Gamma Ray Irradiation‐Initiated Copolymerization of a Binary Casting System Involving DPBMI_n and Vinylpyrrolidone

Abstract

Summary: When initiated by gamma ray irradiation, a series of homogenous binary casting systems composed of bismaleimide oligomer DPBMIn with different chain length and reactive solvent vinylpyrrolidone were capable of copolymerization via radical mechanism to form copolymer resins with crosslinked network. Postcuring was performed by thermal treatment subsequent to gamma ray irradiation. The influences of irradiation dose, postcure, DPBMIn content, and chain length of DPBMIn on mechanical properties, water uptake, and thermal property of copolymer resins were investigated in details. Fracture morphologies of copolymer resins based on different DPBMIn were studied by SEM.

Biobased thermosetting resins composed of L‐lysine methyl ester and bismaleimide

“…[5][6][7][8][9] Petroleum-based thermosetting bismaleimide resins have been used as matrix resins for multilayer printed circuit boards and advanced composite materials in the aerospace industry. [10][11][12][13][14][15][16][17][18][19][20][21][22] Although 4,4 0 -bismaleimidodiphenylmethane (BMI) is exclusively used as a bismaleimide component in thermosetting bismaleimide resins, homopolymerized BMI is a very brittle material because of its high crosslinking density. To improve its brittleness, BMI is copolymerized with other components with two or more functional groups that can react with the maleimide groups.…”

“…Most recently, much focus has been placed on biobased thermosetting resins, such as epoxy resins, phenol resins, unsaturated polyester resins, and their composites, because these materials are hard to recycle because of their infusible and insoluble properties . Petroleum‐based thermosetting bismaleimide resins have been used as matrix resins for multilayer printed circuit boards and advanced composite materials in the aerospace industry . Although 4,4′‐bismaleimidodiphenylmethane (BMI) is exclusively used as a bismaleimide component in thermosetting bismaleimide resins, homopolymerized BMI is a very brittle material because of its high crosslinking density.…”

“…To improve its brittleness, BMI is copolymerized with other components with two or more functional groups that can react with the maleimide groups. The Kerimid and Compimide series are the most well‐known thermosetting bismaleimide resins; they were commercialized by Rhône‐Poulenc and Technochemie (now available from Evonik Industries), respectively. The monomers that were copolymerized with BMI for Kerimid and Compimide were 4,4′‐diaminodiphenylmethane (DDM) and 3‐aminobenzoic hydrazide (ABH), respectively.…”