Properties and Curing Kinetics of a Processable Binary Benzoxazine Blend.

Authors :: Tang Y
Symons HE
Gobbo P
Van Duijneveldt JS
Hamerton I
Rochat S
Source :: ACS applied polymer materials [ACS Appl Polym Mater] 2023 Nov 15; Vol. 5 (12), pp. 10404-10415. Date of Electronic Publication: 2023 Nov 15 (Print Publication: 2023).
Publication Year :: 2023
Abstract: A benzoxazine system is presented combining liquid cardanol-based benzoxazine (CA-a) and an effective initiator (3,3'-thiodipropionic acid, TDA) to bisphenol A-based benzoxazine (BA-a). The resultant mixture of monomeric precursors shows excellent fluidity and a relatively low peak polymerization temperature of around 200 °C. Moreover, the cured polybenzoxazine displays a high thermal decomposition temperature ( T <subscript>d,5%</subscript> > 330 °C), a moderately high glass transition temperature (∼148 °C), and robust mechanical strength (storage modulus ∼ 2.8 GPa) comparable to those of the polybenzoxazine homopolymer obtained by curing BA-a. A comprehensive investigation into the microstructure and curing kinetics has also been conducted on the system, offering an extensive background for future studies.<br />Competing Interests: The authors declare no competing financial interest.<br /> (© 2023 The Authors. Published by American Chemical Society.)