on the tensile properties. Design of next generation polybenzoxazines requires a strong understanding of how molecular structure and isomerism influence both thermal and mechanical properties. This research aimed to determine the influence of isomerism on thermal and tensile properties of diamine based benzoxazines. Three isomeric benzoxazine monomers were synthesized and purified to ensure acurate characterization of monomer and polymer properties. Polymerization kinetics were characterized by DSCusing Flynn-Wall-Ozawa method. The Purified monomers were then cast into DMA and tensile coupons, and tested according to a modified ASTM D638. Results show that meta-substitution of amines leads to a 46 °C increase in glass transition temperature and 45 MPa decrease in tensile strength when compared to para-substituted isomer, likely due to meta-substitution leading to increased crosslink density of the network.

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Conference: CAMX 2023

Publication Date: 2023/10/30

SKU: TP23-0000000150

Pages: 8

Price: $16.00

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