Copolymers derived from bismaleimide oligomer with active solvent

Abstract

An oligomer from 4, 4Ј-bis(maleimido)diphenyl methane and methylenedianiline were dissolved in active solvent N,N-dimethyl acrylamide in a solid content up to 50 -70%; the solution was poured in a sheet-shaped module and irradiated by 60 Co with the dose from 20 to 350 kGy at room temperature. The polymerized sheet was postcured at 180°C to obtain a transparent red-orange sheet with tensile strength above 100 MPa. The glass transition temperature before and after postcuring was around 100°C and 150 -180°C, respectively. Styrene was used along with DMAA to decrease the water absorption for the copolymers.

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

“…In this way, the thus modified BMIs with extended chain exhibited improved solubility and lowered degree of crosslink after cure 8–11. Making use of these improvements, easier processability coupled with desired mechanical strength could be expected 12…”

“…[8][9][10][11] Making use of these improvements, easier processability coupled with desired mechanical strength could be expected. [12] .…”

“…[13] Recently some researches were conducted on polyimide related to gamma ray irradiation. [12,14] In this paper, a series of homogeneous binary casting systems composed of bismaleimide oligomer DPBMI n and vinylpyrrolidone (NVP) as reactive solvent were developed. Because of increased solubility of DPBMI n , the system involving DPBMI n and NVP was an optically transparent homogeneous solution even at high DPBMI n content, such as 50 wt.-%.…”

“…Recently, E‐beam was used to cure bismaleimide‐reactive diluent resin for many advantages of irradiation cure over conventional thermal cure 13. Recently some researches were conducted on polyimide related to gamma ray irradiation 12,14. In this paper, a series of homogeneous binary casting systems composed of bismaleimide oligomer DPBMI n and vinylpyrrolidone (NVP) as reactive solvent were developed.…”

Effects of ⁶⁰Co-Irradiation on Tensile Properties of Polyimide Based on 2,2-Bis(3-amino-4-hydroxyphenyl)hexafluoropropane

“…By inducing active monomer, crosslinking reaction could occur under certain conditions, so that the properties of polyimides were improved. [6][7][8] The main purpose of these studies was to investigate radiation stability of polyimides. It was proved that polyimides exhibit high radiation resistance; however, the mechanical properties of polyimides decreased at high irradiation dose.…”